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clk: microchip: Add driver for Microchip PolarFire SoC
Add support for clock configuration on Microchip PolarFire SoC Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Co-developed-by: Padmarao Begari <padmarao.begari@microchip.com> Signed-off-by: Padmarao Begari <padmarao.begari@microchip.com> Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com> Co-developed-by: Conor Dooley <conor.dooley@microchip.com> Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20220222121143.3316880-2-conor.dooley@microchip.com Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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@ -330,9 +330,6 @@ config COMMON_CLK_PXA
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help
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Support for the Marvell PXA SoC.
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config COMMON_CLK_PIC32
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def_bool COMMON_CLK && MACH_PIC32
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config COMMON_CLK_OXNAS
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bool "Clock driver for the OXNAS SoC Family"
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depends on ARCH_OXNAS || COMPILE_TEST
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@ -407,6 +404,7 @@ source "drivers/clk/keystone/Kconfig"
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source "drivers/clk/mediatek/Kconfig"
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source "drivers/clk/meson/Kconfig"
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source "drivers/clk/mstar/Kconfig"
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source "drivers/clk/microchip/Kconfig"
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source "drivers/clk/mvebu/Kconfig"
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source "drivers/clk/pistachio/Kconfig"
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source "drivers/clk/qcom/Kconfig"
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@ -91,7 +91,7 @@ obj-$(CONFIG_ARCH_KEYSTONE) += keystone/
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obj-$(CONFIG_MACH_LOONGSON32) += loongson1/
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obj-y += mediatek/
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obj-$(CONFIG_ARCH_MESON) += meson/
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obj-$(CONFIG_MACH_PIC32) += microchip/
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obj-y += microchip/
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ifeq ($(CONFIG_COMMON_CLK), y)
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obj-$(CONFIG_ARCH_MMP) += mmp/
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endif
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drivers/clk/microchip/Kconfig
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10
drivers/clk/microchip/Kconfig
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@ -0,0 +1,10 @@
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# SPDX-License-Identifier: GPL-2.0
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config COMMON_CLK_PIC32
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def_bool COMMON_CLK && MACH_PIC32
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config MCHP_CLK_MPFS
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bool "Clk driver for PolarFire SoC"
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depends on (RISCV && SOC_MICROCHIP_POLARFIRE) || COMPILE_TEST
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help
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Supports Clock Configuration for PolarFire SoC
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@ -1,3 +1,4 @@
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# SPDX-License-Identifier: GPL-2.0-only
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obj-$(CONFIG_COMMON_CLK_PIC32) += clk-core.o
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obj-$(CONFIG_PIC32MZDA) += clk-pic32mzda.o
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obj-$(CONFIG_MCHP_CLK_MPFS) += clk-mpfs.o
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381
drivers/clk/microchip/clk-mpfs.c
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381
drivers/clk/microchip/clk-mpfs.c
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@ -0,0 +1,381 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Daire McNamara,<daire.mcnamara@microchip.com>
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* Copyright (C) 2020 Microchip Technology Inc. All rights reserved.
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*/
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <dt-bindings/clock/microchip,mpfs-clock.h>
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/* address offset of control registers */
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#define REG_CLOCK_CONFIG_CR 0x08u
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#define REG_SUBBLK_CLOCK_CR 0x84u
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#define REG_SUBBLK_RESET_CR 0x88u
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struct mpfs_clock_data {
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void __iomem *base;
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struct clk_hw_onecell_data hw_data;
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};
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struct mpfs_cfg_clock {
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const struct clk_div_table *table;
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unsigned int id;
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u8 shift;
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u8 width;
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};
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struct mpfs_cfg_hw_clock {
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struct mpfs_cfg_clock cfg;
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void __iomem *sys_base;
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struct clk_hw hw;
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struct clk_init_data init;
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};
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#define to_mpfs_cfg_clk(_hw) container_of(_hw, struct mpfs_cfg_hw_clock, hw)
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struct mpfs_periph_clock {
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unsigned int id;
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u8 shift;
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};
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struct mpfs_periph_hw_clock {
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struct mpfs_periph_clock periph;
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void __iomem *sys_base;
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struct clk_hw hw;
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};
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#define to_mpfs_periph_clk(_hw) container_of(_hw, struct mpfs_periph_hw_clock, hw)
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/*
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* mpfs_clk_lock prevents anything else from writing to the
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* mpfs clk block while a software locked register is being written.
