linux-kernel - Re: [PATCH 1/2] dt-bindings: display: ti,am65x-dss: Add support for common1 region

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Message-ID: <839d6de4-b396-4799-8a62-9249727b6dcc@ideasonboard.com>
Date: Wed, 14 Feb 2024 11:23:05 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Devarsh Thakkar <devarsht@...com>, conor+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org
Cc: praneeth@...com, nm@...com, vigneshr@...com, a-bhatia1@...com,
 j-luthra@...com, kristo@...nel.org, jyri.sarha@....fi, airlied@...il.com,
 daniel@...ll.ch, maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
 tzimmermann@...e.de, dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: display: ti,am65x-dss: Add support for
 common1 region

On 14/02/2024 11:10, Tomi Valkeinen wrote:
> Hi,
> 
> On 15/01/2024 14:57, Devarsh Thakkar wrote:
>> TI keystone display subsystem present in AM65 and other SoCs such as AM62
>> support two separate register spaces namely "common" and "common1" which
>> can be used by two separate hosts to program the display controller as
>> described in respective Technical Reference Manuals [1].
>>
>> The common1 register space has similar set of configuration registers as
>> supported in common register space except the global configuration
>> registers which are exclusive to common region.
>>
>> This adds binding for "common1" register region too as supported by the
>> hardware.
>>
>> [1]:
>> AM62x TRM:
>> https://www.ti.com/lit/pdf/spruiv7 (Section 14.8.9.1 DSS Registers)
>>
>> AM65x TRM:
>> https://www.ti.com/lit/pdf/spruid7 (Section 12.6.5 DSS Registers)
>>
>> Signed-off-by: Devarsh Thakkar <devarsht@...com>
>> ---
>>   .../devicetree/bindings/display/ti/ti,am65x-dss.yaml       | 7 +++++--
>>   1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git 
>> a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml 
>> b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
>> index b6767ef0d24d..55e3e490d0e6 100644
>> --- a/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
>> +++ b/Documentation/devicetree/bindings/display/ti/ti,am65x-dss.yaml
>> @@ -37,6 +37,7 @@ properties:
>>         - description: OVR2 overlay manager for vp2
>>         - description: VP1 video port 1
>>         - description: VP2 video port 2
>> +      - description: common1 DSS register area
>>     reg-names:
>>       items:
>> @@ -47,6 +48,7 @@ properties:
>>         - const: ovr2
>>         - const: vp1
>>         - const: vp2
>> +      - const: common1
>>     clocks:
>>       items:
>> @@ -147,9 +149,10 @@ examples:
>>                       <0x04a07000 0x1000>, /* ovr1 */
>>                       <0x04a08000 0x1000>, /* ovr2 */
>>                       <0x04a0a000 0x1000>, /* vp1 */
>> -                    <0x04a0b000 0x1000>; /* vp2 */
>> +                    <0x04a0b000 0x1000>, /* vp2 */
>> +                    <0x04a01000 0x1000>; /* common1 */
>>               reg-names = "common", "vidl1", "vid",
>> -                    "ovr1", "ovr2", "vp1", "vp2";
>> +                    "ovr1", "ovr2", "vp1", "vp2", "common1";
>>               ti,am65x-oldi-io-ctrl = <&dss_oldi_io_ctrl>;
>>               power-domains = <&k3_pds 67 TI_SCI_PD_EXCLUSIVE>;
>>               clocks =        <&k3_clks 67 1>,
> 
> Looks fine to me, I'll apply to drm-misc-next.

Hmm, now thinking about this, doesn't this cause dtb checks to start 
failing, as the dtbs are missing one entry? Is it better to merge these 
kind of changes with the dts changes? Or does it matter?

  Tomi