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

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Message-ID: <20220720233235.GA4180021-robh@kernel.org>
Date:   Wed, 20 Jul 2022 17:32:35 -0600
From:   Rob Herring <robh@...nel.org>
To:     Aradhya Bhatia <a-bhatia1@...com>
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 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.

> +
>    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
> 
>