linux-kernel - Re: [PATCH v4 4/8] drivers: devfreq: add DMC driver for Exynos5422

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Message-id: <84c06add-8375-55a6-01d6-ebbc6af011a9@samsung.com>
Date:   Thu, 07 Mar 2019 09:41:00 +0100
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     cwchoi00@...il.com, Lukasz Luba <l.luba@...tner.samsung.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 4/8] drivers: devfreq: add DMC driver for Exynos5422

Hi Chanwoo,

On 3/7/19 02:10, Chanwoo Choi wrote:
> This patch has the another quetion about the clocks in
> exynos5_dmc_init_clks(). This functions used 'clk_set_parent'
> to make the hierarchy between clocks. I think it is possible to make
> the relation of clocks in DT by using the 'assigned-clocks'.

I'm fine either way, AFAICS it is a matter of setting parent of just
one clock - "mout_mx_mspll_ccore".  The driver needs to get that clock
anyway to enable/disable it as required.  So we will not gain much from
using assigned-clocks I'd say. I don't really have a strong opinion here
as I don't know detailed requirements of the DMC clock configuration
sequence. I'm inclined to keep it in driver as it would be more flexible.

-- 
Regards,
Sylwester