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

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Message-ID: <68b64171-6548-44b0-b5c9-8a5343b57828@linaro.org>
Date: Thu, 28 Dec 2023 07:49:46 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Peter Griffin <peter.griffin@...aro.org>
Cc: sboyd@...nel.org, conor+dt@...nel.org, andi.shyti@...nel.org,
 alim.akhtar@...sung.com, gregkh@...uxfoundation.org, jirislaby@...nel.org,
 catalin.marinas@....com, will@...nel.org, s.nawrocki@...sung.com,
 tomasz.figa@...il.com, cw00.choi@...sung.com, arnd@...db.de,
 semen.protsenko@...aro.org, andre.draszik@...aro.org, saravanak@...gle.com,
 willmcvicker@...gle.com, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-i2c@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 02/13] dt-bindings: clock: google,gs101-clock: add PERIC0
 clock management unit



On 12/28/23 07:30, Krzysztof Kozlowski wrote:
> 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@...aro.org>
>>>>> ---
>>>>>  .../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@linaro.org/
>>
>> 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.
> 

I saw the problem at the end of Thursday, reported it, and after that I
entered vacation.

> 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.
> 
Why can't we queue the name fix as a patch for v6.8-rc1? Of course if
you consider that the change is worth it. As I said, I lean towards not
changing it.

Thanks,
ta