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phy: fsl-imx8mq-usb: support alternate reference clock 

This phy supports both 24MHz and 100MHz clock inputs. By default it's
using XTAL 24MHz and the 100MHz clock is a alternate reference clock.
Add supports to use alternate reference clock in case 24MHz clock
can't work well.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://patch.msgid.link/20251118071947.2504789-2-xu.yang_2@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
pull/1354/merge
Xu Yang 2025-11-18 15:19:47 +08:00 committed by Vinod Koul
parent 0e8fe19c02
commit 3b64ea4768
1 changed files with 21 additions and 2 deletions
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23
drivers/phy/freescale/phy-fsl-imx8mq-usb.c
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@ -16,6 +16,7 @@
#define PHY_CTRL0_REF_SSP_EN BIT(2)
#define PHY_CTRL0_FSEL_MASK GENMASK(10, 5)
#define PHY_CTRL0_FSEL_24M 0x2a
#define PHY_CTRL0_FSEL_100M 0x27
#define PHY_CTRL1 0x4
#define PHY_CTRL1_RESET BIT(0)
@ -108,6 +109,7 @@ struct tca_blk {
struct imx8mq_usb_phy {
struct phy *phy;
struct clk *clk;
struct clk *alt_clk;
void __iomem *base;
struct regulator *vbus;
struct tca_blk *tca;
@ -582,7 +584,8 @@ static int imx8mp_usb_phy_init(struct phy *phy)
/* USB3.0 PHY signal fsel for 24M ref */
value = readl(imx_phy->base + PHY_CTRL0);
value &= ~PHY_CTRL0_FSEL_MASK;
value |= FIELD_PREP(PHY_CTRL0_FSEL_MASK, PHY_CTRL0_FSEL_24M);
value |= FIELD_PREP(PHY_CTRL0_FSEL_MASK, imx_phy->alt_clk ?
PHY_CTRL0_FSEL_100M : PHY_CTRL0_FSEL_24M);
writel(value, imx_phy->base + PHY_CTRL0);
/* Disable alt_clk_en and use internal MPLL clocks */
@ -626,13 +629,24 @@ static int imx8mq_phy_power_on(struct phy *phy)
if (ret)
return ret;
return clk_prepare_enable(imx_phy->clk);
ret = clk_prepare_enable(imx_phy->clk);
if (ret)
return ret;
ret = clk_prepare_enable(imx_phy->alt_clk);
if (ret) {
clk_disable_unprepare(imx_phy->clk);
return ret;
}
return ret;
}
static int imx8mq_phy_power_off(struct phy *phy)
{
struct imx8mq_usb_phy *imx_phy = phy_get_drvdata(phy);
clk_disable_unprepare(imx_phy->alt_clk);
clk_disable_unprepare(imx_phy->clk);
regulator_disable(imx_phy->vbus);
@ -681,6 +695,11 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
return PTR_ERR(imx_phy->clk);
}
imx_phy->alt_clk = devm_clk_get_optional(dev, "alt");
if (IS_ERR(imx_phy->alt_clk))
return dev_err_probe(dev, PTR_ERR(imx_phy->alt_clk),
"Failed to get alt clk\n");
imx_phy->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(imx_phy->base))
return PTR_ERR(imx_phy->base);