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SubjectRe: [PATCH 1/2] power: reset: at91: add sama5d3 reset function
On 7/10/2015 2:54 PM, Maxime Ripard wrote:
> On Fri, Jul 10, 2015 at 11:06:52AM +0800, Josh Wu wrote:
>> Hi, Maxime
>>
>> On 7/9/2015 8:03 PM, Maxime Ripard wrote:
>>> Hi,
>>>
>>> On Thu, Jul 09, 2015 at 06:15:46PM +0800, Josh Wu wrote:
>>>> As since sama5d3, to reset the chip, we don't need to shutdown the ddr
>>>> controller.
>>>>
>>>> So add a new compatible string and new restart function for sama5d3 and
>>>> later chips. As we don't use sama5d3 ddr controller, so remove it as
>>>> well.
>>>>
>>>> Signed-off-by: Josh Wu <josh.wu@atmel.com>
>>>> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
>>>> ---
>>>>
>>>> drivers/power/reset/at91-reset.c | 30 +++++++++++++++++++++---------
>>>> 1 file changed, 21 insertions(+), 9 deletions(-)
>>>>
>>>> diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c
>>>> index 36dc52f..8944b63 100644
>>>> --- a/drivers/power/reset/at91-reset.c
>>>> +++ b/drivers/power/reset/at91-reset.c
>>>> @@ -123,6 +123,14 @@ static int at91sam9g45_restart(struct notifier_block *this, unsigned long mode,
>>>> return NOTIFY_DONE;
>>>> }
>>>> +static int sama5d3_restart(struct notifier_block *this, unsigned long mode,
>>>> + void *cmd)
>>>> +{
>>>> + writel(cpu_to_le32(AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST),
>>>> + at91_rstc_base);
>>>> + return NOTIFY_DONE;
>>>> +}
>>>> +
>>>> static void __init at91_reset_status(struct platform_device *pdev)
>>>> {
>>>> u32 reg = readl(at91_rstc_base + AT91_RSTC_SR);
>>>> @@ -155,13 +163,13 @@ static void __init at91_reset_status(struct platform_device *pdev)
>>>> static const struct of_device_id at91_ramc_of_match[] = {
>>>> { .compatible = "atmel,at91sam9260-sdramc", },
>>>> { .compatible = "atmel,at91sam9g45-ddramc", },
>>>> - { .compatible = "atmel,sama5d3-ddramc", },
>>>> { /* sentinel */ }
>>>> };
>>>> static const struct of_device_id at91_reset_of_match[] = {
>>>> { .compatible = "atmel,at91sam9260-rstc", .data = at91sam9260_restart },
>>>> { .compatible = "atmel,at91sam9g45-rstc", .data = at91sam9g45_restart },
>>>> + { .compatible = "atmel,sama5d3-rstc", .data = sama5d3_restart },
>>>> { /* sentinel */ }
>>>> };
>>>> @@ -181,17 +189,21 @@ static int at91_reset_of_probe(struct platform_device *pdev)
>>>> return -ENODEV;
>>>> }
>>>> - for_each_matching_node(np, at91_ramc_of_match) {
>>>> - at91_ramc_base[idx] = of_iomap(np, 0);
>>>> - if (!at91_ramc_base[idx]) {
>>>> - dev_err(&pdev->dev, "Could not map ram controller address\n");
>>>> - return -ENODEV;
>>>> + match = of_match_node(at91_reset_of_match, pdev->dev.of_node);
>>>> + at91_restart_nb.notifier_call = match->data;
>>>> +
>>>> + if (match->data != sama5d3_restart) {
>>> Using of_device_is_compatible seems more appropriate.
>>>
>>> Also, why are you changing the order of this loop and the notifier
>>> registration?
>> I moved this order because I use the match->data to compare whether is
>> sama5d3_restart. So I need to move this function (of_match_node) up.
> Ah right, my bad.
>
> Still, testing against the kernel pointer is not that great.
>
> It would be great to use something explicit instead, like
> of_device_is_compatible.

I agree. I will use of_device_is_compatible() in v2. And that can avoid
the order change in the loop as well. Thanks.

Best Regards,
Josh Wu

>
> Maxime
>



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