linux-kernel - Re: [PATCH v2 4/6] pwm: lpss: Allow other drivers to enable PWM LPSS

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Date:   Thu, 10 Nov 2022 08:28:10 +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 4/6] pwm: lpss: Allow other drivers to enable PWM LPSS

On Tue, Nov 08, 2022 at 04:22:24PM +0200, Andy Shevchenko wrote:
> The PWM LPSS device can be embedded in another device.
> In order to enable it, allow that drivers to probe
> a corresponding device.

"probe" isn't the right term here. The other driver only creates the
device.

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/pwm/pwm-lpss.h                        | 22 +--------------
>  .../linux/platform_data/x86}/pwm-lpss.h       | 28 ++++---------------
>  2 files changed, 6 insertions(+), 44 deletions(-)
>  copy {drivers/pwm => include/linux/platform_data/x86}/pwm-lpss.h (53%)
> 
> diff --git a/drivers/pwm/pwm-lpss.h b/drivers/pwm/pwm-lpss.h
> index 4561d229b27d..b721532c6c3c 100644
> --- a/drivers/pwm/pwm-lpss.h
> +++ b/drivers/pwm/pwm-lpss.h
> @@ -13,27 +13,10 @@
>  #include <linux/pwm.h>
>  #include <linux/types.h>
>  
> -struct device;
> +#include <linux/platform_data/x86/pwm-lpss.h>
>  
>  #define LPSS_MAX_PWMS			4
>  
> -struct pwm_lpss_boardinfo {
> -	unsigned long clk_rate;
> -	unsigned int npwm;
> -	unsigned long base_unit_bits;
> -	/*
> -	 * Some versions of the IP may stuck in the state machine if enable
> -	 * bit is not set, and hence update bit will show busy status till
> -	 * the reset. For the rest it may be otherwise.
> -	 */
> -	bool bypass;
> -	/*
> -	 * On some devices the _PS0/_PS3 AML code of the GPU (GFX0) device
> -	 * messes with the PWM0 controllers state,
> -	 */
> -	bool other_devices_aml_touches_pwm_regs;
> -};
> -

Now that pwm_lpss_boardinfo lives in a different file, this makes the
move of pwm_lpss_chip in patch 3 somewhat redundant.

>  extern const struct pwm_lpss_boardinfo pwm_lpss_byt_info;
>  extern const struct pwm_lpss_boardinfo pwm_lpss_bsw_info;
>  extern const struct pwm_lpss_boardinfo pwm_lpss_bxt_info;
> @@ -45,7 +28,4 @@ struct pwm_lpss_chip {
>  	const struct pwm_lpss_boardinfo *info;
>  };
>  
> -struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, void __iomem *base,
> -				     const struct pwm_lpss_boardinfo *info);
> -
>  #endif	/* __PWM_LPSS_H */

Best regards
Uwe

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

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