linux-kernel - Re: [PATCH 2/3] dt-bindings: mtd: ti,elm: Add support for AM64 ELM

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Date:   Fri, 25 Mar 2022 14:13:06 +0200
From:   Roger Quadros <rogerq@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>, miquel.raynal@...tlin.com,
        robh+dt@...nel.org
Cc:     richard@....at, vigneshr@...com, kishon@...com, nm@...com,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: mtd: ti,elm: Add support for AM64 ELM



On 25/03/2022 14:08, Krzysztof Kozlowski wrote:
> On 25/03/2022 13:05, Roger Quadros wrote:
>>
>>
>> On 24/03/2022 20:26, Krzysztof Kozlowski wrote:
>>> On 23/03/2022 12:18, Roger Quadros wrote:
>>>> TI's AM64 SoC has the Error Locator Module. Add compatible and
>>>> related properties to support ELM on AM64 SoC.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>>>> ---
>>>>  .../devicetree/bindings/mtd/ti,elm.yaml       | 27 ++++++++++++++++++-
>>>>  1 file changed, 26 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/mtd/ti,elm.yaml b/Documentation/devicetree/bindings/mtd/ti,elm.yaml
>>>> index 24ed0fb84204..bc01d35ce605 100644
>>>> --- a/Documentation/devicetree/bindings/mtd/ti,elm.yaml
>>>> +++ b/Documentation/devicetree/bindings/mtd/ti,elm.yaml
>>>> @@ -17,7 +17,9 @@ description:
>>>>  properties:
>>>>    compatible:
>>>>      items:
>>>> -      - const: ti,am3352-elm
>>>> +      - enum:
>>>> +          - ti,am3352-elm
>>>> +          - ti,am64-elm
>>>>  
>>>>    reg:
>>>>      maxItems: 1
>>>> @@ -25,6 +27,17 @@ properties:
>>>>    interrupts:
>>>>      maxItems: 1
>>>>  
>>>> +  clocks:
>>>> +    maxItems: 1
>>>> +    description: Functional clock.
>>>> +
>>>> +  clock-names:
>>>> +    items:
>>>> +      - const: fck
>>>> +
>>>> +  power-domains:
>>>> +    maxItems: 1
>>>> +
>>>>    ti,hwmods:
>>>>      description:
>>>>        Name of the HWMOD associated with ELM. This is for legacy
>>>> @@ -37,6 +50,18 @@ required:
>>>>    - reg
>>>>    - interrupts
>>>>  
>>>> +allOf:
>>>> +  - if:
>>>> +      properties:
>>>> +        compatible:
>>>> +          contains:
>>>> +            const: ti,am64-elm
>>>> +    then:
>>>> +      required:
>>>> +        - clocks
>>>> +        - clock-names
>>>> +        - power-domains
>>>
>>> Are these new properties also valid for am3352?
>>
>> No they are not required for am3352-elm. Only required for K3 based platforms like AM64.
>>
> 
> I understand they are not required, but I asked if they are valid. IOW,
> whether ELM in am3352 also is part of power domain and has clock input?

Yes it does have power and clock domains but they are handled a bit differently
on AM335x platform. i.e. in the parent node

e.g.

               target-module@...00 {                   /* 0x48080000, ap 38 18.0 */
                        compatible = "ti,sysc-omap2", "ti,sysc";
                        reg = <0x80000 0x4>,
                              <0x80010 0x4>,
                              <0x80014 0x4>;
                        reg-names = "rev", "sysc", "syss";
                        ti,sysc-mask = <(SYSC_OMAP2_CLOCKACTIVITY |
                                         SYSC_OMAP2_SOFTRESET |
                                         SYSC_OMAP2_AUTOIDLE)>;
                        ti,sysc-sidle = <SYSC_IDLE_FORCE>,
                                        <SYSC_IDLE_NO>,
                                        <SYSC_IDLE_SMART>;
                        ti,syss-mask = <1>;
                        /* Domains (P, C): per_pwrdm, l4ls_clkdm */
                        clocks = <&l4ls_clkctrl AM3_L4LS_ELM_CLKCTRL 0>;
                        clock-names = "fck";
                        #address-cells = <1>;
                        #size-cells = <1>;
                        ranges = <0x0 0x80000 0x10000>;

                        elm: elm@0 {
                                compatible = "ti,am3352-elm";
                                reg = <0x0 0x2000>;
                                interrupts = <4>;
                                status = "disabled";
                        };
                };

cheers,
-roger