linux-kernel - Re: [PATCH] drm/pl111: Register the clock divider and use it.

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Message-ID: <87zif3je6q.fsf@eliezer.anholt.net>
Date:   Wed, 26 Apr 2017 10:01:33 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     "open list\:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Tom Cooksey <tom.cooksey@....com>,
        Russell King <linux@...linux.org.uk>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/pl111: Register the clock divider and use it.

Linus Walleij <linus.walleij@...aro.org> writes:

> On Mon, Apr 24, 2017 at 9:45 PM, Eric Anholt <eric@...olt.net> wrote:
>
>> This is required for the panel to work on bcm911360, where CLCDCLK is
>> the fixed 200Mhz AXI41 clock.  The rate set is still passed up to the
>> CLCDCLK, for platforms that have a settable rate on that one.
>>
>> Signed-off-by: Eric Anholt <eric@...olt.net>
>
> I like this, it is pretty.

An aside, for anyone else considering common clk and thinking "this is a
bit more complicated than I need": It's really nice for platform
debugging to have your divider or mux or whatever show up in
/debug/clk/clk_summary.  I don't know how many times I've been saved by
diffing that file between a good and bad state of my platform.

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