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ARM i.MX6: change mxs usbphy clock usage

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This mxs usbphy is only needs to be on after system boots
up, and software never needs to control it anymore.
Meanwhile, usbphy's parent needs to be notified if usb
is suspend or not. So we design below mxs usbphy usage:

- usbphy1_gate and usbphy2_gate:
Their parents are dummy clock, we only needs to enable
it after system boots up.
- usbphy1 and usbphy2
Usage reserved bit for this clock, in that case, the refcount
will be updated, but without hardware changing.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
This commit is contained in:
Peter Chen 2013-01-18 10:38:05 +08:00 committed by Shawn Guo
parent d6b9c59194
commit a5120e89e7
2 changed files with 24 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/clock/imx6q-clock.txt
View File

@ -203,6 +203,8 @@ clocks and IDs.
pcie_ref 188
pcie_ref_125m 189
enet_ref 190
usbphy1_gate 191
usbphy2_gate 192
Examples:

26
arch/arm/mach-imx/clk-imx6q.c
View File

@ -154,8 +154,8 @@ enum mx6q_clks {
usdhc4, vdo_axi, vpu_axi, cko1, pll1_sys, pll2_bus, pll3_usb_otg,
pll4_audio, pll5_video, pll8_mlb, pll7_usb_host, pll6_enet, ssi1_ipg,
ssi2_ipg, ssi3_ipg, rom, usbphy1, usbphy2, ldb_di0_div_3_5, ldb_di1_div_3_5,
sata_ref, sata_ref_100m, pcie_ref, pcie_ref_125m, enet_ref,
clk_max
sata_ref, sata_ref_100m, pcie_ref, pcie_ref_125m, enet_ref, usbphy1_gate,
usbphy2_gate, clk_max
};
static struct clk *clk[clk_max];
@ -208,8 +208,21 @@ int __init mx6q_clocks_init(void)
clk[pll7_usb_host] = imx_clk_pllv3(IMX_PLLV3_USB, "pll7_usb_host","osc", base + 0x20, 0x3);
clk[pll8_mlb] = imx_clk_pllv3(IMX_PLLV3_MLB, "pll8_mlb", "osc", base + 0xd0, 0x0);
clk[usbphy1] = imx_clk_gate("usbphy1", "pll3_usb_otg", base + 0x10, 6);
clk[usbphy2] = imx_clk_gate("usbphy2", "pll7_usb_host", base + 0x20, 6);
/*
* Bit 20 is the reserved and read-only bit, we do this only for:
* - Do nothing for usbphy clk_enable/disable
* - Keep refcount when do usbphy clk_enable/disable, in that case,
* the clk framework may need to enable/disable usbphy's parent
*/
clk[usbphy1] = imx_clk_gate("usbphy1", "pll3_usb_otg", base + 0x10, 20);
clk[usbphy2] = imx_clk_gate("usbphy2", "pll7_usb_host", base + 0x20, 20);
/*
* usbphy*_gate needs to be on after system boots up, and software
* never needs to control it anymore.
*/
clk[usbphy1_gate] = imx_clk_gate("usbphy1_gate", "dummy", base + 0x10, 6);
clk[usbphy2_gate] = imx_clk_gate("usbphy2_gate", "dummy", base + 0x20, 6);
clk[sata_ref] = imx_clk_fixed_factor("sata_ref", "pll6_enet", 1, 5);
clk[pcie_ref] = imx_clk_fixed_factor("pcie_ref", "pll6_enet", 1, 4);
@ -436,6 +449,11 @@ int __init mx6q_clocks_init(void)
for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
clk_prepare_enable(clk[clks_init_on[i]]);
if (IS_ENABLED(CONFIG_USB_MXS_PHY)) {
clk_prepare_enable(clk[usbphy1_gate]);
clk_prepare_enable(clk[usbphy2_gate]);
}
/* Set initial power mode */
imx6q_set_lpm(WAIT_CLOCKED);