linux-kernel - Re: [PATCH 1/8] dt-bindings: sun6i-a31-mipi-dphy: Add the interrupts property

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Date:   Fri, 12 Aug 2022 17:44:50 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <maxime@...no.tech>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/8] dt-bindings: sun6i-a31-mipi-dphy: Add the interrupts
 property

Hi Paul,

On 8/12/22 7:22 AM, Paul Kocialkowski wrote:
> On Fri 12 Aug 22, 02:55, Samuel Holland wrote:
>> The sun6i DPHY can generate several interrupts, mostly for reporting
>> error conditions, but also for detecting BTA and UPLS sequences.
>> Document this capability in order to accurately describe the hardware.
>>
>> The DPHY has no interrupt number provided in the vendor documentation
>> because its interrupt line is shared with the DSI controller.
> 
> Interesting! I do see DPHY_INT_EN*/PD* in the Allwinner BSP's
> drivers/media/video/sunxi-vfe/mipi_csi/dphy/dphy_reg_i.h

You can also find some bit of documentation in the T7 User Manual.

> Maybe it would be useful to import the fields in the driver so that the
> next person who'll try to debug DSI can use them directly?
> 
> You might also want to submit a patch as [PATCH NOT FOR MERGE] that
> adds an interrupt routine and some useful debugging.

I think this would be more interesting to someone who knew more about MIPI
CSI/DSI and understood what those errors meant. :)

I'm mostly concerned with bringing up the D1 SoC at the moment.

> Do you think this is also available without a DSI controller?
> I could just give it a try on V3/A83t here and find out :)

I would assume so. It could possibly be shared with the MIPI CSI interrupt (SPI
90) or keep its position at SPI 89.

Regards,
Samuel

>> Fixes: c25b84c00826 ("dt-bindings: display: Convert Allwinner DSI to a schema")
>> Signed-off-by: Samuel Holland <samuel@...lland.org>
>> ---
>>
>>  .../bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml           | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml b/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
>> index 22636c9fdab8..cf49bd99b3e2 100644
>> --- a/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
>> +++ b/Documentation/devicetree/bindings/phy/allwinner,sun6i-a31-mipi-dphy.yaml
>> @@ -24,6 +24,9 @@ properties:
>>    reg:
>>      maxItems: 1
>>  
>> +  interrupts:
>> +    maxItems: 1
>> +
>>    clocks:
>>      items:
>>        - description: Bus Clock
>> @@ -53,6 +56,7 @@ required:
>>    - "#phy-cells"
>>    - compatible
>>    - reg
>> +  - interrupts
>>    - clocks
>>    - clock-names
>>    - resets
>> -- 
>> 2.35.1
>>
>