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*/
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static DEFINE_SPINLOCK(mpfs_clk_lock);
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static const struct clk_parent_data mpfs_cfg_parent[] = {
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{ .index = 0 },
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};
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static const struct clk_div_table mpfs_div_cpu_axi_table[] = {
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{ 0, 1 }, { 1, 2 }, { 2, 4 }, { 3, 8 },
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{ 0, 0 }
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};
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static const struct clk_div_table mpfs_div_ahb_table[] = {
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{ 1, 2 }, { 2, 4}, { 3, 8 },
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{ 0, 0 }
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};
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static unsigned long mpfs_cfg_clk_recalc_rate(struct clk_hw *hw, unsigned long prate)
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{
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struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw);
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struct mpfs_cfg_clock *cfg = &cfg_hw->cfg;
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void __iomem *base_addr = cfg_hw->sys_base;
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u32 val;
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val = readl_relaxed(base_addr + REG_CLOCK_CONFIG_CR) >> cfg->shift;
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val &= clk_div_mask(cfg->width);
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return prate / (1u << val);
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}
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static long mpfs_cfg_clk_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate)
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{
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struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw);
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struct mpfs_cfg_clock *cfg = &cfg_hw->cfg;
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return divider_round_rate(hw, rate, prate, cfg->table, cfg->width, 0);
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}
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static int mpfs_cfg_clk_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long prate)
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{
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struct mpfs_cfg_hw_clock *cfg_hw = to_mpfs_cfg_clk(hw);
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struct mpfs_cfg_clock *cfg = &cfg_hw->cfg;
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void __iomem *base_addr = cfg_hw->sys_base;
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unsigned long flags;
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u32 val;
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int divider_setting;
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divider_setting = divider_get_val(rate, prate, cfg->table, cfg->width, 0);
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if (divider_setting < 0)
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return divider_setting;
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spin_lock_irqsave(&mpfs_clk_lock, flags);
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val = readl_relaxed(base_addr + REG_CLOCK_CONFIG_CR);
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val &= ~(clk_div_mask(cfg->width) << cfg_hw->cfg.shift);
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val |= divider_setting << cfg->shift;
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writel_relaxed(val, base_addr + REG_CLOCK_CONFIG_CR);
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spin_unlock_irqrestore(&mpfs_clk_lock, flags);
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return 0;
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}
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static const struct clk_ops mpfs_clk_cfg_ops = {
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.recalc_rate = mpfs_cfg_clk_recalc_rate,
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.round_rate = mpfs_cfg_clk_round_rate,
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.set_rate = mpfs_cfg_clk_set_rate,
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};
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#define CLK_CFG(_id, _name, _parent, _shift, _width, _table, _flags) { \
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.cfg.id = _id, \
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.cfg.shift = _shift, \
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.cfg.width = _width, \
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.cfg.table = _table, \
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.hw.init = CLK_HW_INIT_PARENTS_DATA(_name, _parent, &mpfs_clk_cfg_ops, \
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_flags), \
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}
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static struct mpfs_cfg_hw_clock mpfs_cfg_clks[] = {
