linux-kernel - Re: [PATCH v2 2/2] clk: meson: g12a: add cpu clocks

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Message-ID: <1e0f2d89-7fc1-a2d1-6691-60ff9e1098e8@baylibre.com>
Date:   Thu, 7 Mar 2019 13:24:45 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     jbrunet@...libre.com, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] clk: meson: g12a: add cpu clocks

Hi Martin,

On 05/03/2019 22:10, Martin Blumenstingl wrote:
> On Mon, Mar 4, 2019 at 2:12 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> Add the Amlogic G12A Family CPU Clock tree in read/only for now.
>>
>> The CPU clock can either use the SYS_PLL for > 1GHz frequencies or
>> use a couple of div+mux from 1GHz/667MHz/24MHz source with 2 non-glitch
>> muxes.
>>
>> Proper DVFS support will come in a second time.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> 
> in my previous review I criticized that the post-dividers are not
> mentioned in the description.
> it's not part of v2 but after having a closer look again I think it's
> not a big issue:
> these CPU post-dividers are all marked as read-only and have a comment
> that "ROM monitor code" manages them.

Sorry indeed I forgot to say a word about this, but you pointed the right
thing, they are only here to be complete, not to be used (for now).

Neil

> 
> disclaimer for my "reviewed-by":
> - I don't have access to the datasheet so I can't verify if the clock
> tree from this patch is correct
> - the latest buildroot code with G12A support
> (buildroot_openlinux_kernel_4.9_fbdev_20180706) doesn't have proper
> names for all clocks
> - this review is based on my experience with Meson8* (where Linux also
> manages the CPU clock, unlike on the GX SoCs where it's managed in
> firmware)
> 
> 
> Regards
> Martin
>