linux-kernel - Re: [PATCH 3/9] watchdog: s3c2410_wdt: update to use new exynos_pmu

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Message-ID: <da30a68a-e29f-45c8-aa73-02955255a457@linaro.org>
Date: Tue, 23 Jan 2024 12:19:41 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Peter Griffin <peter.griffin@...aro.org>, arnd@...db.de,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, linux@...ck-us.net,
 wim@...ux-watchdog.org, conor+dt@...nel.org, alim.akhtar@...sung.com,
 jaewon02.kim@...sung.com, chanho61.park@...sung.com,
 semen.protsenko@...aro.org
Cc: kernel-team@...roid.com, tudor.ambarus@...aro.org,
 andre.draszik@...aro.org, saravanak@...gle.com, willmcvicker@...gle.com,
 linux-fsd@...la.com, linux-watchdog@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 3/9] watchdog: s3c2410_wdt: update to use new
 exynos_pmu_*() apis

On 22/01/2024 23:57, Peter Griffin wrote:
> Instead of obtaining the PMU regmap directly use the new exynos_pmu_*()
> APIs. The exynos_pmu_ APIs allow support of newer Exynos SoCs that have
> atomic set/clear bit hardware and platforms where the PMU registers can
> only be accessed via SMC call.
> 
> As all platforms that have PMU registers use these new APIs, remove the
> syscon regmap lookup code, as it is now redundant.
> 
> Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
> ---
>  drivers/watchdog/Kconfig       |  1 +
>  drivers/watchdog/s3c2410_wdt.c | 25 +++++++++----------------
>  2 files changed, 10 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 7d22051b15a2..b3e90e1ddf14 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -513,6 +513,7 @@ config S3C2410_WATCHDOG
>  	depends on ARCH_S3C64XX || ARCH_S5PV210 || ARCH_EXYNOS || COMPILE_TEST
>  	select WATCHDOG_CORE
>  	select MFD_SYSCON if ARCH_EXYNOS
> +	select EXYNOS_PMU

This does not look compatible with S3C64xx and S5Pv210.

>  	help
>  	  Watchdog timer block in the Samsung S3C64xx, S5Pv210 and Exynos
>  	  SoCs. This will reboot the system when the timer expires with
> diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> index 349d30462c8c..fd3a9ce870a0 100644
> --- a/drivers/watchdog/s3c2410_wdt.c
> +++ b/drivers/watchdog/s3c2410_wdt.c
> @@ -28,6 +28,8 @@
>  #include <linux/regmap.h>
>  #include <linux/delay.h>
>  
> +#include <linux/soc/samsung/exynos-pmu.h>
> +
>  #define S3C2410_WTCON		0x00
>  #define S3C2410_WTDAT		0x04
>  #define S3C2410_WTCNT		0x08
> @@ -187,7 +189,6 @@ struct s3c2410_wdt {
>  	struct watchdog_device	wdt_device;
>  	struct notifier_block	freq_transition;
>  	const struct s3c2410_wdt_variant *drv_data;
> -	struct regmap *pmureg;
>  };
>  
>  static const struct s3c2410_wdt_variant drv_data_s3c2410 = {
> @@ -355,8 +356,8 @@ static int s3c2410wdt_disable_wdt_reset(struct s3c2410_wdt *wdt, bool mask)
>  	const u32 val = mask ? mask_val : 0;
>  	int ret;
>  
> -	ret = regmap_update_bits(wdt->pmureg, wdt->drv_data->disable_reg,
> -				 mask_val, val);
> +	ret = exynos_pmu_update(wdt->drv_data->disable_reg,
> +				mask_val, val);
>  	if (ret < 0)
>  		dev_err(wdt->dev, "failed to update reg(%d)\n", ret);
>  
> @@ -370,8 +371,8 @@ static int s3c2410wdt_mask_wdt_reset(struct s3c2410_wdt *wdt, bool mask)
>  	const u32 val = (mask ^ val_inv) ? mask_val : 0;
>  	int ret;
>  
> -	ret = regmap_update_bits(wdt->pmureg, wdt->drv_data->mask_reset_reg,
> -				 mask_val, val);
> +	ret = exynos_pmu_update(wdt->drv_data->mask_reset_reg,
> +				mask_val, val);
>  	if (ret < 0)
>  		dev_err(wdt->dev, "failed to update reg(%d)\n", ret);
>  
> @@ -384,8 +385,8 @@ static int s3c2410wdt_enable_counter(struct s3c2410_wdt *wdt, bool en)
>  	const u32 val = en ? mask_val : 0;
>  	int ret;
>  
> -	ret = regmap_update_bits(wdt->pmureg, wdt->drv_data->cnt_en_reg,
> -				 mask_val, val);
> +	ret = exynos_pmu_update(wdt->drv_data->cnt_en_reg,
> +				mask_val, val);
>  	if (ret < 0)
>  		dev_err(wdt->dev, "failed to update reg(%d)\n", ret);
>  
> @@ -617,7 +618,7 @@ static inline unsigned int s3c2410wdt_get_bootstatus(struct s3c2410_wdt *wdt)
>  	if (!(wdt->drv_data->quirks & QUIRK_HAS_PMU_RST_STAT))
>  		return 0;
>  
> -	ret = regmap_read(wdt->pmureg, wdt->drv_data->rst_stat_reg, &rst_stat);
> +	ret = exynos_pmu_read(wdt->drv_data->rst_stat_reg, &rst_stat);
>  	if (ret)
>  		dev_warn(wdt->dev, "Couldn't get RST_STAT register\n");
>  	else if (rst_stat & BIT(wdt->drv_data->rst_stat_bit))
> @@ -698,14 +699,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev)
>  	if (ret)
>  		return ret;
>  
> -	if (wdt->drv_data->quirks & QUIRKS_HAVE_PMUREG) {
> -		wdt->pmureg = syscon_regmap_lookup_by_phandle(dev->of_node,
> -						"samsung,syscon-phandle");
> -		if (IS_ERR(wdt->pmureg))
> -			return dev_err_probe(dev, PTR_ERR(wdt->pmureg),
> -					     "syscon regmap lookup failed.\n");


Continuing topic from the binding: I don't see how you handle probe
deferral, suspend ordering.

Best regards,
Krzysztof