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CLK_CFG(CLK_CPU, "clk_cpu", mpfs_cfg_parent, 0, 2, mpfs_div_cpu_axi_table, 0),
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CLK_CFG(CLK_AXI, "clk_axi", mpfs_cfg_parent, 2, 2, mpfs_div_cpu_axi_table, 0),
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CLK_CFG(CLK_AHB, "clk_ahb", mpfs_cfg_parent, 4, 2, mpfs_div_ahb_table, 0),
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};
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static int mpfs_clk_register_cfg(struct device *dev, struct mpfs_cfg_hw_clock *cfg_hw,
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void __iomem *sys_base)
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{
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cfg_hw->sys_base = sys_base;
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return devm_clk_hw_register(dev, &cfg_hw->hw);
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}
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static int mpfs_clk_register_cfgs(struct device *dev, struct mpfs_cfg_hw_clock *cfg_hws,
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unsigned int num_clks, struct mpfs_clock_data *data)
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{
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void __iomem *sys_base = data->base;
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unsigned int i, id;
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int ret;
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for (i = 0; i < num_clks; i++) {
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struct mpfs_cfg_hw_clock *cfg_hw = &cfg_hws[i];
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ret = mpfs_clk_register_cfg(dev, cfg_hw, sys_base);
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if (ret)
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return dev_err_probe(dev, ret, "failed to register clock id: %d\n",
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cfg_hw->cfg.id);
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id = cfg_hws[i].cfg.id;
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data->hw_data.hws[id] = &cfg_hw->hw;
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}
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return 0;
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}
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static int mpfs_periph_clk_enable(struct clk_hw *hw)
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{
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struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw);
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struct mpfs_periph_clock *periph = &periph_hw->periph;
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void __iomem *base_addr = periph_hw->sys_base;
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u32 reg, val;
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unsigned long flags;
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spin_lock_irqsave(&mpfs_clk_lock, flags);
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reg = readl_relaxed(base_addr + REG_SUBBLK_RESET_CR);
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val = reg & ~(1u << periph->shift);
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writel_relaxed(val, base_addr + REG_SUBBLK_RESET_CR);
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reg = readl_relaxed(base_addr + REG_SUBBLK_CLOCK_CR);
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val = reg | (1u << periph->shift);
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writel_relaxed(val, base_addr + REG_SUBBLK_CLOCK_CR);
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spin_unlock_irqrestore(&mpfs_clk_lock, flags);
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return 0;
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}
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static void mpfs_periph_clk_disable(struct clk_hw *hw)
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{
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struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw);
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struct mpfs_periph_clock *periph = &periph_hw->periph;
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void __iomem *base_addr = periph_hw->sys_base;
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u32 reg, val;
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unsigned long flags;
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spin_lock_irqsave(&mpfs_clk_lock, flags);
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reg = readl_relaxed(base_addr + REG_SUBBLK_RESET_CR);
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val = reg | (1u << periph->shift);
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writel_relaxed(val, base_addr + REG_SUBBLK_RESET_CR);
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reg = readl_relaxed(base_addr + REG_SUBBLK_CLOCK_CR);
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val = reg & ~(1u << periph->shift);
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writel_relaxed(val, base_addr + REG_SUBBLK_CLOCK_CR);
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spin_unlock_irqrestore(&mpfs_clk_lock, flags);
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}
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static int mpfs_periph_clk_is_enabled(struct clk_hw *hw)
