linux-kernel - Re: [PATCH RESEND v8 07/10] watchdog: rzg2l_wdt: Rely on the reset driver for doing proper reset

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Date: Wed, 10 Apr 2024 09:42:16 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: wim@...ux-watchdog.org, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, p.zabel@...gutronix.de,
	geert+renesas@...der.be, magnus.damm@...il.com,
	biju.das.jz@...renesas.com, linux-watchdog@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH RESEND v8 07/10] watchdog: rzg2l_wdt: Rely on the reset
 driver for doing proper reset

On Wed, Apr 10, 2024 at 04:40:41PM +0300, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> The reset driver has been adapted in commit da235d2fac21
> ("clk: renesas: rzg2l: Check reset monitor registers") to check the reset
> monitor bits before declaring reset asserts/de-asserts as
> successful/failure operations. With that, there is no need to keep the
> reset workaround for RZ/V2M in place in the watchdog driver.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> 
> Changes in v8:
> - none
> 
> Changes in v7:
> - none
> 
> Changes in v6:
> - none
> 
> Changes in v5:
> - none
> 
> Changes in v4:
> - collected tag
> 
> Changes in v3:
> - none
> 
> Changes in v2:
> - none
> 
>  drivers/watchdog/rzg2l_wdt.c | 39 ++++--------------------------------
>  1 file changed, 4 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
> index 29eb47bcf984..42f1d5d6f07e 100644
> --- a/drivers/watchdog/rzg2l_wdt.c
> +++ b/drivers/watchdog/rzg2l_wdt.c
> @@ -8,7 +8,6 @@
>  #include <linux/clk.h>
>  #include <linux/delay.h>
>  #include <linux/io.h>
> -#include <linux/iopoll.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> @@ -54,35 +53,11 @@ struct rzg2l_wdt_priv {
>  	struct reset_control *rstc;
>  	unsigned long osc_clk_rate;
>  	unsigned long delay;
> -	unsigned long minimum_assertion_period;
>  	struct clk *pclk;
>  	struct clk *osc_clk;
>  	enum rz_wdt_type devtype;
>  };
>  
> -static int rzg2l_wdt_reset(struct rzg2l_wdt_priv *priv)
> -{
> -	int err, status;
> -
> -	if (priv->devtype == WDT_RZV2M) {
> -		/* WDT needs TYPE-B reset control */
> -		err = reset_control_assert(priv->rstc);
> -		if (err)
> -			return err;
> -		ndelay(priv->minimum_assertion_period);
> -		err = reset_control_deassert(priv->rstc);
> -		if (err)
> -			return err;
> -		err = read_poll_timeout(reset_control_status, status,
> -					status != 1, 0, 1000, false,
> -					priv->rstc);
> -	} else {
> -		err = reset_control_reset(priv->rstc);
> -	}
> -
> -	return err;
> -}
> -
>  static void rzg2l_wdt_wait_delay(struct rzg2l_wdt_priv *priv)
>  {
>  	/* delay timer when change the setting register */
> @@ -187,13 +162,12 @@ static int rzg2l_wdt_restart(struct watchdog_device *wdev,
>  			     unsigned long action, void *data)
>  {
>  	struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
> +	int ret;
>  
>  	clk_prepare_enable(priv->pclk);
>  	clk_prepare_enable(priv->osc_clk);
>  
>  	if (priv->devtype == WDT_RZG2L) {
> -		int ret;
> -
>  		ret = reset_control_deassert(priv->rstc);
>  		if (ret)
>  			return ret;
> @@ -205,7 +179,9 @@ static int rzg2l_wdt_restart(struct watchdog_device *wdev,
>  		rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
>  	} else {
>  		/* RZ/V2M doesn't have parity error registers */
> -		rzg2l_wdt_reset(priv);
> +		ret = reset_control_reset(priv->rstc);
> +		if (ret)
> +			return ret;
>  
>  		wdev->timeout = 0;
>  
> @@ -297,13 +273,6 @@ static int rzg2l_wdt_probe(struct platform_device *pdev)
>  
>  	priv->devtype = (uintptr_t)of_device_get_match_data(dev);
>  
> -	if (priv->devtype == WDT_RZV2M) {
> -		priv->minimum_assertion_period = RZV2M_A_NSEC +
> -			3 * F2CYCLE_NSEC(pclk_rate) + 5 *
> -			max(F2CYCLE_NSEC(priv->osc_clk_rate),
> -			    F2CYCLE_NSEC(pclk_rate));
> -	}
> -
>  	pm_runtime_enable(&pdev->dev);
>  
>  	priv->wdev.info = &rzg2l_wdt_ident;
> -- 
> 2.39.2
>