linux-kernel - Re: [PATCH 7/9] [media] s5p-jpeg: Change sclk

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Message-id: <2b94d31d-7a76-53b7-e8eb-b516cdfea2fc@samsung.com>
Date:   Mon, 05 Jun 2017 12:26:43 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Thierry Escande <thierry.escande@...labora.com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH 7/9] [media] s5p-jpeg: Change sclk_jpeg to 166MHz for
 Exynos5250

On 06/02/2017 11:58 PM, Jacek Anaszewski wrote:
> On 06/02/2017 06:02 PM, Thierry Escande wrote:
>> From: henryhsu<henryhsu@...omium.org>
>>
>> The default clock parent of jpeg on Exynos5250 is fin_pll, which is
>> 24MHz. We have to change the clock parent to CPLL, which is 333MHz,
>> and set sclk_jpeg to 166MHz.

There is no need to patch the driver for these platform specific clock
settings, it can be specified in the device tree with the "assigned-clocks"
properties. There is an example in mainline for exynos3250 SoC already [1].

-- 
Thanks,
Sylwester

[1] 
http://elixir.free-electrons.com/linux/v4.6/source/arch/arm/boot/dts/exynos3250.dtsi#L263