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

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Date:   Thu, 14 Sep 2017 11:38:45 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     romain izard <romain.izard@...ile-devices.fr>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:     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

On 14/09/2017 at 09:41, romain izard wrote:
> 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.

Fair enough, let's go for this.

Bye,
-- 
Nicolas Ferre