Re: [PATCH 2/2] pwm: pxa: Add optional bus clock

Yixun Lan
2026-04-14T06:04:56Z

Hi Uwe,

On 10:38 Mon 13 Apr , Uwe Kleine-König wrote:
> Hello,
>
> On Thu, Apr 09, 2026 at 12:45:12AM +0000, Yixun Lan wrote:
> > Add one secondary optional bus clock for the PWM PXA driver, also keep it
> > compatible with old single clock.
> >
> > The SpacemiT K3 SoC require one bus clock for PWM controller, acquire
>
> s/one/a/ ?
>
Ok

> > and enable it during probe phase.
> >
> > Signed-off-by: Yixun Lan <dlan@kernel.org>
> > ---
> > drivers/pwm/pwm-pxa.c | 8 +++++++-
> > 1 file changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c
> > index 0f5bdb0e395e..2ace31405c2d 100644
> > --- a/drivers/pwm/pwm-pxa.c
> > +++ b/drivers/pwm/pwm-pxa.c
> > @@ -53,6 +53,7 @@ struct pxa_pwm_chip {
> > struct device *dev;
> >
> > struct clk *clk;
> > + struct clk *bus_clk;
> > void __iomem *mmio_base;
> > };
> >
> > @@ -177,7 +178,12 @@ static int pwm_probe(struct platform_device *pdev)
> > return PTR_ERR(chip);
> > pc = to_pxa_pwm_chip(chip);
> >
> > - pc->clk = devm_clk_get(dev, NULL);
> > + pc->bus_clk = devm_clk_get_optional_enabled(dev, "bus");
> > + if (IS_ERR(pc->bus_clk))
> > + return dev_err_probe(dev, PTR_ERR(pc->bus_clk), "Failed to get bus clock\n");
> > +
> > + /* Get named func clk if bus clock is valid */
> > + pc->clk = devm_clk_get(dev, pc->bus_clk ? "func" : NULL);
>
> A local variable for bus_clk would be sufficient.
>
Ok, will do

> I'm not sure, but I think passing "func" unconditionally to
> devm_clk_get() would also work fine.
Passing "func" unconditionally, will break old compatibles(not k3-pwm), as only
one clocks property is provided, but no clock-names property

--
Yixun Lan (dlan)