On Thu, Jun 25, 2020 at 12:23:54PM +0800, Tanwar, Rahul wrote:
>
> Hi Philipp,
>
> On 18/6/2020 8:25 pm, Philipp Zabel wrote:
> > Hi Rahul,
> >
> > On Thu, 2020-06-18 at 20:05 +0800, Rahul Tanwar wrote:
> >> Intel Lightning Mountain(LGM) SoC contains a PWM fan controller.
> >> This PWM controller does not have any other consumer, it is a
> >> dedicated PWM controller for fan attached to the system. Add
> >> driver for this PWM fan controller.
> >>
> >> Signed-off-by: Rahul Tanwar <rahul.tanwar@xxxxxxxxxxxxxxx>
> >> ---
> >> drivers/pwm/Kconfig | 9 +
> >> drivers/pwm/Makefile | 1 +
> >> drivers/pwm/pwm-intel-lgm.c | 400 ++++++++++++++++++++++++++++++++++++++++++++
> >> 3 files changed, 410 insertions(+)
> >> create mode 100644 drivers/pwm/pwm-intel-lgm.c
> >>
> > [...]
> >> diff --git a/drivers/pwm/pwm-intel-lgm.c b/drivers/pwm/pwm-intel-lgm.c
> >> new file mode 100644
> >> index 000000000000..3c7077acb161
> >> --- /dev/null
> >> +++ b/drivers/pwm/pwm-intel-lgm.c
> >> @@ -0,0 +1,400 @@
> > [...]
> >> +static int lgm_pwm_probe(struct platform_device *pdev)
> >> +{
> >> + struct lgm_pwm_chip *pc;
> >> + struct device *dev = &pdev->dev;
> >> + void __iomem *io_base;
> >> + int ret;
> >> +
> >> + pc = devm_kzalloc(dev, sizeof(*pc), GFP_KERNEL);
> >> + if (!pc)
> >> + return -ENOMEM;
> >> +
> >> + io_base = devm_platform_ioremap_resource(pdev, 0);
> >> + if (IS_ERR(io_base))
> >> + return PTR_ERR(io_base);
> >> +
> >> + pc->regmap = devm_regmap_init_mmio(dev, io_base, &pwm_regmap_config);
> >> + if (IS_ERR(pc->regmap)) {
> >> + ret = PTR_ERR(pc->regmap);
> >> + dev_err(dev, "failed to init register map: %pe\n", pc->regmap);
> >> + return ret;
> >> + }
> >> +
> >> + pc->clk = devm_clk_get(dev, NULL);
> >> + if (IS_ERR(pc->clk)) {
> >> + ret = PTR_ERR(pc->clk);
> >> + dev_err(dev, "failed to get clock: %pe\n", pc->clk);
> >> + return ret;
> >> + }
> >> +
> >> + pc->rst = devm_reset_control_get(dev, NULL);
> >> + if (IS_ERR(pc->rst)) {
> >> + ret = PTR_ERR(pc->rst);
> >> + dev_err(dev, "failed to get reset control: %pe\n", pc->rst);
> >> + return ret;
> >> + }
> > Please use devm_reset_control_get_exclusive() to make it explicit an
> > that exclusive reset control is requested. Given how the reset control
> > is used, I think this driver could also use
> > devm_reset_control_get_shared() to potentially allow sharing a reset
> > line with other devices.
>
> devm_reset_control_get() is a wrapper for devm_reset_control_get_exclusive().
> Code as below:
> static inline struct reset_control *devm_reset_control_get(
> struct device *dev, const char *id)
> {
> return devm_reset_control_get_exclusive(dev, id);
> }
> Am i missing something else?
Obviously you're missing the comment above of_reset_control_get about
some functions being compatibility wrappers.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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