linux-kernel - Re: [PATCH v3] gpio: UniPhier: add driver for UniPhier GPIO controller

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Date:	Fri, 20 May 2016 13:30:10 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Alexandre Courbot <gnurou@...il.com>
Subject: Re: [PATCH v3] gpio: UniPhier: add driver for UniPhier GPIO controller

Hi Linus,


2015-07-16 16:48 GMT+09:00 Masahiro Yamada <yamada.masahiro@...ionext.com>:
> Hi Linus,

>
> OK, I will do it in v4.


I has been away from my GPIO driver upstreaming
for a long time for some reason.

I sent v3 ten months ago.
http://patchwork.ozlabs.org/patch/494860/


In the meantime, there have been various updates
in the GPIO frame-work.

So, I'd like to know the recommended driver coding style
based on 4.7-rc1.


Diving into the git-log so far, I came up the following list:

[1] The "dev" member of gpiochip was renamed to "parent"

[2] The most recommended register function is now
    devm_gpiochip_add_data()

[3] Pass the driver private data to the
    3rd argument of devm_gpiochip_add_data().

[4] Do not use container_of() to covert
    from gpiochip to driver private data.
    Instead, gpiochip_get_data() should be used.

    (I used of_mm_gpio_chip in v3,
     but I needed to use container_of() to
     convert from gpiochip to of_mm_gpio_chip.
     I am wondering if you are happy with it or not.)

[5] gpiochip.owner is being deprecated.
    So, platform drivers need not set
     "gpiochip.owner =  THIS_MODULE".


Correct?
Is there anything else missing?

Any advice is appreciated.


-- 
Best Regards
Masahiro Yamada