linux-kernel - Re: [PATCH v2 6/6] clk: samsung: exynos5433: Extract PM support to common ARM64 layer

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Message-ID: <ea0055c7-34d4-3da0-0d3a-52020a783922@samsung.com>
Date:   Tue, 21 Feb 2023 08:22:56 +0100
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>
Cc:     Tomasz Figa <tomasz.figa@...il.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>,
        David Virag <virag.david003@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH v2 6/6] clk: samsung: exynos5433: Extract PM support to
 common ARM64 layer

On 19.02.2023 18:36, Sam Protsenko wrote:
> On Wed, 8 Feb 2023 at 17:43, Sam Protsenko <semen.protsenko@...aro.org> wrote:
>> Exynos5433 clock driver implements PM support internally, which might be
>> also useful for other Exynos clock drivers. Extract all PM related code
>> from clk-exynos5433 to common ARM64 functions.
>>
>> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
>> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
>> ---
>> Changes in v2:
>>    - Rebased on top of latest soc/for-next tree
>>    - Included linux/slab.h for kfree (found by kernel test robot)
>>
>>   drivers/clk/samsung/clk-exynos-arm64.c | 171 ++++++++++++++++++++++++-
>>   drivers/clk/samsung/clk-exynos-arm64.h |   3 +
>>   drivers/clk/samsung/clk-exynos5433.c   | 157 +----------------------
>>   3 files changed, 175 insertions(+), 156 deletions(-)
>>
>> diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c
>> index 2aa3f0a5644e..7ad7fd353dda 100644
>> --- a/drivers/clk/samsung/clk-exynos-arm64.c
>> +++ b/drivers/clk/samsung/clk-exynos-arm64.c
>> @@ -10,6 +10,9 @@
>>    */
> Hi Marek,
>
> It just occurred to me that as I'm pulling your code from
> clk-exynos5433.c here, I should've probably added you to this file's
> author list in the header comment. Does that sound right to you? If
> so, I can re-send v3 with fixes.

Fine for me.

> Also, could you please review this series, if possible? I'm working
> right now on PM_DOMAINS support for Exynos850, so along with this
> series that would bring the initial PM support for ARM64 Exynos chips.

Well, feel free to add:

Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>

to v3 (the whole patchset).

The only remark I have is not strictly related to this patchset, but the 
code that is already in drivers/clk/samsung/clk-exynos-arm64.c. Playing 
with GATE_ENABLE_HWACG/GATE_MANUAL is not strictly specific to all 
Exynos ARM64 SoCs. GATE_OFF_START/GATE_OFF_END and the enable register 
bits are something specific to recent Exynos SoCs (like 7885/850/auto9) 
and don't fit well into the generic arm64 clk PM code, but I don't have 
a good idea how to move it to the respective clk drivers and keep it simple.


Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland