linux-kernel - Re: [PATCH v4 7/7] pinctrl: intel: Enumerate PWM device when community has a capability

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Date:   Thu, 17 Nov 2022 10:06:05 +0100
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-pwm@...r.kernel.org, Andy Shevchenko <andy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v4 7/7] pinctrl: intel: Enumerate PWM device when
 community has a capability

Hello,

On Mon, Nov 14, 2022 at 06:55:45PM +0200, Andy Shevchenko wrote:
> Some of the Communities may have PWM capability. In such cases,

Is "Communities" is proper name in this context? If not, I'd not
capitalize it.

> enumerate the PWM device via respective driver. User is still

s/User/A user/ ?

> responsible for setting correct pin muxing for the line that
> needs to output the signal.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Acked-by: Thierry Reding <thierry.reding@...il.com>
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> ---
>  drivers/pinctrl/intel/pinctrl-intel.c | 32 +++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
> index 52ecd66ce357..d61c22e9d531 100644
> --- a/drivers/pinctrl/intel/pinctrl-intel.c
> +++ b/drivers/pinctrl/intel/pinctrl-intel.c
> @@ -21,6 +21,8 @@
>  #include <linux/pinctrl/pinconf.h>
>  #include <linux/pinctrl/pinconf-generic.h>
>  
> +#include <linux/platform_data/x86/pwm-lpss.h>
> +
>  #include "../core.h"
>  #include "pinctrl-intel.h"
>  
> @@ -46,6 +48,8 @@
>  #define PADOWN_MASK(p)			(GENMASK(3, 0) << PADOWN_SHIFT(p))
>  #define PADOWN_GPP(p)			((p) / 8)
>  
> +#define PWMC				0x204
> +
>  /* Offset from pad_regs */
>  #define PADCFG0				0x000
>  #define PADCFG0_RXEVCFG_SHIFT		25
> @@ -1499,6 +1503,30 @@ static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
>  	return 0;
>  }
>  
> +static int intel_pinctrl_probe_pwm(struct intel_pinctrl *pctrl,
> +				   struct intel_community *community)
> +{
> +	static const struct pwm_lpss_boardinfo info = {
> +		.clk_rate = 19200000,
> +		.npwm = 1,
> +		.base_unit_bits = 22,
> +		.bypass = true,
> +	};
> +	struct pwm_lpss_chip *pwm;
> +
> +	if (!(community->features & PINCTRL_FEATURE_PWM))
> +		return 0;
> +
> +	if (!IS_REACHABLE(CONFIG_PWM_LPSS))
> +		return 0;
> +
> +	pwm = devm_pwm_lpss_probe(pctrl->dev, community->regs + PWMC, &info);
> +	if (IS_ERR(pwm))
> +		return PTR_ERR(pwm);
> +
> +	return 0;

The last 3 codelines can be replaced by

	return PTR_ERR_OR_ZERO(pwm);

(but I know it's subjective if you like that or not, so I won't insist;
see also b784c77075023e1a71bc06e6b4f711acb99e9c73).

> +}
> +
>  static int intel_pinctrl_probe(struct platform_device *pdev,
>  			       const struct intel_pinctrl_soc_data *soc_data)
>  {
> @@ -1584,6 +1612,10 @@ static int intel_pinctrl_probe(struct platform_device *pdev,
>  			ret = intel_pinctrl_add_padgroups_by_size(pctrl, community);
>  		if (ret)
>  			return ret;
> +
> +		ret = intel_pinctrl_probe_pwm(pctrl, community);
> +		if (ret)
> +			return ret;
>  	}
>  
>  	irq = platform_get_irq(pdev, 0);

intel_pinctrl_add_padgroups_by_size() doesn't need cleanup in the error
path, so this hunk is fine.

All in all this is all very minor, so:

Acked-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

even if you keep the patch as is.

Best regards
Uwe


-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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