From: Jerome Brunet <jbrunet@baylibre.com>
To: Qianggui Song <qianggui.song@amlogic.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Hanjie Lin <hanjie.lin@amlogic.com>,
Jianxin Pan <jianxin.pan@amlogic.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Kevin Hilman <khilman@baylibre.com>,
Linus Walleij <linus.walleij@linaro.org>,
linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org,
Rob Herring <robh+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Carlo Caione <carlo@caione.org>,
linux-amlogic@lists.infradead.org,
Xingyu Chen <xingyu.chen@amlogic.com>
Subject: Re: [PATCH 2/3] pinctrl: meson-a1: add pinctrl driver for Meson A1 Soc
Date: Tue, 17 Sep 2019 16:07:34 +0200 [thread overview]
Message-ID: <1j8sqn3tjt.fsf@starbuckisacylon.baylibre.com> (raw)
In-Reply-To: <73dc56bd-d6c5-1de7-e97e-91479a89a29e@amlogic.com>
On Tue 17 Sep 2019 at 13:51, Qianggui Song <qianggui.song@amlogic.com> wrote:
>>> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
>>> index 8bba9d0..885b89d 100644
>>> --- a/drivers/pinctrl/meson/pinctrl-meson.c
>>> +++ b/drivers/pinctrl/meson/pinctrl-meson.c
>>> @@ -688,8 +688,12 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc,
>>>
>>> pc->reg_ds = meson_map_resource(pc, gpio_np, "ds");
>>> if (IS_ERR(pc->reg_ds)) {
>>> - dev_dbg(pc->dev, "ds registers not found - skipping\n");
>>> - pc->reg_ds = NULL;
>>> + if (pc->data->reg_layout == A1_LAYOUT) {
>>> + pc->reg_ds = pc->reg_pullen;
>>
>> IMO, this kind of ID based init fixup is not going to scale and will
>> lead to something difficult to maintain in the end.
>>
>> The way the different register sets interract with each other is already
>> pretty complex to follow.
>>
>> You could rework this in 2 different ways:
>> #1 - Have the generic function parse all the register sets and have all
>> drivers provide a specific (as in gxbb, gxl, axg, etc ...) function to :
>> - Verify the expected sets have been provided
>> - Make assignement fixup as above if necessary
>>
>> #2 - Rework the driver to have only one single register region
>> I think one of your colleague previously mentionned this was not
>> possible. It is still unclear to me why ...
>>
> Appreciate your advice. I have an idea based on #1, how about providing
> only two dt parse function, one is for chips before A1(the old one),
> another is for A1 and later chips that share the same layout. Assign
> these two functions to their own driver.
That's roughly the same thing as your initial proposition with function
pointer instead of IDs ... IMO, this would still be a quick fix to
address your immediate topic instead of dealing with the driver as
whole, which is my concern here.
>>> + } else {
>>> + dev_dbg(pc->dev, "ds registers not found - skipping\n");
>>> + pc->reg_ds = NULL;
>>> + }
>>> }
>>>
>>> return 0;
>>> diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h
>>> index c696f32..3d0c58d 100644
>>> --- a/drivers/pinctrl/meson/pinctrl-meson.h
>>> +++ b/drivers/pinctrl/meson/pinctrl-meson.h
>>> @@ -80,6 +80,14 @@ enum meson_pinconf_drv {
>>> };
>>>
>>> /**
>>> + * enum meson_reg_layout - identify two types of reg layout
>>> + */
>>> +enum meson_reg_layout {
>>> + LEGACY_LAYOUT,
>>> + A1_LAYOUT,
>>> +};
>>> +
>>> +/**
>>> * struct meson bank
>>> *
>>> * @name: bank name
>>> @@ -114,6 +122,7 @@ struct meson_pinctrl_data {
>>> unsigned int num_banks;
>>> const struct pinmux_ops *pmx_ops;
>>> void *pmx_data;
>>> + unsigned int reg_layout;
>>> };
>>>
>>> struct meson_pinctrl {
>>
>> .
>>
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next prev parent reply other threads:[~2019-09-17 14:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-17 6:07 [PATCH 0/3] pinctrl: meson-a1: add pinctrl driver Qianggui Song
2019-09-17 6:07 ` [PATCH 1/3] pinctrl: add compatible for Amlogic Meson A1 pin controller Qianggui Song
2019-09-17 7:18 ` Neil Armstrong
2019-09-17 10:29 ` Qianggui Song
2019-09-30 22:47 ` Rob Herring
2019-09-17 6:07 ` [PATCH 2/3] pinctrl: meson-a1: add pinctrl driver for Meson A1 Soc Qianggui Song
2019-09-17 7:15 ` Neil Armstrong
2019-09-17 10:59 ` Qianggui Song
2019-09-17 9:29 ` Jerome Brunet
2019-09-17 11:51 ` Qianggui Song
2019-09-17 14:07 ` Jerome Brunet [this message]
2019-09-18 6:36 ` Qianggui Song
2019-09-19 16:26 ` Jerome Brunet
2019-09-23 7:29 ` Qianggui Song
2019-09-17 6:07 ` [PATCH 3/3] arm64: dts: meson: a1: add pinctrl controller support Qianggui Song
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