Re: [PATCH 02/13] dt-bindings: clock: google,gs101-clock: add PERIC0 clock management unit

[Krzysztof Kozlowski]

On 27/12/2023 13:38, Tudor Ambarus wrote:
> Hi, Rob,
> 
> On 12/21/23 07:20, Tudor Ambarus wrote:
>>
>>
>> On 12/20/23 15:07, Rob Herring wrote:
>>> On Thu, Dec 14, 2023 at 10:52:32AM +0000, Tudor Ambarus wrote:
>>>> Add dt-schema documentation for the Connectivity Peripheral 0 (PERIC0)
>>>> clock management unit.
>>>>
>>>> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
>>>> ---
>>>>  .../bindings/clock/google,gs101-clock.yaml    | 25 +++++-
>>>>  include/dt-bindings/clock/google,gs101.h      | 86 +++++++++++++++++++
>>>>  2 files changed, 109 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml b/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml
>>>> index 3eebc03a309b..ba54c13c55bc 100644
>>>> --- a/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml
>>>> +++ b/Documentation/devicetree/bindings/clock/google,gs101-clock.yaml
>>>> @@ -30,14 +30,15 @@ properties:
>>>>        - google,gs101-cmu-top
>>>>        - google,gs101-cmu-apm
>>>>        - google,gs101-cmu-misc
>>>> +      - google,gs101-cmu-peric0
>>>>  
>>>>    clocks:
>>>>      minItems: 1
>>>> -    maxItems: 2
>>>> +    maxItems: 3
>>>>  
>>>>    clock-names:
>>>>      minItems: 1
>>>> -    maxItems: 2
>>>> +    maxItems: 3
>>>>  
>>>>    "#clock-cells":
>>>>      const: 1
>>>> @@ -88,6 +89,26 @@ allOf:
>>>>              - const: dout_cmu_misc_bus
>>>>              - const: dout_cmu_misc_sss
>>>>  
>>>> +  - if:
>>>> +      properties:
>>>> +        compatible:
>>>> +          contains:
>>>> +            const: google,gs101-cmu-peric0
>>>> +
>>>> +    then:
>>>> +      properties:
>>>> +        clocks:
>>>> +          items:
>>>> +            - description: External reference clock (24.576 MHz)
>>>> +            - description: Connectivity Peripheral 0 bus clock (from CMU_TOP)
>>>> +            - description: Connectivity Peripheral 0 IP clock (from CMU_TOP)
>>>> +
>>>> +        clock-names:
>>>> +          items:
>>>> +            - const: oscclk
>>>> +            - const: dout_cmu_peric0_bus
>>>> +            - const: dout_cmu_peric0_ip
>>>
>>> 'bus' and 'ip' are sufficient because naming is local to the module. The 
>>> same is true on 'dout_cmu_misc_bus'. As that has not made a release, 
>>> please fix all of them.
>>>
>>
>> Ok, will fix them shortly. Thanks, Rob!
> 
> I tried your suggestion at
> https://lore.kernel.org/linux-arm-kernel/c6cc6e74-6c3d-439b-8dc1-bc50a88a3d8f@xxxxxxxxxx/
> 
> and we noticed that we'd have to update the clock driver as well.
> These CMUs set the DT clock-name of the parent clock in the driver in
> struct samsung_cmu_info::clk_name[]. The driver then tries to enable the
> parent clock based on the clock-name in exynos_arm64_register_cmu().
> 
> In order to enable the parent clock of the CMU the following would be
> needed in the driver:
> 
> diff --git a/drivers/clk/samsung/clk-gs101.c
> b/drivers/clk/samsung/clk-gs101.c
> index 68a27b78b00b..e91836ea3a98 100644
> --- a/drivers/clk/samsung/clk-gs101.c
> +++ b/drivers/clk/samsung/clk-gs101.c
> @@ -2476,7 +2476,7 @@ static const struct samsung_cmu_info misc_cmu_info
> __initconst = {
>         .nr_clk_ids             = CLKS_NR_MISC,
>         .clk_regs               = misc_clk_regs,
>         .nr_clk_regs            = ARRAY_SIZE(misc_clk_regs),
> -       .clk_name               = "dout_cmu_misc_bus",
> +       .clk_name               = "bus",

Yes, obviously, the names are used...

The entire point was that a week ago Rob said:
"As that has not made a release,  please fix all of them."
but if you keep waiting, like 8 days for this simple patch, his
statement is not true anymore.

The only point was to send a fix *the next day*, so I would apply it and
send further. You kind of solved that problem by waiting entire week for
a simple driver and DTS change.

Best regards,
Krzysztof