linux-kernel - Re: [PATCH 2/3] nvmem: sunxi_sid: Add support for H616 SID

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Date:   Fri, 11 Aug 2023 15:12:34 +0200
From:   Martin Botka <martin.botka@...ainline.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <mripard@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Alan Ma <tech@...u3d.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>
Subject: Re: [PATCH 2/3] nvmem: sunxi_sid: Add support for H616 SID



On Fri, Aug 11 2023 at 12:17:54 PM +01:00:00, Andre Przywara 
<andre.przywara@....com> wrote:
> On Fri, 11 Aug 2023 13:02:35 +0200
> Martin Botka <martin.botka@...ainline.org> wrote:
> 
> Hi Martin,
> 
>>  Add support for the H616 SID controller.
> 
> thanks for upstreaming this!
> 
>> 
>>  The config can be reused from A64.
>> 
>>  Signed-off-by: Martin Botka <martin.botka@...ainline.org>
>>  ---
>>   drivers/nvmem/sunxi_sid.c | 1 +
>>   1 file changed, 1 insertion(+)
>> 
>>  diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
>>  index a970f1741cc6..df6fb5e0b724 100644
>>  --- a/drivers/nvmem/sunxi_sid.c
>>  +++ b/drivers/nvmem/sunxi_sid.c
>>  @@ -216,6 +216,7 @@ static const struct of_device_id 
>> sunxi_sid_of_match[] = {
>>   	{ .compatible = "allwinner,sun50i-a64-sid", .data = 
>> &sun50i_a64_cfg },
>>   	{ .compatible = "allwinner,sun50i-h5-sid", .data = 
>> &sun50i_a64_cfg },
>>   	{ .compatible = "allwinner,sun50i-h6-sid", .data = &sun50i_h6_cfg 
>> },
>>  +	{ .compatible = "allwinner,sun50i-h616-sid", .data = 
>> &sun50i_a64_cfg },
> 
> You don't need a new compatible string, then.
> Just use
>   compatible = "allwinner,sun50i-h616-sid", 
> "allwinner,sun50i-a64-sid";
> in the DT, and add that combo to the binding, then you don't need any
> driver patches at all - with the added benefit of that already working
> with existing kernels.
I added it cause H5 and A83T were added after their DT binding was in 
and they also use A64 config.
But I will drop this patch and use a64 compatible if that is the 
prefered way :)
> 
> Though I wonder if that has really only 256 bytes of fuses? Do we 
> have any
> evidence of that?
Datasheet has 0 info regarding this. The way i got the size and offset 
was to check the vendor code.
The values matched A64.
> 
> Cheers,
> Andre
> 
>>   	{/* sentinel */},
>>   };
>>   MODULE_DEVICE_TABLE(of, sunxi_sid_of_match);
>> 
>