linux-kernel - Re: [PATCH 2/5] gpio: of: drop needless gpio_chip look-up in of_parse_own

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Message-ID: <CACRpkdZQpUTx2mpgt0U6u1RS9B-ZfMYHVNO_3iYYqCeVt=2rKg@mail.gmail.com>
Date:	Thu, 23 Jun 2016 09:34:51 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] gpio: of: drop needless gpio_chip look-up in of_parse_own_gpio()

On Tue, Jun 14, 2016 at 12:07 PM, Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:

> This function is doing more complicated than needed.  The caller of
> this function, of_gpiochip_scan_gpios() already knows the pointer to
> the gpio_chip.  It can pass it to of_parse_own_gpio() instead of
> looking up the gpio_chip by gpiochip_find().
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Patch applied!

First I was worried about this semantic change:

> -       chip_np = np->parent;
> +       chip_np = chip->of_node;

But then I read up on the code and saw that of_gpiochip_add() sets
it to the parent if not set before.

Yours,
Linus Walleij