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{
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struct mpfs_periph_hw_clock *periph_hw = to_mpfs_periph_clk(hw);
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struct mpfs_periph_clock *periph = &periph_hw->periph;
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void __iomem *base_addr = periph_hw->sys_base;
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u32 reg;
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reg = readl_relaxed(base_addr + REG_SUBBLK_RESET_CR);
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if ((reg & (1u << periph->shift)) == 0u) {
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reg = readl_relaxed(base_addr + REG_SUBBLK_CLOCK_CR);
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if (reg & (1u << periph->shift))
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return 1;
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}
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return 0;
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}
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static const struct clk_ops mpfs_periph_clk_ops = {
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.enable = mpfs_periph_clk_enable,
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.disable = mpfs_periph_clk_disable,
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.is_enabled = mpfs_periph_clk_is_enabled,
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};
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#define CLK_PERIPH(_id, _name, _parent, _shift, _flags) { \
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.periph.id = _id, \
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.periph.shift = _shift, \
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.hw.init = CLK_HW_INIT_HW(_name, _parent, &mpfs_periph_clk_ops, \
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_flags), \
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}
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#define PARENT_CLK(PARENT) (&mpfs_cfg_clks[CLK_##PARENT].hw)
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/*
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* Critical clocks:
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* - CLK_ENVM: reserved by hart software services (hss) superloop monitor/m mode interrupt
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* trap handler
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* - CLK_MMUART0: reserved by the hss
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* - CLK_DDRC: provides clock to the ddr subsystem
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* - CLK_FICx: these provide clocks for sections of the fpga fabric, disabling them would
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* cause the fabric to go into reset
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*/
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static struct mpfs_periph_hw_clock mpfs_periph_clks[] = {
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CLK_PERIPH(CLK_ENVM, "clk_periph_envm", PARENT_CLK(AHB), 0, CLK_IS_CRITICAL),
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CLK_PERIPH(CLK_MAC0, "clk_periph_mac0", PARENT_CLK(AHB), 1, 0),
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CLK_PERIPH(CLK_MAC1, "clk_periph_mac1", PARENT_CLK(AHB), 2, 0),
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CLK_PERIPH(CLK_MMC, "clk_periph_mmc", PARENT_CLK(AHB), 3, 0),
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CLK_PERIPH(CLK_TIMER, "clk_periph_timer", PARENT_CLK(AHB), 4, 0),
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CLK_PERIPH(CLK_MMUART0, "clk_periph_mmuart0", PARENT_CLK(AHB), 5, CLK_IS_CRITICAL),
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CLK_PERIPH(CLK_MMUART1, "clk_periph_mmuart1", PARENT_CLK(AHB), 6, 0),
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CLK_PERIPH(CLK_MMUART2, "clk_periph_mmuart2", PARENT_CLK(AHB), 7, 0),
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CLK_PERIPH(CLK_MMUART3, "clk_periph_mmuart3", PARENT_CLK(AHB), 8, 0),
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CLK_PERIPH(CLK_MMUART4, "clk_periph_mmuart4", PARENT_CLK(AHB), 9, 0),
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CLK_PERIPH(CLK_SPI0, "clk_periph_spi0", PARENT_CLK(AHB), 10, 0),
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CLK_PERIPH(CLK_SPI1, "clk_periph_spi1", PARENT_CLK(AHB), 11, 0),
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CLK_PERIPH(CLK_I2C0, "clk_periph_i2c0", PARENT_CLK(AHB), 12, 0),
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CLK_PERIPH(CLK_I2C1, "clk_periph_i2c1", PARENT_CLK(AHB), 13, 0),
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CLK_PERIPH(CLK_CAN0, "clk_periph_can0", PARENT_CLK(AHB), 14, 0),
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CLK_PERIPH(CLK_CAN1, "clk_periph_can1", PARENT_CLK(AHB), 15, 0),
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CLK_PERIPH(CLK_USB, "clk_periph_usb", PARENT_CLK(AHB), 16, 0),
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CLK_PERIPH(CLK_RTC, "clk_periph_rtc", PARENT_CLK(AHB), 18, 0),
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CLK_PERIPH(CLK_QSPI, "clk_periph_qspi", PARENT_CLK(AHB), 19, 0),
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CLK_PERIPH(CLK_GPIO0, "clk_periph_gpio0", PARENT_CLK(AHB), 20, 0),
