linux-kernel - Re: [PATCH v3 3/8] watchdog: at91rm9200: use the regmap from mfd

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Date:	Mon, 12 Jan 2015 09:28:49 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Wim Van Sebroeck <wim@...ana.be>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v3 3/8] watchdog: at91rm9200: use the regmap from mfd

On Mon, Jan 12, 2015 at 04:36:58PM +0100, Alexandre Belloni wrote:
> The system timer MFD driver is providing a regmap. Use it to access the
> registers.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

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

> ---
>  drivers/watchdog/Kconfig          |  2 +-
>  drivers/watchdog/at91rm9200_wdt.c | 25 ++++++++++++-------------
>  2 files changed, 13 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 08f41add1461..18c73bc159fc 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -154,7 +154,7 @@ config ARM_SP805_WATCHDOG
>  
>  config AT91RM9200_WATCHDOG
>  	tristate "AT91RM9200 watchdog"
> -	depends on SOC_AT91RM9200
> +	depends on SOC_AT91RM9200 && MFD_ATMEL_ST
>  	help
>  	  Watchdog timer embedded into AT91RM9200 chips. This will reboot your
>  	  system when the timeout is reached.
> diff --git a/drivers/watchdog/at91rm9200_wdt.c b/drivers/watchdog/at91rm9200_wdt.c
> index d244112d5b6f..a4ac88e450a2 100644
> --- a/drivers/watchdog/at91rm9200_wdt.c
> +++ b/drivers/watchdog/at91rm9200_wdt.c
> @@ -17,22 +17,24 @@
>  #include <linux/init.h>
>  #include <linux/io.h>
>  #include <linux/kernel.h>
> +#include <linux/mfd/atmel-st.h>
>  #include <linux/miscdevice.h>
>  #include <linux/module.h>
>  #include <linux/moduleparam.h>
>  #include <linux/platform_device.h>
> +#include <linux/regmap.h>
>  #include <linux/types.h>
>  #include <linux/watchdog.h>
>  #include <linux/uaccess.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> -#include <mach/at91_st.h>
>  
>  #define WDT_DEFAULT_TIME	5	/* seconds */
>  #define WDT_MAX_TIME		256	/* seconds */
>  
>  static int wdt_time = WDT_DEFAULT_TIME;
>  static bool nowayout = WATCHDOG_NOWAYOUT;
> +static struct regmap *regmap_st;
>  
>  module_param(wdt_time, int, 0);
>  MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
> @@ -55,7 +57,7 @@ static unsigned long at91wdt_busy;
>   */
>  static inline void at91_wdt_stop(void)
>  {
> -	at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN);
> +	regmap_write(regmap_st, AT91_ST_WDMR, AT91_ST_EXTEN);
>  }
>  
>  /*
> @@ -63,9 +65,9 @@ static inline void at91_wdt_stop(void)
>   */
>  static inline void at91_wdt_start(void)
>  {
> -	at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
> +	regmap_write(regmap_st, AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
>  				(((65536 * wdt_time) >> 8) & AT91_ST_WDV));
> -	at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
> +	regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);
>  }
>  
>  /*
> @@ -73,7 +75,7 @@ static inline void at91_wdt_start(void)
>   */
>  static inline void at91_wdt_reload(void)
>  {
> -	at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
> +	regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);
>  }
>  
>  /* ......................................................................... */
> @@ -209,6 +211,10 @@ static int at91wdt_probe(struct platform_device *pdev)
>  		return -EBUSY;
>  	at91wdt_miscdev.parent = &pdev->dev;
>  
> +	regmap_st = dev_get_drvdata(pdev->dev.parent);
> +	if (!regmap_st)
> +		return -ENODEV;
> +
>  	res = misc_register(&at91wdt_miscdev);
>  	if (res)
>  		return res;
> @@ -254,12 +260,6 @@ static int at91wdt_resume(struct platform_device *pdev)
>  #define at91wdt_resume	NULL
>  #endif
>  
> -static const struct of_device_id at91_wdt_dt_ids[] = {
> -	{ .compatible = "atmel,at91rm9200-wdt" },
> -	{ /* sentinel */ }
> -};
> -MODULE_DEVICE_TABLE(of, at91_wdt_dt_ids);
> -
>  static struct platform_driver at91wdt_driver = {
>  	.probe		= at91wdt_probe,
>  	.remove		= at91wdt_remove,
> @@ -267,8 +267,7 @@ static struct platform_driver at91wdt_driver = {
>  	.suspend	= at91wdt_suspend,
>  	.resume		= at91wdt_resume,
>  	.driver		= {
> -		.name	= "at91_wdt",
> -		.of_match_table = at91_wdt_dt_ids,
> +		.name	= "atmel_st_watchdog",
>  	},
>  };
>  
> -- 
> 2.1.0
> 
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