linux-kernel - Re: [PATCH 2/8] dt-bindings: display: ti,am65x-dss: Add IO CTRL property for AM625 OLDI

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Date:   Mon, 25 Jul 2022 17:04:47 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
To:     Rob Herring <robh@...nel.org>
CC:     Tomi Valkeinen <tomba@...nel.org>, Jyri Sarha <jyri.sarha@....fi>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Darren Etheridge <detheridge@...com>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rahul T R <r-ravikumar@...com>,
        Krunal Bhargav <k-bhargav@...com>,
        Devarsh Thakkar <devarsht@...com>,
        DRI Development List <dri-devel@...ts.freedesktop.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/8] dt-bindings: display: ti,am65x-dss: Add IO CTRL
 property for AM625 OLDI



On 21-Jul-22 05:02, Rob Herring wrote:
> On Tue, Jul 19, 2022 at 01:38:39PM +0530, Aradhya Bhatia wrote:
>> Add am625-io-ctrl dt property to provide access to the control MMR
>> registers for the OLDI TXes.
>>
>> These registers are used to control the power input to the OLDI TXes as
>> well as to configure them in the Loopback test mode.
>>
>> The MMR IO controller device has been updated since the AM65x SoC and
>> hence a newer property is needed to describe the one in AM625 SoC.
>>
>> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
>> ---
>>   .../bindings/display/ti/ti,am65x-dss.yaml     | 21 +++++++++++++++++++
>>   1 file changed, 21 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
>> index 11d9b3821409..672765ad1f30 100644
>> --- a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
>> +++ b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
>> @@ -118,12 +118,33 @@ properties:
>>         and OLDI_CLK_IO_CTRL registers. This property is needed for OLDI
>>         interface to work.
>>   
>> +  ti,am625-oldi-io-ctrl:
>> +    $ref: "/schemas/types.yaml#/definitions/phandle"
>> +    description:
>> +      phandle to syscon device node mapping OLDI IO_CTRL registers, for
>> +      AM625 SoC. The mapped range should point to OLDI0_DAT0_IO_CTRL,
>> +      and map the registers up till OLDI_LB_CTRL. This property allows
>> +      the driver to control the power delivery to the OLDI TXes and
>> +      their loopback control as well.
> 
> What's wrong with the existing ti,am65x-oldi-io-ctrl other than the less
> than ideal naming? And you just continued with the same issue so the
> next part will need yet another property. Sorry, no. Just use the
> existing property.
> 
I introduced the new property because the peripheral was a newer and
different implementation from the previous one.

However, the same property can be re-used. I will do so in the re-spin.

>> +
>>     max-memory-bandwidth:
>>       $ref: /schemas/types.yaml#/definitions/uint32
>>       description:
>>         Input memory (from main memory to dispc) bandwidth limit in
>>         bytes per second
>>   
>> +if:
>> +  properties:
>> +    compatible:
>> +      contains:
>> +        const: ti,am65x-dss
>> +then:
>> +  properties:
>> +    ti,am625-oldi-io-ctrl: false
>> +else:
>> +  properties:
>> +    ti,am65x-oldi-io-ctrl: false
>> +
>>   required:
>>     - compatible
>>     - reg
>> -- 
>> 2.37.0
>>
>>

Regards
Aradhya