Re: [RESEND PATCH v2 02/13] drivers: clk: st: Simplify clock binding of STiH4xx platforms

[Gabriel Fernandez <gabriel.fernandez@st.com>]

On 07/08/2016 06:08 PM, Michael Turquette wrote:
> Quoting Gabriel Fernandez (2016-07-08 02:12:35)
>> Hi Mike,
>>
>> On 07/08/2016 03:43 AM, Michael Turquette wrote:
>>> Quoting Rob Herring (2016-06-19 08:04:58)
>>>> On Thu, Jun 16, 2016 at 11:20:22AM +0200, Gabriel Fernandez wrote:
>>>>> This patch reworks the clock binding to avoid too much detail in DT.
>>>>> Now we have only compatible string per type of clock
>>>>> (remark from Rob https://lkml.org/lkml/2016/5/25/492)
>>>>>
>>>> I have no idea what the clock trees and clock controller in these chips
>>>> look like, so it's hard to say if the changes here are good. It still
>>>> looks like things are somewhat fine grained clocks in DT. I'll leave
>>>> it up to the platform maintainers to decide...
>>> Is this series breaking ABI? If yes, why not do what Maxime did for the
>>> Allwinner/sunxi clocks and just fully convert over to a
>>> one-node-per-clock-controller binding? This one-node-per-clock stuff is
>>> pretty unfortunate, and if we're deprecating platforms (patch #1) then
>>> now might be a good time to re-evaluate the whole thing.
>> The goal of my patchset was to be aligned with DRM / KMS development and
>> to offer
>> the possibility to make a correct video playback on STiH407/STiH410
>> platform.
>> Our milestone is the 4.8 for that.
>>
>> Currently people need these patches to work.
>> I'm not sure it's a good time to re-evaluate the whole thing.
>>
>> Is it possible to re-evaluate later ?
> Are you OK to break ABI later? Or at a minimum, deprecate the current
> binding (maintain it forever for legacy platforms) and create a new
> clock controller binding description that supersedes the legacy binding
> for all new platforms?
>
> If the answer to either question is "yes", then I'm OK to put it aside
> for now. But if the answer to both is "no", and this patch series is
> breaking ABI, then we really should fix it now.

Hi Mike,
i m ok to break ABI later.

Many Thanks !

Best Regards

Gabriel.

> Regards,
> Mike
>
>> Best regards,
>> Gabriel
>>
>>> Regards,
>>> Mike
>>>
>>>>    
>>>>> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@linaro.org>
>>>>> ---
>>>>>    .../devicetree/bindings/clock/st/st,clkgen-mux.txt |  2 +-
>>>>>    .../devicetree/bindings/clock/st/st,clkgen-pll.txt | 11 ++--
>>>>>    .../devicetree/bindings/clock/st/st,clkgen.txt     |  2 +-
>>>>>    .../devicetree/bindings/clock/st/st,quadfs.txt     |  6 +--
>>>>>    drivers/clk/st/clkgen-fsyn.c                       | 41 ++++++--------
>>>>>    drivers/clk/st/clkgen-mux.c                        | 28 ++++------
>>>>>    drivers/clk/st/clkgen-pll.c                        | 62 ++++++++++------------
>>>>>    7 files changed, 65 insertions(+), 87 deletions(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/clock/st/st,clkgen-mux.txt b/Documentation/devicetree/bindings/clock/st/st,clkgen-mux.txt
>>>>> index 4d277d6..9a46cb1d7 100644
>>>>> --- a/Documentation/devicetree/bindings/clock/st/st,clkgen-mux.txt
>>>>> +++ b/Documentation/devicetree/bindings/clock/st/st,clkgen-mux.txt
>>>>> @@ -10,7 +10,7 @@ This binding uses the common clock binding[1].
>>>>>    Required properties:
>>>>>    
>>>>>    - compatible : shall be:
>>>>> -     "st,stih407-clkgen-a9-mux",     "st,clkgen-mux"
>>>>> +     "st,stih407-clkgen-a9-mux"
>>>>>    
>>>>>    - #clock-cells : from common clock binding; shall be set to 0.
>>>>>    
>>>>> diff --git a/Documentation/devicetree/bindings/clock/st/st,clkgen-pll.txt b/Documentation/devicetree/bindings/clock/st/st,clkgen-pll.txt
>>>>> index c9fd674..be0b043 100644
>>>>> --- a/Documentation/devicetree/bindings/clock/st/st,clkgen-pll.txt
>>>>> +++ b/Documentation/devicetree/bindings/clock/st/st,clkgen-pll.txt
>>>>> @@ -9,11 +9,10 @@ Base address is located to the parent node. See clock binding[2]
>>>>>    Required properties:
>>>>>    
>>>>>    - compatible : shall be:
>>>>> -     "st,stih407-plls-c32-a0",       "st,clkgen-plls-c32"
>>>>> -     "st,stih407-plls-c32-a9",       "st,clkgen-plls-c32"
>>>>> -     "sst,plls-c32-cx_0",            "st,clkgen-plls-c32"
>>>>> -     "sst,plls-c32-cx_1",            "st,clkgen-plls-c32"
>>>>> -     "st,stih418-plls-c28-a9",       "st,clkgen-plls-c32"
>>>>> +     "st,clkgen-pll0"
>>>>> +     "st,clkgen-pll0"
>>>> Repeated. Supposed to be 0 and 1? This seems a bit generic, too.
>>>>
>>>>> +     "st,stih407-clkgen-plla9"
>>>>> +     "st,stih418-clkgen-plla9"