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CLK_PERIPH(CLK_GPIO1, "clk_periph_gpio1", PARENT_CLK(AHB), 21, 0),
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CLK_PERIPH(CLK_GPIO2, "clk_periph_gpio2", PARENT_CLK(AHB), 22, 0),
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CLK_PERIPH(CLK_DDRC, "clk_periph_ddrc", PARENT_CLK(AHB), 23, CLK_IS_CRITICAL),
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CLK_PERIPH(CLK_FIC0, "clk_periph_fic0", PARENT_CLK(AHB), 24, CLK_IS_CRITICAL),
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CLK_PERIPH(CLK_FIC1, "clk_periph_fic1", PARENT_CLK(AHB), 25, CLK_IS_CRITICAL),
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CLK_PERIPH(CLK_FIC2, "clk_periph_fic2", PARENT_CLK(AHB), 26, CLK_IS_CRITICAL),
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CLK_PERIPH(CLK_FIC3, "clk_periph_fic3", PARENT_CLK(AHB), 27, CLK_IS_CRITICAL),
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CLK_PERIPH(CLK_ATHENA, "clk_periph_athena", PARENT_CLK(AHB), 28, 0),
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CLK_PERIPH(CLK_CFM, "clk_periph_cfm", PARENT_CLK(AHB), 29, 0),
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};
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static int mpfs_clk_register_periph(struct device *dev, struct mpfs_periph_hw_clock *periph_hw,
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void __iomem *sys_base)
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{
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periph_hw->sys_base = sys_base;
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return devm_clk_hw_register(dev, &periph_hw->hw);
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}
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static int mpfs_clk_register_periphs(struct device *dev, struct mpfs_periph_hw_clock *periph_hws,
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int num_clks, struct mpfs_clock_data *data)
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{
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void __iomem *sys_base = data->base;
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unsigned int i, id;
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int ret;
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for (i = 0; i < num_clks; i++) {
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struct mpfs_periph_hw_clock *periph_hw = &periph_hws[i];
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ret = mpfs_clk_register_periph(dev, periph_hw, sys_base);
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if (ret)
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return dev_err_probe(dev, ret, "failed to register clock id: %d\n",
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periph_hw->periph.id);
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id = periph_hws[i].periph.id;
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data->hw_data.hws[id] = &periph_hw->hw;
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}
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return 0;
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}
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static int mpfs_clk_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mpfs_clock_data *clk_data;
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unsigned int num_clks;
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int ret;
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/* CLK_RESERVED is not part of cfg_clks nor periph_clks, so add 1 */
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num_clks = ARRAY_SIZE(mpfs_cfg_clks) + ARRAY_SIZE(mpfs_periph_clks) + 1;
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clk_data = devm_kzalloc(dev, struct_size(clk_data, hw_data.hws, num_clks), GFP_KERNEL);
|
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if (!clk_data)
|
||||
return -ENOMEM;
|
||||
|
||||
clk_data->base = devm_platform_ioremap_resource(pdev, 0);
|
||||
if (IS_ERR(clk_data->base))
|
||||
return PTR_ERR(clk_data->base);
|
||||
|
||||
clk_data->hw_data.num = num_clks;
|
||||
|
||||
ret = mpfs_clk_register_cfgs(dev, mpfs_cfg_clks, ARRAY_SIZE(mpfs_cfg_clks), clk_data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = mpfs_clk_register_periphs(dev, mpfs_periph_clks, ARRAY_SIZE(mpfs_periph_clks),
|
||||
clk_data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, &clk_data->hw_data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct of_device_id mpfs_clk_of_match_table[] = {
|
||||
{ .compatible = "microchip,mpfs-clkcfg", },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, mpfs_clk_match_table);
|
||||
|
||||
static struct platform_driver mpfs_clk_driver = {
|
||||
.probe = mpfs_clk_probe,
|
||||
.driver = {
|
||||
.name = "microchip-mpfs-clkcfg",
|
||||
.of_match_table = mpfs_clk_of_match_table,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init clk_mpfs_init(void)
|
||||
{
|
||||
return platform_driver_register(&mpfs_clk_driver);
|
||||
}
|
||||
core_initcall(clk_mpfs_init);
|
||||
|
||||
static void __exit clk_mpfs_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&mpfs_clk_driver);
|
||||
}
|
||||
module_exit(clk_mpfs_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Microchip PolarFire SoC Clock Driver");
|
||||
MODULE_LICENSE("GPL v2");
|
Loading…
Reference in New Issue
Block a user