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iio: frequency: adf4350: add clk provider

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Add clk provider feature for the adf4350.

Even though the driver was sent as an IIO driver in most cases the
device is actually seen as a clock provider.

This patch aims to cover actual usecases requested by users in order to
completely control the output frequencies from userspace.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240621121403.47912-2-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Antoniu Miclaus 2024-06-21 15:13:59 +03:00 committed by Jonathan Cameron
parent 200b81f1c4
commit a1a09713b4
1 changed files with 122 additions and 2 deletions
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124
drivers/iio/frequency/adf4350.c
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@ -19,6 +19,7 @@
#include <linux/gpio/consumer.h>
#include <asm/div64.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@ -36,6 +37,9 @@ struct adf4350_state {
struct gpio_desc *lock_detect_gpiod;
struct adf4350_platform_data *pdata;
struct clk *clk;
struct clk *clkout;
const char *clk_out_name;
struct clk_hw hw;
unsigned long clkin;
unsigned long chspc; /* Channel Spacing */
unsigned long fpfd; /* Phase Frequency Detector */
@ -61,6 +65,8 @@ struct adf4350_state {
__be32 val __aligned(IIO_DMA_MINALIGN);
};
#define to_adf4350_state(_hw) container_of(_hw, struct adf4350_state, hw)
static struct adf4350_platform_data default_pdata = {
.channel_spacing = 10000,
.r2_user_settings = ADF4350_REG2_PD_POLARITY_POS |
@ -381,6 +387,113 @@ static const struct iio_info adf4350_info = {
.debugfs_reg_access = &adf4350_reg_access,
};
static void adf4350_clk_del_provider(void *data)
{
struct adf4350_state *st = data;
of_clk_del_provider(st->spi->dev.of_node);
}
static unsigned long adf4350_clk_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct adf4350_state *st = to_adf4350_state(hw);
unsigned long long tmp;
tmp = (u64)(st->r0_int * st->r1_mod + st->r0_fract) * st->fpfd;
do_div(tmp, st->r1_mod * (1 << st->r4_rf_div_sel));
return tmp;
}
static int adf4350_clk_set_rate(struct clk_hw *hw,
unsigned long rate,
unsigned long parent_rate)
{
struct adf4350_state *st = to_adf4350_state(hw);
if (parent_rate == 0 || parent_rate > ADF4350_MAX_FREQ_REFIN)
return -EINVAL;
st->clkin = parent_rate;
return adf4350_set_freq(st, rate);
}
static int adf4350_clk_prepare(struct clk_hw *hw)
{
struct adf4350_state *st = to_adf4350_state(hw);
st->regs[ADF4350_REG2] &= ~ADF4350_REG2_POWER_DOWN_EN;
return adf4350_sync_config(st);
}
static void adf4350_clk_unprepare(struct clk_hw *hw)
{
struct adf4350_state *st = to_adf4350_state(hw);
st->regs[ADF4350_REG2] |= ADF4350_REG2_POWER_DOWN_EN;
adf4350_sync_config(st);
}
static int adf4350_clk_is_enabled(struct clk_hw *hw)
{
struct adf4350_state *st = to_adf4350_state(hw);
return (st->regs[ADF4350_REG2] & ADF4350_REG2_POWER_DOWN_EN);
}
static const struct clk_ops adf4350_clk_ops = {
.recalc_rate = adf4350_clk_recalc_rate,
.set_rate = adf4350_clk_set_rate,
.prepare = adf4350_clk_prepare,
.unprepare = adf4350_clk_unprepare,
.is_enabled = adf4350_clk_is_enabled,
};
static int adf4350_clk_register(struct adf4350_state *st)
{
struct spi_device *spi = st->spi;
struct clk_init_data init;
struct clk *clk;
const char *parent_name;
int ret;
if (!device_property_present(&spi->dev, "#clock-cells"))
return 0;
if (device_property_read_string(&spi->dev, "clock-output-names", &init.name)) {
init.name = devm_kasprintf(&spi->dev, GFP_KERNEL, "%s-clk",
fwnode_get_name(dev_fwnode(&spi->dev)));
if (!init.name)
return -ENOMEM;
}
parent_name = of_clk_get_parent_name(spi->dev.of_node, 0);
if (!parent_name)
return -EINVAL;
init.ops = &adf4350_clk_ops;
init.parent_names = &parent_name;
init.num_parents = 1;
init.flags = CLK_SET_RATE_PARENT;
st->hw.init = &init;
clk = devm_clk_register(&spi->dev, &st->hw);
if (IS_ERR(clk))
return PTR_ERR(clk);
ret = of_clk_add_provider(spi->dev.of_node, of_clk_src_simple_get, clk);
if (ret)
return ret;
st->clkout = clk;
return devm_add_action_or_reset(&spi->dev, adf4350_clk_del_provider, st);
}
static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
{
struct adf4350_platform_data *pdata;
@ -522,8 +635,6 @@ static int adf4350_probe(struct spi_device *spi)
indio_dev->info = &adf4350_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = &adf4350_chan;
indio_dev->num_channels = 1;
mutex_init(&st->lock);
@ -551,6 +662,15 @@ static int adf4350_probe(struct spi_device *spi)
return ret;
}
ret = adf4350_clk_register(st);
if (ret)
return ret;
if (!st->clkout) {
indio_dev->channels = &adf4350_chan;
indio_dev->num_channels = 1;
}
ret = devm_add_action_or_reset(&spi->dev, adf4350_power_down, indio_dev);
if (ret)
return dev_err_probe(&spi->dev, ret,