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

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Date: Tue, 16 Jan 2024 14:43:25 +0530
From: Devarsh Thakkar <devarsht@...com>
To: Conor Dooley <conor@...nel.org>
CC: <jyri.sarha@....fi>, <tomi.valkeinen@...asonboard.com>,
        <airlied@...il.com>, <daniel@...ll.ch>,
        <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <praneeth@...com>, <nm@...com>,
        <vigneshr@...com>, <a-bhatia1@...com>, <j-luthra@...com>,
        <kristo@...nel.org>
Subject: Re: [PATCH 1/2] dt-bindings: display: ti,am65x-dss: Add support for
 common1 region

Hi Conor,

Thanks for the review.

On 15/01/24 21:47, Conor Dooley wrote:
> On Mon, Jan 15, 2024 at 06:27:15PM +0530, Devarsh Thakkar wrote:
>> TI keystone display subsystem present in AM65 and other SoCs such as AM62
> 
> Do all 3 SoCs supported by this binding (am625 am62a7 am65x) have this
> common1 register? If not, you should limit it the platforms that do have
> it.
> 

Yes all 3 SoCs supported by binding have common1 register space supported.

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)

AM62A TRM:
https://www.ti.com/lit/pdf/spruj16 (Section 14.9.9.1 DSS Registers)

Regards
Devarsh

> Thanks,
> Conor.
> 
>> 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>,
>> -- 
>> 2.34.1
>>