Le 09/07/2015 14:03, Maxime Ripard a écrit :
> 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...@atmel.com>
>> Acked-by: Nicolas Ferre <nicolas.fe...@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?
Well, it's because the sama5d3 onwards controllers don't need ramc
controller.
So, reverting the order seems needed. Doesn't it address your question,
or did I lost track?
Bye,
--
Nicolas Ferre
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