RE: [PATCH v3 2/2] watchdog: rzg2l_wdt: Add rzv2m support

[Biju Das <biju.das.jz@bp.renesas.com>]

Hi Phil,

Thanks for the patch.

> Subject: [PATCH v3 2/2] watchdog: rzg2l_wdt: Add rzv2m support
> 
> The WDT on RZ/V2M devices is basically the same as RZ/G2L, but without
> the parity error registers. This means the driver has to reset the
> hardware plus set the minimum timeout in order to do a restart and has a
> single interrupt.
> 
> Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
> ---
> v3:
>  - Don't call pm_runtime_get_sync() in restart()
>  - Use mdelay instead of udelay, avoids DIV64_U64_ROUND_UP
> v2:
>  - Replace use of parity error registers in restart
>  - Commit msg modified to reflect different contents
> ---
>  drivers/watchdog/rzg2l_wdt.c | 39 ++++++++++++++++++++++++++++++------
>  1 file changed, 33 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
> index 6eea0ee4af49..70cbd9ba01fe 100644
> --- a/drivers/watchdog/rzg2l_wdt.c
> +++ b/drivers/watchdog/rzg2l_wdt.c
> @@ -10,7 +10,7 @@
>  #include <linux/io.h>
>  #include <linux/kernel.h>
>  #include <linux/module.h>
> -#include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/reset.h>
> @@ -40,6 +40,11 @@ module_param(nowayout, bool, 0);
> MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started
> (default="
>  				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> 
> +enum rz_wdt_type {
> +	I2C_RZG2L,
> +	I2C_RZV2M,
> +};
> +

May be I2C_* to WDT_* ??

>  struct rzg2l_wdt_priv {
>  	void __iomem *base;
>  	struct watchdog_device wdev;
> @@ -48,6 +53,7 @@ struct rzg2l_wdt_priv {
>  	unsigned long delay;
>  	struct clk *pclk;
>  	struct clk *osc_clk;
> +	enum rz_wdt_type devtype;
>  };
> 
>  static void rzg2l_wdt_wait_delay(struct rzg2l_wdt_priv *priv) @@ -
> 142,11 +148,29 @@ static int rzg2l_wdt_restart(struct watchdog_device
> *wdev,
>  	clk_prepare_enable(priv->pclk);
>  	clk_prepare_enable(priv->osc_clk);
> 
> -	/* Generate Reset (WDTRSTB) Signal on parity error */
> -	rzg2l_wdt_write(priv, 0, PECR);
> +	if (priv->devtype == I2C_RZG2L) {

Same here.

> +		/* Generate Reset (WDTRSTB) Signal on parity error */
> +		rzg2l_wdt_write(priv, 0, PECR);
> +
> +		/* Force parity error */
> +		rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
> +	} else {
> +		/* RZ/V2M doesn't have parity error registers */
> +
> +		wdev->timeout = 0;
> +
> +		/* Initialize time out */
> +		rzg2l_wdt_init_timeout(wdev);
> 
> -	/* Force parity error */
> -	rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
> +		/* Initialize watchdog counter register */
> +		rzg2l_wdt_write(priv, 0, WDTTIM);
> +
> +		/* Enable watchdog timer*/
> +		rzg2l_wdt_write(priv, WDTCNT_WDTEN, WDTCNT);
> +
> +		/* Wait 2 consecutive overflow cycles for reset */
> +		mdelay(DIV_ROUND_UP(2 * 0xFFFFF * 1000, priv-
> >osc_clk_rate));
> +	}
> 
>  	return 0;
>  }
> @@ -227,6 +251,8 @@ static int rzg2l_wdt_probe(struct platform_device
> *pdev)
>  	if (ret)
>  		return dev_err_probe(dev, ret, "failed to deassert");
> 
> +	priv->devtype = (enum rz_wdt_type)of_device_get_match_data(dev);
> +
>  	pm_runtime_enable(&pdev->dev);
> 
>  	priv->wdev.info = &rzg2l_wdt_ident;
> @@ -255,7 +281,8 @@ static int rzg2l_wdt_probe(struct platform_device
> *pdev)  }
> 
>  static const struct of_device_id rzg2l_wdt_ids[] = {
> -	{ .compatible = "renesas,rzg2l-wdt", },
> +	{ .compatible = "renesas,rzg2l-wdt", .data = (void *)I2C_RZG2L },
> +	{ .compatible = "renesas,rzv2m-wdt", .data = (void *)I2C_RZV2M },

Same here.

Cheers,
Biju

>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, rzg2l_wdt_ids);
> --
> 2.34.1