On 21/08/2024 04:23, sunyeal.hong wrote:
> Hello Kwanghoon,
>
>> -----Original Message-----
>> From: Kwanghoon Son <k.son@xxxxxxxxxxx>
>> Sent: Tuesday, August 20, 2024 6:54 PM
>> To: sunyeal.hong <sunyeal.hong@xxxxxxxxxxx>; 'Krzysztof Kozlowski'
>> <krzk@xxxxxxxxxx>; 'Sylwester Nawrocki' <s.nawrocki@xxxxxxxxxxx>; 'Chanwoo
>> Choi' <cw00.choi@xxxxxxxxxxx>; 'Alim Akhtar' <alim.akhtar@xxxxxxxxxxx>;
>> 'Michael Turquette' <mturquette@xxxxxxxxxxxx>; 'Stephen Boyd'
>> <sboyd@xxxxxxxxxx>; 'Rob Herring' <robh@xxxxxxxxxx>; 'Conor Dooley'
>> <conor+dt@xxxxxxxxxx>
>> Cc: linux-samsung-soc@xxxxxxxxxxxxxxx; linux-clk@xxxxxxxxxxxxxxx;
>> devicetree@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
>> kernel@xxxxxxxxxxxxxxx
>> 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@xxxxxxxxxxx>
>>>> Sent: Monday, August 19, 2024 6:32 PM
>>>> To: Sunyeal Hong <sunyeal.hong@xxxxxxxxxxx>; Krzysztof Kozlowski
>>>> <krzk@xxxxxxxxxx>; Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>;
>>>> Chanwoo Choi <cw00.choi@xxxxxxxxxxx>; Alim Akhtar
>>>> <alim.akhtar@xxxxxxxxxxx>; Michael Turquette
>>>> <mturquette@xxxxxxxxxxxx>; Stephen Boyd <sboyd@xxxxxxxxxx>; Rob
>>>> Herring <robh@xxxxxxxxxx>; Conor Dooley <conor+dt@xxxxxxxxxx>
>>>> Cc: linux-samsung-soc@xxxxxxxxxxxxxxx; linux-clk@xxxxxxxxxxxxxxx;
>>>> devicetree@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
>>>> linux- kernel@xxxxxxxxxxxxxxx
>>>> 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@xxxxxxxxxxx>
>>>>> ---
>>>>> 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@xxxxxxxxxxx/
>>>>
>>>> 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
