linux-kernel - Re: [PATCH v2 5/6] pwm: lpss: Add pwm_lpss

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Date:   Thu, 10 Nov 2022 08:38:31 +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>,
        Hans de Goede <hdegoede@...hat.com>,
        Thierry Reding <thierry.reding@...il.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 v2 5/6] pwm: lpss: Add pwm_lpss_probe() stub

On Tue, Nov 08, 2022 at 04:22:25PM +0200, Andy Shevchenko wrote:
> In case the PWM LPSS module is not provided, allow users to be
> compiled with a help of a pwm_lpss_probe() stub.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
>  include/linux/platform_data/x86/pwm-lpss.h | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/include/linux/platform_data/x86/pwm-lpss.h b/include/linux/platform_data/x86/pwm-lpss.h
> index 296bd837ddbb..c868b396ed2c 100644
> --- a/include/linux/platform_data/x86/pwm-lpss.h
> +++ b/include/linux/platform_data/x86/pwm-lpss.h
> @@ -4,6 +4,8 @@
>  #ifndef __PLATFORM_DATA_X86_PWM_LPSS_H
>  #define __PLATFORM_DATA_X86_PWM_LPSS_H
>  
> +#include <linux/err.h>
> +#include <linux/kconfig.h>
>  #include <linux/types.h>
>  
>  struct device;
> @@ -27,7 +29,16 @@ struct pwm_lpss_boardinfo {
>  	bool other_devices_aml_touches_pwm_regs;
>  };
>  
> +#if IS_REACHABLE(CONFIG_PWM_LPSS)
>  struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, void __iomem *base,
>  				     const struct pwm_lpss_boardinfo *info);
> +#else
> +static inline
> +struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, void __iomem *base,
> +				     const struct pwm_lpss_boardinfo *info)
> +{
> +	return ERR_PTR(-ENODEV);

Would it be more consistent to return the same value as the pwmchip_add
stub does?

Best regards
Uwe

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

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