linux-kernel - Re: [PATCH 1/4] dt-bindings: rtc: add schema for NXP S32G2/S32G3 SoCs

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Message-ID: <f6c4a4b4-d05d-40e1-8ecd-45df7cc21ebd@oss.nxp.com>
Date: Thu, 12 Sep 2024 15:00:20 +0300
From: Ciprian Marian Costea <ciprianmarian.costea@....nxp.com>
To: Conor Dooley <conor.dooley@...rochip.com>
Cc: Conor Dooley <conor@...nel.org>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 NXP S32 Linux Team <s32@....com>,
 Bogdan-Gabriel Roman <bogdan-gabriel.roman@....com>,
 Ghennadi Procopciuc <ghennadi.procopciuc@....com>
Subject: Re: [PATCH 1/4] dt-bindings: rtc: add schema for NXP S32G2/S32G3 SoCs

On 9/12/2024 2:13 PM, Conor Dooley wrote:
> On Thu, Sep 12, 2024 at 01:55:34PM +0300, Ciprian Marian Costea wrote:
>> On 9/11/2024 9:22 PM, Conor Dooley wrote:
>>> On Wed, Sep 11, 2024 at 10:00:25AM +0300, Ciprian Costea wrote:
>>>> From: Ciprian Marian Costea <ciprianmarian.costea@....nxp.com>
>>>>
>>>> This patch adds the dt-bindings for NXP S32G2/S32G3 SoCs RTC driver.
>>>
>>>> +properties:
>>>> +  compatible:
>>>> +    const: nxp,s32g-rtc
>>>
>>> Also, how come there are not specific compatibles for the two SoCs
>>> supported here?
>>
>> Hello Conor,
>>
>> The RTC module is the same for S32G2 and S32G3 SoCs.
>> Therefore, I did not wanted to add two compatible strings ('nxp,s32g2-rtc'
>> and 'nxp,s32g3-rtc') when there is no actual difference which they could
>> target.
> 
> Are these different fusings of the same silicon, or are they distinctly
> different SoCs that happen to share an IP block?
> 

S32G2 and S32G3 are different SoCs that share the RTC IP block.

>> Furthermore, in the future I plan to refactor the common part from [1] and
>> [2] files into 's32g.dtsi'. Maybe then such common compatible strings would
>> make more sense.
>>
>> [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/freescale/s32g2.dtsi
>>
>> [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/freescale/s32g3.dtsi
>>
>> Regards,
>> Ciprian