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SubjectRe: [PATCH] power: reset: use restart_notifier mechanism for msm poweroff
Hi Guenter,
Thanks for you.

On 19-09-2014 07:23 PM, Guenter Roeck wrote:
> On 09/19/2014 05:06 AM, Pramod Gurav wrote:
>> This change uses replaces use of arm_pm_restart with recently introduced
>> reset mechanism in Linux kernel called restart_notifier.
>>
>> Cc: Guenter Roeck <linux@roeck-us.net>
>> Cc: Josh Cartwright <joshc@codeaurora.org>
>> Cc: Sebastian Reichel <sre@kernel.org>
>> Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
>> Cc: David Woodhouse <dwmw2@infradead.org>
>> Cc: Stephen Boyd <sboyd@codeaurora.org>
>> Cc: linux-pm@vger.kernel.org
>>
>> Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
>>
>> ---
>>
>> This patch is tested on DB8074 Target and are based on patchset [1]
>> by Guenter Roeck.
>>
>> [1]: https://patchwork.kernel.org/patch/4746721/
>>
>> drivers/power/reset/msm-poweroff.c | 18 +++++++++++++++---
>> 1 file changed, 15 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/power/reset/msm-poweroff.c b/drivers/power/reset/msm-poweroff.c
>> index 774f9a3..59b368c 100644
>> --- a/drivers/power/reset/msm-poweroff.c
>> +++ b/drivers/power/reset/msm-poweroff.c
>> @@ -24,17 +24,21 @@
>> #include <asm/system_misc.h>
>>
>> static void __iomem *msm_ps_hold;
>> +static struct notifier_block restart_nb;
>>
>> -static void do_msm_restart(enum reboot_mode reboot_mode, const char *cmd)
>> +static int do_msm_restart(struct notifier_block *nb, unsigned long action,
>> + void *data)
>> {
>> writel(0, msm_ps_hold);
>> mdelay(10000);
>> +
>> + return NOTIFY_DONE;
>> }
>>
>> static void do_msm_poweroff(void)
>> {
>> /* TODO: Add poweroff capability */
>> - do_msm_restart(REBOOT_HARD, NULL);
>> + do_msm_restart(&restart_nb, 0, NULL);
>> }
>>
>> static int msm_restart_probe(struct platform_device *pdev)
>> @@ -47,8 +51,16 @@ static int msm_restart_probe(struct platform_device *pdev)
>> if (IS_ERR(msm_ps_hold))
>> return PTR_ERR(msm_ps_hold);
>>
>> + restart_nb.notifier_call = do_msm_restart;
>> + restart_nb.priority = 128;
>
> Since the structure is static, you might as well initialize it there
> and save a few bytes of code.
>
>> + if (register_restart_handler(&restart_nb)) {
>> + dev_err(&pdev->dev,
>> + "failed to setup restart handler.\n");
>
> 'failed to register ...' might be a bit better wording.
>
>> + restart_nb.notifier_call = NULL;
>
> No need to set notifier_call to NULL.

Will address the comments and send v2.
>
>> + }
>> +
>> pm_power_off = do_msm_poweroff;
>> - arm_pm_restart = do_msm_restart;
>> +
>> return 0;
>> }
>>
>>
>
> --
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