Hi Sachin,
Thanks for reviewing the patch
On Wed, Oct 30, 2013 at 12:33 PM, Sachin Kamat <sachin.kamat@xxxxxxxxxx> wrote:
> On 30 October 2013 12:23, Leela Krishna Amudala <l.krishna@xxxxxxxxxxx> wrote:
>> The syscon regmap interface is used to configure AUTOMATIC_WDT_RESET_DISABLE
>> and MASK_WDT_RESET_REQUEST registers of PMU to mask/unmask enable/disable of
>> watchdog in probe and s2r scenarios.
>>
>> Signed-off-by: Leela Krishna Amudala <l.krishna@xxxxxxxxxxx>
>> ---
>> .../devicetree/bindings/watchdog/samsung-wdt.txt | 13 ++-
>> drivers/watchdog/s3c2410_wdt.c | 114 ++++++++++++++++++--
>> 2 files changed, 118 insertions(+), 9 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/watchdog/samsung-wdt.txt b/Documentation/devicetree/bindings/watchdog/samsung-wdt.txt
>> index 2aa486c..c46c7ce 100644
>> --- a/Documentation/devicetree/bindings/watchdog/samsung-wdt.txt
>> +++ b/Documentation/devicetree/bindings/watchdog/samsung-wdt.txt
>> @@ -5,10 +5,21 @@ after a preset amount of time during which the WDT reset event has not
>> occurred.
>>
>> Required properties:
>> -- compatible : should be "samsung,s3c2410-wdt"
>> +- compatible : should be "samsung,s3c2410-wdt" or "samsung,s3c5250-wdt" or "samsung,s3c5420-wdt"
>
> This should be written as "should be one among the following:
> (a) "samsung,s3c2410-wdt" for xyz SoC
> (b) ....
> (c) ...
>
Okay, will change it.
>> - reg : base physical address of the controller and length of memory mapped
>> region.
>> - interrupts : interrupt number to the cpu.
>> +- samsung,pmusysreg : reference node to pmu sysreg (required only in case of Exynos5250 and 5420)
>
> This property is samsung,sysreg.
>
Okay, will keep this as it is and take care in driver
>>
>> Optional properties:
>> - timeout-sec : contains the watchdog timeout in seconds.
>> +
>> +watchdog@101D0000 {
>> + compatible = "samsung,s3c5250-wdt";
>> + reg = <0x101D0000 0x100>;
>> + interrupts = <0 42 0>;
>> + clocks = <&clock 336>;
>> + clock-names = "watchdog";
>> + samsung,sysreg = <&pmu_sys_reg>;
>> + status = "okay";
>> +};
>> diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
>> index 23aad7c..2a3429c 100644
>> --- a/drivers/watchdog/s3c2410_wdt.c
>> +++ b/drivers/watchdog/s3c2410_wdt.c
>> @@ -41,6 +41,8 @@
>> #include <linux/slab.h>
>> #include <linux/err.h>
>> #include <linux/of.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/regmap.h>
>>
>> #define S3C2410_WTCON 0x00
>> #define S3C2410_WTDAT 0x04
>> @@ -61,6 +63,10 @@
>> #define CONFIG_S3C2410_WATCHDOG_ATBOOT (0)
>> #define CONFIG_S3C2410_WATCHDOG_DEFAULT_TIME (15)
>>
>> +#define WDT_DISABLE_REG_OFFSET 0x0408
>> +#define WDT_MASK_RESET_REG_OFFSET 0x040c
>> +#define QUIRK_NEEDS_PMU_CONFIG (1 << 0)
>> +
>> static bool nowayout = WATCHDOG_NOWAYOUT;
>> static int tmr_margin;
>> static int tmr_atboot = CONFIG_S3C2410_WATCHDOG_ATBOOT;
>> @@ -84,6 +90,12 @@ MODULE_PARM_DESC(soft_noboot, "Watchdog action, set to 1 to ignore reboots, "
>> "0 to reboot (default 0)");
>> MODULE_PARM_DESC(debug, "Watchdog debug, set to >1 for debug (default 0)");
>>
>> +struct pmu_config {
>> + int disable_reg;
>> + int mask_reset_reg;
>> + int mask_bit;
>> +};
>> +
>> struct s3c2410_wdt {
>> struct device *dev;
>> struct clk *clock;
>> @@ -94,7 +106,34 @@ struct s3c2410_wdt {
>> unsigned long wtdat_save;
>> struct watchdog_device wdt_device;
>> struct notifier_block freq_transition;
>> + struct pmu_config *wdt_pmu_config;
>> + struct regmap *pmureg;
>> + unsigned int quirks;
>> +};
>> +
>> +static struct pmu_config pmu_config_5250 = {
>> + .disable_reg = WDT_DISABLE_REG_OFFSET,
>> + .mask_reset_reg = WDT_MASK_RESET_REG_OFFSET,
>> + .mask_bit = 20
>> +};
>> +
>> +static struct pmu_config pmu_config_5420 = {
>> + .disable_reg = WDT_DISABLE_REG_OFFSET,
>> + .mask_reset_reg = WDT_MASK_RESET_REG_OFFSET,
>> + .mask_bit = 0
>> +};
>> +
>
> The above 2 structures could also be under ifdef CONFIG_OF
>
Okay, will move it
>> +#ifdef CONFIG_OF
>> +static const struct of_device_id s3c2410_wdt_match[] = {
>> + { .compatible = "samsung,s3c2410-wdt" },
>> + { .compatible = "samsung,s3c5250-wdt",
>> + .data = (struct pmu_config *) &pmu_config_5250 },
>> + { .compatible = "samsung,s3c5420-wdt",
>> + .data = (struct pmu_config *) &pmu_config_5420 },
>> + {},
>> };
>> +MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
>> +#endif
>>
>> /* watchdog control routines */
>>
>> @@ -111,6 +150,40 @@ static inline struct s3c2410_wdt *freq_to_wdt(struct notifier_block *nb)
>> return container_of(nb, struct s3c2410_wdt, freq_transition);
>> }
>>
>> +static void s3c2410wdt_mask_and_disable_reset(int mask, struct s3c2410_wdt *wdt)
>> +{
>> + unsigned int disable, mask_reset;
>> + int ret;
>> +
>> + ret = regmap_read(wdt->pmureg, wdt->wdt_pmu_config->disable_reg,
>> + &disable);
>> + if (ret < 0) {
>> + dev_err(wdt->dev, "%s:%d fail to read disable reg(%d)\n",
>> + __func__, __LINE__, ret);
>
> func and LINE does not add much value. Could be dropped.
>
Okay, will drop it
Best Wishes,
Leela Krishna
>> + return;
>> + }
>> +
>> + ret = regmap_read(wdt->pmureg, wdt->wdt_pmu_config->mask_reset_reg,
>> + &mask_reset);
>> + if (ret < 0) {
>> + dev_err(wdt->dev, "%s:%d fail to read mask reset reg(%d)\n",
>> + __func__, __LINE__, ret);
>
> ditto
>
> --
> With warm regards,
> Sachin
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