Hi,
On 05/04/2018 09:40 AM, Alexandre Torgue wrote:
> Hi Alexandre,
>
> On 05/03/2018 10:53 PM, Alexandre Belloni wrote:
>> Amelie,
>>
>> On 26/04/2018 21:58:03-0500, Rob Herring wrote:
>>> On Thu, Apr 19, 2018 at 03:21:42PM +0200, Amelie Delaunay wrote:
>>>> RTC driver should not be aware of the PWR registers offset and bits
>>>> position. Furthermore, we can imagine that Disable Backup Protection
>>>> (DBP)
>>>> relative register and bit mask could change depending on the SoC. So
>>>> this
>>>> patch moves st,syscfg property from single pwrcfg phandle to pwrcfg
>>>> phandle/offset/mask triplet.
>>>>
>>>> Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx>
>>>> ---
>>>> Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt | 10
>>>> ++++++----
>>>> 1 file changed, 6 insertions(+), 4 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
>>>> b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
>>>> index a66692a..00f8b5d 100644
>>>> --- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
>>>> +++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
>>>> @@ -14,8 +14,10 @@ Required properties:
>>>> It is required only on stm32h7.
>>>> - interrupt-parent: phandle for the interrupt controller.
>>>> - interrupts: rtc alarm interrupt.
>>>> -- st,syscfg: phandle for pwrcfg, mandatory to disable/enable backup
>>>> domain
>>>> - (RTC registers) write protection.
>>>> +- st,syscfg: phandle/offset/mask triplet. The phandle to pwrcfg
>>>> used to
>>>> + access control register at offset, and change the dbp (Disable
>>>> Backup
>>>> + Protection) bit represented by the mask, mandatory to
>>>> disable/enable backup
>>>> + domain (RTC registers) write protection.
>>>
>>> It's fine to add this, but you are breaking compatibility in the driver
>>> with existing DTBs by requiring these new fields.
>>>
>>
>> I'm fine with that change but I would like confirmation that this has
>> been well thought. Maybe Maxime or Alexandre could give their ack.
>>
>
> It's a good thing to remove PWR registers information from RTC driver.
> My only concern was the compatibility with old DT but we can accept it.
> Indeed, Kernel will continue to boot fine, only RTC will not probe if we
> use old DT.
>
> Acked-by: Alexandre TORGUE <alexandre.torgue@xxxxxx>
>
> Regards
> alex
I am going to send a series to update st,syscfg property in
stm32f429/stm32f746/stm32h743 RTC node.
Thanks,
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