linux-kernel - Re: [PATCH v3 2/4] pinctrl: meson: add a new dt parse callback for Meson-A series SoCs

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Message-ID: <1j1rv3vcsq.fsf@starbuckisacylon.baylibre.com>
Date:   Wed, 23 Oct 2019 14:58:29 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Qianggui Song <qianggui.song@...ogic.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Carlo Caione <carlo@...one.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Xingyu Chen <xingyu.chen@...ogic.com>,
        "Jianxin Pan" <jianxin.pan@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        "Mark Rutland" <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] pinctrl: meson: add a new dt parse callback for Meson-A series SoCs


On Wed 23 Oct 2019 at 14:33, Qianggui Song <qianggui.song@...ogic.com> wrote:

> On 2019/10/23 17:01, Jerome Brunet wrote:
>> 
>> On Mon 14 Oct 2019 at 12:54, Qianggui Song <qianggui.song@...ogic.com> wrote:
>> 
>>>
>>> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
>>> index 8bba9d053d9f..e8f6298fc96a 100644
>>> --- a/drivers/pinctrl/meson/pinctrl-meson.c
>>> +++ b/drivers/pinctrl/meson/pinctrl-meson.c
>>> @@ -695,6 +695,17 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
>>>  	return 0;
>>>  }
>>>  
>>> +int meson_pinctrl_parse_dt_extra(struct meson_pinctrl *pc,
>>> +				 struct device_node *node)
>> 
>> This function is the fixup for the a1 family, AFAICT.
>> It should be named as such and it belong in pinctrl-meson-a1.c
>> 
>> Every controller performing fixups should have their function as well:
>>  (1) AO of gxbb, gxl and axg 
>>  (2) AO of g12 and sm
>> 
> OK, Will try to move this function to pinctrl-meson-a1.c. That should be
> better than rewriting parse function for each chips EE/AO alone.
>>> +{
>>> +	int ret;
>>> +
>>> +	ret = meson_pinctrl_parse_dt(pc, node);
>> 
>> As said in previous review,  meson_pinctrl_parse_dt() should be called
>> for every SoC to parse the *available* regions.
>> 
>> The fixup, if necessary, will be done by providing a callback
>> 
>> IOW, please:
>>  * rework meson_pinctrl_parse_dt() to only parse the avaialble region
>>  * don't call meson_pinctrl_parse_dt() from the extra function
>>  * provided the extra function for the AO controllers of the other SoCs
>> 
> That means I need to move not only ao fixup but ds to extra function for
> old chips do not support this.But it will touch other Socs, should I do
> this in A1 pinctrl patchset? or do this rework in another patchset.

I don't there any problem doing in a single patchset.

For example, you can make a first that does the rework for the older SoCs
and add the "extra" mechanism then another one adding A1 support

>>> +	pc->reg_ds = pc->reg_pullen;
>>> +
>>> +	return ret;
>>> +}