linux-kernel - Re: [PATCH v1 03/10] clk: at91: pmc: Support backup for programmable clocks

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Message-ID: <CAGkQfmOZBi4tzUSEAD7J+w_v+pZ_yFgPRBaYaLnW-ptFZO0rvg@mail.gmail.com>
Date:   Thu, 14 Sep 2017 09:41:36 +0200
From:   romain izard <romain.izard@...ile-devices.fr>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Wenyou Yang <wenyou.yang@...el.com>,
        Josh Wu <rainyfeeling@...look.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Thierry Reding <thierry.reding@...il.com>,
        Richard Genoud <richard.genoud@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-clk@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-iio@...r.kernel.org,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-pwm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-usb@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 03/10] clk: at91: pmc: Support backup for programmable clocks

2017-09-13 19:03 GMT+02:00 Alexandre Belloni
<alexandre.belloni@...e-electrons.com>:
> On 13/09/2017 at 14:29:35 +0200, Nicolas Ferre wrote:
>> On 08/09/2017 at 17:35, Romain Izard wrote:
>> > From: Romain Izard <romain.izard@...ile-devices.fr>
>> >
>> > Save and restore the System Clock and Programmable Clock register for
>> > the backup use case.
>>
>> "System Clock" seems to be handled in another patch.
>>
>> > Signed-off-by: Romain Izard <romain.izard.pro@...il.com>
>> > ---
>> >  drivers/clk/at91/pmc.c | 5 +++++
>> >  1 file changed, 5 insertions(+)
>> >
>> > diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
>> > index 07dc2861ad3f..5421b03553ec 100644
>> > --- a/drivers/clk/at91/pmc.c
>> > +++ b/drivers/clk/at91/pmc.c
>> > @@ -66,6 +66,7 @@ static struct
>> >     u32 pcr[PMC_MAX_IDS];
>> >     u32 audio_pll0;
>> >     u32 audio_pll1;
>> > +   u32 pckr[3];
>>
>> Some products have different numbers of PCK (only 2 on at91sam9x5 for
>> instance)...
>>
>
> My opinion is that it will be time to change that when multiple SoCs will
> need to save their registers.
>
For the next version, I'll add a #define. But as this code requires a
device tree node with the compatible string "atmel,sama5d2-pmc", I believe
that we can ignore other chips for now.


-- 
Romain Izard