| Message ID | 20240715-pwm-v2-2-ff3eece83cbb@nxp.com |
|---|---|
| State | New |
| Headers | show |
| Series | pwm: imx: add 32k clock for 8qm/qxp and workaround a chip issue | expand |
Le 15/07/2024 à 22:29, Frank Li a écrit : > From: Liu Ying <victor.liu-3arQi8VN3Tc@public.gmane.org> > > PWM in i.MX8QXP MIPI subsystem needs the clock '32k'. Use it if the DTS > provides that. > > Signed-off-by: Liu Ying <victor.liu-3arQi8VN3Tc@public.gmane.org> > Signed-off-by: Frank Li <Frank.Li-3arQi8VN3Tc@public.gmane.org> > --- > Change from v1 to v2 > - remove if check for clk > - use dev_err_probe > - remove int val Hi, maybe, switching to clk_bulk_get_all() and the clk_bulk API would simplify the code? See [1] for a similar discussion related to devicetrees and binding if such a change is done. I'm not familiar with it, so I just point it out. Just my 2c. CJ [1]: https://lore.kernel.org/all/65b422fe-ecc1-4f57-bb72-f2fef3a5af28@collabora.com/ > --- > drivers/pwm/pwm-imx27.c | 26 +++++++++++++++++++++----- > 1 file changed, 21 insertions(+), 5 deletions(-) > > diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c > index 9e2bbf5b4a8ce..253afe94c4776 100644 > --- a/drivers/pwm/pwm-imx27.c > +++ b/drivers/pwm/pwm-imx27.c > @@ -15,6 +15,7 @@ > #include <linux/delay.h> > #include <linux/err.h> > #include <linux/io.h> > +#include <linux/iopoll.h> > #include <linux/kernel.h> > #include <linux/module.h> > #include <linux/of.h> > @@ -82,6 +83,7 @@ > struct pwm_imx27_chip { > struct clk *clk_ipg; > struct clk *clk_per; > + struct clk *clk_32k; > void __iomem *mmio_base; > > /* > @@ -101,23 +103,32 @@ static int pwm_imx27_clk_prepare_enable(struct pwm_imx27_chip *imx) > { > int ret; > > + ret = clk_prepare_enable(imx->clk_32k); > + if (ret) > + goto err1; > + > ret = clk_prepare_enable(imx->clk_ipg); > if (ret) > - return ret; > + goto err2; > > ret = clk_prepare_enable(imx->clk_per); > - if (ret) { > - clk_disable_unprepare(imx->clk_ipg); > - return ret; > - } > + if (ret) > + goto err3; > > return 0; > +err3: > + clk_disable_unprepare(imx->clk_ipg); > +err2: > + clk_disable_unprepare(imx->clk_32k); > +err1: > + return ret; > } > > static void pwm_imx27_clk_disable_unprepare(struct pwm_imx27_chip *imx) > { > clk_disable_unprepare(imx->clk_per); > clk_disable_unprepare(imx->clk_ipg); > + clk_disable_unprepare(imx->clk_32k); > } > > static int pwm_imx27_get_state(struct pwm_chip *chip, > @@ -325,6 +336,11 @@ static int pwm_imx27_probe(struct platform_device *pdev) > return dev_err_probe(&pdev->dev, PTR_ERR(imx->clk_per), > "failed to get peripheral clock\n"); > > + imx->clk_32k = devm_clk_get_optional(&pdev->dev, "32k"); > + if (IS_ERR(imx->clk_32k)) > + return dev_err_probe(&pdev->dev, PTR_ERR(imx->clk_32k), > + "failed to get 32k clock\n"); > + > chip->ops = &pwm_imx27_ops; > > imx->mmio_base = devm_platform_ioremap_resource(pdev, 0); >
diff --git a/drivers/pwm/pwm-imx27.c b/drivers/pwm/pwm-imx27.c index 9e2bbf5b4a8ce..253afe94c4776 100644 --- a/drivers/pwm/pwm-imx27.c +++ b/drivers/pwm/pwm-imx27.c @@ -15,6 +15,7 @@ #include <linux/delay.h> #include <linux/err.h> #include <linux/io.h> +#include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> @@ -82,6 +83,7 @@ struct pwm_imx27_chip { struct clk *clk_ipg; struct clk *clk_per; + struct clk *clk_32k; void __iomem *mmio_base; /* @@ -101,23 +103,32 @@ static int pwm_imx27_clk_prepare_enable(struct pwm_imx27_chip *imx) { int ret; + ret = clk_prepare_enable(imx->clk_32k); + if (ret) + goto err1; + ret = clk_prepare_enable(imx->clk_ipg); if (ret) - return ret; + goto err2; ret = clk_prepare_enable(imx->clk_per); - if (ret) { - clk_disable_unprepare(imx->clk_ipg); - return ret; - } + if (ret) + goto err3; return 0; +err3: + clk_disable_unprepare(imx->clk_ipg); +err2: + clk_disable_unprepare(imx->clk_32k); +err1: + return ret; } static void pwm_imx27_clk_disable_unprepare(struct pwm_imx27_chip *imx) { clk_disable_unprepare(imx->clk_per); clk_disable_unprepare(imx->clk_ipg); + clk_disable_unprepare(imx->clk_32k); } static int pwm_imx27_get_state(struct pwm_chip *chip, @@ -325,6 +336,11 @@ static int pwm_imx27_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, PTR_ERR(imx->clk_per), "failed to get peripheral clock\n"); + imx->clk_32k = devm_clk_get_optional(&pdev->dev, "32k"); + if (IS_ERR(imx->clk_32k)) + return dev_err_probe(&pdev->dev, PTR_ERR(imx->clk_32k), + "failed to get 32k clock\n"); + chip->ops = &pwm_imx27_ops; imx->mmio_base = devm_platform_ioremap_resource(pdev, 0);