linux-kernel - Re: [PATCH 4/4] clk: mvebu: Expand mv98dx3236-core-clock support

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Message-ID: <5a974d9d7260432087619486bf5d79ed@svr-chch-ex1.atlnz.lc>
Date:   Tue, 7 Feb 2017 01:25:47 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Stephen Boyd <sboyd@...eaurora.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        "Gregory Clement" <gregory.clement@...e-electrons.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] clk: mvebu: Expand mv98dx3236-core-clock support

On 07/02/17 14:13, Chris Packham wrote:
> On 07/02/17 14:03, Stephen Boyd wrote:
>> On 02/06, Chris Packham wrote:
>>> On 07/02/17 12:14, Stephen Boyd wrote:
>>>> On 02/03, Chris Packham wrote:
>>>>> The initial implementation in commit e120c17a70e5 ("clk: mvebu: support
>>>>> for 98DX3236 SoC") hardcoded a fixed value for the main PLL frequency.
>>>>> Port code from the Marvell supplied Linux kernel to support different
>>>>> PLL frequencies and provide clock gating support.
>>>>>
>>>>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>>>>> ---
>>>>>  .../devicetree/bindings/clock/mvebu-core-clock.txt |   7 +
>>>>>  .../bindings/clock/mvebu-gated-clock.txt           |  11 ++
>>>>>  arch/arm/boot/dts/armada-xp-98dx3236.dtsi          |  14 +-
>>>>>  drivers/clk/mvebu/Makefile                         |   2 +-
>>>>>  drivers/clk/mvebu/armada-xp.c                      |  13 --
>>>>>  drivers/clk/mvebu/mv98dx3236.c                     | 144 +++++++++++++++++++++
>>>>
>>>> This mixes dts and clk driver changes. Any chance it can be split
>>>> up and just have the clk part go through clk tree? Otherwise, I
>>>> can ack this if you want to take it all through arm-soc?
>>>
>>> I'm happy to split it if it will make life easier.
>>>
>>
>> Well do things keep booting if the clk driver parts merge without
>> the associated dts changes? It's nice to maintain backwards
>> compatibility even for a short time to make the merge path
>> easier.
>>
>
> Unfortunately not. I could put the clk changes first (then I'd just have
> checkpatch.pl complaining about new compatible strings). But if the clk
> patches don't land before the dts changes the boards won't boot. However
> that affects 1 person that we know of (me).
>

Actually I wonder if I can try a bit harder to keep a system booting. 
The following might work
1) add the compatible strings to the existing armada clock drivers.
2) update the dts to use the new compatible strings.
3) add the new driver and remove the compatible strings from the armada 
drivers.

#1 would still upset checkpatch.pl because the documentation would only 
arrive in #2.