linux-kernel - Re: [PATCH v6 4/4] clk: samsung: add top clock support for ExynosAuto v920 SoC

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Message-ID: <76a46e34-fc22-477d-a2e6-4767e65a73c4@kernel.org>
Date: Wed, 21 Aug 2024 08:22:48 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "sunyeal.hong" <sunyeal.hong@...sung.com>,
 'Kwanghoon Son' <k.son@...sung.com>,
 'Sylwester Nawrocki' <s.nawrocki@...sung.com>,
 'Chanwoo Choi' <cw00.choi@...sung.com>,
 'Alim Akhtar' <alim.akhtar@...sung.com>,
 'Michael Turquette' <mturquette@...libre.com>,
 'Stephen Boyd' <sboyd@...nel.org>, 'Rob Herring' <robh@...nel.org>,
 'Conor Dooley' <conor+dt@...nel.org>
Cc: linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/4] clk: samsung: add top clock support for ExynosAuto
 v920 SoC

On 21/08/2024 04:23, sunyeal.hong wrote:
> Hello Kwanghoon,
> 
>> -----Original Message-----
>> From: Kwanghoon Son <k.son@...sung.com>
>> Sent: Tuesday, August 20, 2024 6:54 PM
>> To: sunyeal.hong <sunyeal.hong@...sung.com>; 'Krzysztof Kozlowski'
>> <krzk@...nel.org>; 'Sylwester Nawrocki' <s.nawrocki@...sung.com>; 'Chanwoo
>> Choi' <cw00.choi@...sung.com>; 'Alim Akhtar' <alim.akhtar@...sung.com>;
>> 'Michael Turquette' <mturquette@...libre.com>; 'Stephen Boyd'
>> <sboyd@...nel.org>; 'Rob Herring' <robh@...nel.org>; 'Conor Dooley'
>> <conor+dt@...nel.org>
>> Cc: linux-samsung-soc@...r.kernel.org; linux-clk@...r.kernel.org;
>> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
>> kernel@...r.kernel.org
>> Subject: Re: [PATCH v6 4/4] clk: samsung: add top clock support for
>> ExynosAuto v920 SoC
>>
>> On Tue, 2024-08-20 at 10:50 +0900, sunyeal.hong wrote:
>>> Hello Kwanghoon,
>>>
>>>> -----Original Message-----
>>>> From: Kwanghoon Son <k.son@...sung.com>
>>>> Sent: Monday, August 19, 2024 6:32 PM
>>>> To: Sunyeal Hong <sunyeal.hong@...sung.com>; Krzysztof Kozlowski
>>>> <krzk@...nel.org>; Sylwester Nawrocki <s.nawrocki@...sung.com>;
>>>> Chanwoo Choi <cw00.choi@...sung.com>; Alim Akhtar
>>>> <alim.akhtar@...sung.com>; Michael Turquette
>>>> <mturquette@...libre.com>; Stephen Boyd <sboyd@...nel.org>; Rob
>>>> Herring <robh@...nel.org>; Conor Dooley <conor+dt@...nel.org>
>>>> Cc: linux-samsung-soc@...r.kernel.org; linux-clk@...r.kernel.org;
>>>> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
>>>> linux- kernel@...r.kernel.org
>>>> Subject: Re: [PATCH v6 4/4] clk: samsung: add top clock support for
>>>> ExynosAuto v920 SoC
>>>>
>>>> On Mon, 2024-08-19 at 14:24 +0900, Sunyeal Hong wrote:
>>>>> This adds support for CMU_TOP which generates clocks for all the
>>>>> function blocks such as CORE, HSI0/1/2, PERIC0/1 and so on. For
>>>>> CMU_TOP, PLL_SHARED0,1,2,3,4 and 5 will be the sources of this
>>>>> block and they will generate bus clocks.
>>>>>
>>>>> Signed-off-by: Sunyeal Hong <sunyeal.hong@...sung.com>
>>>>> ---
>>>>>  drivers/clk/samsung/Makefile             |    1 +
>>>>>  drivers/clk/samsung/clk-exynosautov920.c | 1173
>>>>> ++++++++++++++++++++++
>>>>>  2 files changed, 1174 insertions(+)  create mode 100644
>>>>> drivers/clk/samsung/clk-exynosautov920.c
>>>>>
>>>>> diff --git a/drivers/clk/samsung/Makefile
>>>>> b/drivers/clk/samsung/Makefile index 3056944a5a54..f1ba48758c78
>>>>> 100644
>>>>> --- a/drivers/clk/samsung/Makefile
>>>>> +++ b/drivers/clk/samsung/Makefile
>>>>> @@ -21,6 +21,7 @@ obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)	+= clk-
>>>> exynos7.o
>>>>>  obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)	+= clk-exynos7885.o
>>>>>  obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)	+= clk-exynos850.o
>>>>>  obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)	+= clk-exynosautov9.o
>>>>> +obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)	+= clk-exynosautov920.o
>>>>>  obj-$(CONFIG_EXYNOS_ARM64_COMMON_CLK)	+= clk-gs101.o
>>>>>  obj-$(CONFIG_S3C64XX_COMMON_CLK)	+= clk-s3c64xx.o
>>>>>  obj-$(CONFIG_S5PV210_COMMON_CLK)	+= clk-s5pv210.o clk-s5pv210-
>>>> audss.o
>>>>> diff --git a/drivers/clk/samsung/clk-exynosautov920.c
>>>>> b/drivers/clk/samsung/clk-exynosautov920.c
>>>>> new file mode 100644
>>>>> index 000000000000..c17d25e3c9a0
>>>>> --- /dev/null
>>>>> +++ b/drivers/clk/samsung/clk-exynosautov920.c
>>>>
>>>> [snip]
>>>>
>>>>> +};
>>>>> +
>>>>> +static const struct samsung_cmu_info peric0_cmu_info __initconst =
>> {
>>>>> +	.mux_clks		= peric0_mux_clks,
>>>>> +	.nr_mux_clks		= ARRAY_SIZE(peric0_mux_clks),
>>>>> +	.div_clks		= peric0_div_clks,
>>>>> +	.nr_div_clks		= ARRAY_SIZE(peric0_div_clks),
>>>>> +	.nr_clk_ids		= CLKS_NR_PERIC0,
>>>>> +	.clk_regs		= peric0_clk_regs,
>>>>> +	.nr_clk_regs		= ARRAY_SIZE(peric0_clk_regs),
>>>>> +	.clk_name		= "dout_clkcmu_peric0_noc",
>>>>
>>>> same question.
>>>> Isn't it "noc"?
>>>> https://lore.kernel.org/linux-samsung-
>>>> soc/58dfae564a4a624e464c7803a309f1f07b5ae83d.camel@...sung.com/
>>>>
>>>> In my case(autov9), if put wrong clk_name dmesg will show that,
>>>> exynos_arm64_register_cmu: could not enable bus clock ...; err = -2
>>>>
>>>> Kwang.
>>>>
>>>>
>>>
>>> clk_name follows the guide document provided by hw. v9 is bus, but v920
>> uses noc.
>>
>> What I mean,
>>
>> .clk_name		= "dout_clkcmu_peric0_noc", // wrong
>> .clk_name		= "noc", // correct
>>
>> Because there is no clock-names "dout_clkcmu_peric0_noc" in
>> exynos/exynosautov920.dtsi.
>>
> 
> The clk_name written here has nothing to do with the device tree. Please look at the code carefully.

Hm? I see in the code clearly:

	clk_get(dev, cmu->clk_name);

Where cmu is the discussed struct.

If you claim it does not have anything to do with DT, then what is it for?

Best regards,
Krzysztof