linux-kernel - Re: [PATCH] nvmem: sunxi-sid: add support for A64/H5's SID controller

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Date:   Mon, 9 Oct 2017 13:20:37 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Icenowy Zheng <icenowy@...c.io>
Cc:     Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH] nvmem: sunxi-sid: add support for A64/H5's SID controller



On 19/09/17 09:20, Maxime Ripard wrote:
> On Mon, Sep 18, 2017 at 11:42:04PM +0800, Icenowy Zheng wrote:
>> Allwinner A64/H5 SoCs come with a SID controller like the one in H3, but
>> without the silicon bug that makes the initial value at 0x200 wrong, so
>> the value at 0x200 can be directly read.
>>
>> Add support for this kind of SID controller.
>>
>> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
>> ---
>>   Documentation/devicetree/bindings/nvmem/allwinner,sunxi-sid.txt | 1 +
>>   drivers/nvmem/sunxi_sid.c                                       | 6 ++++++
>>   2 files changed, 7 insertions(+)


TBH, I don't fully understand the soc specifics here, but if you want me 
to queue this patch, I would need an ack from Maxime.


thanks,
srini



>>
>> diff --git a/Documentation/devicetree/bindings/nvmem/allwinner,sunxi-sid.txt b/Documentation/devicetree/bindings/nvmem/allwinner,sunxi-sid.txt
>> index ef06d061913c..6ea0836939ee 100644
>> --- a/Documentation/devicetree/bindings/nvmem/allwinner,sunxi-sid.txt
>> +++ b/Documentation/devicetree/bindings/nvmem/allwinner,sunxi-sid.txt
>> @@ -5,6 +5,7 @@ Required properties:
>>     "allwinner,sun4i-a10-sid"
>>     "allwinner,sun7i-a20-sid"
>>     "allwinner,sun8i-h3-sid"
>> +  "allwinner,sun50i-a64-sid"
>>   
>>   - reg: Should contain registers location and length
>>   
>> diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
>> index 0d6648be93b8..3c9fd4fb9207 100644
>> --- a/drivers/nvmem/sunxi_sid.c
>> +++ b/drivers/nvmem/sunxi_sid.c
>> @@ -199,10 +199,16 @@ static const struct sunxi_sid_cfg sun8i_h3_cfg = {
>>   	.need_register_readout = true,
>>   };
>>   
>> +static const struct sunxi_sid_cfg sun50i_a64_cfg = {
>> +	.value_offset = 0x200,
>> +	.size = 0x100,
>> +};
>> +
> 
> How did you get those values?
> 
> Also, it's reported that the SID can only be accessed in secure mode,
> did you test it?
> 
> Maxime
>