linux-kernel - Re: [linux-sunxi] Re: [PATCH v3 18/24] drm/sun4i: DW HDMI PHY: Add support for second PLL

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Date:   Thu, 28 Jun 2018 14:59:02 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] Re: [PATCH v3 18/24] drm/sun4i: DW HDMI PHY: Add
 support for second PLL

On Thu, Jun 28, 2018 at 12:56 PM, Jernej Škrabec
<jernej.skrabec@...l.net> wrote:
> Dne četrtek, 28. junij 2018 ob 04:25:54 CEST je Chen-Yu Tsai napisal(a):
>> On Mon, Jun 25, 2018 at 8:02 PM, Jernej Skrabec <jernej.skrabec@...l.net>
> wrote:
>> > Some DW HDMI PHYs, like those found in A64 and R40 SoCs, can select
>> > between two clock parents.
>> >
>> > Add code which reads second PLL from DT.
>> >
>> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
>>
>> This patch by itself does not do anything. It should be merged with the
>> next one.
>
> Maxime said clock changes should be separated from DT changes.
> http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/578775.html

OK. I think the boundary between these two is bit blurred in this case.
And I think implementing support for two or more parents, then actually
adding the second parent makes more sense.

ChenYu