linux-kernel - Re: [PATCH 3/3] ARM: dts: Add g3d bus nodes using VDD

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Date:   Mon, 26 Nov 2018 14:19:07 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Kukjin Kim <kgene@...nel.org>, linux-samsung-soc@...r.kernel.org,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 3/3] ARM: dts: Add g3d bus nodes using VDD_INT for
 Exynos542x SoC

Hi Chanwoo,

On Mon, 26 Nov 2018 at 13:08, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>
> Hi Anand,
>
> CLK_DOUT_ACLK_G3D is the clock for GPU h/w and it requires the buck4_reg("vdd_g3d").
>
> bus_wcore uses the buck3_reg("vdd_int"). bus_wcore and bus_g3d don't share the
> same voltage line. It is wrong to make 'bus_g3d' as the child of 'bus_wcore'
> because of using the different regulator.
>
> CLK_DOUT_ACLK_G3D and buck4_reg should be controlled from MALI driver
> with DEVFREQ framework. Unfortunately, MALI driver is not posted to mainline.
>
>

Thanks for your clarification, I missed this point. mali gpu is linked
to buck4_reg
Next time I will ask for the expert how to proceed on some changes.

Best Regards
-Anand