linux-kernel - Re: [PATCH v2 11/18] pinctrl: Add pinctrl driver for STM32 MCUs

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Date:	Tue, 10 Mar 2015 16:08:26 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	u.kleine-koenig@...gutronix.de, afaerber@...e.de,
	geert@...ux-m68k.org, Rob Herring <robh+dt@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Joe Perches <joe@...ches.com>, Antti Palosaari <crope@....fi>,
	Tejun Heo <tj@...nel.org>, Will Deacon <will.deacon@....com>,
	Nikolay Borisov <Nikolay.Borisov@....com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Kees Cook <keescook@...omium.org>,
	Michal Marek <mmarek@...e.cz>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-arch@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2 11/18] pinctrl: Add pinctrl driver for STM32 MCUs

On Friday 20 February 2015 19:01:10 Maxime Coquelin wrote:
> --- /dev/null
> +++ b/include/dt-bindings/pinctrl/pinctrl-stm32.h
> @@ -0,0 +1,43 @@
> +#ifndef _DT_BINDINGS_PINCTRL_STM32_H
> +#define _DT_BINDINGS_PINCTRL_STM32_H
> +
> +/* Modes */
> +#define IN             0
> +#define OUT            1
> +#define ALT            2
> +#define ANALOG         3

I think it's better to prefix all the names with a
string to identify what they are for, otherwise these
are way too generic.

> +/* Alternate functions */
> +#define ALT0           ((0 << 2) | ALT)
> +#define ALT1           ((1 << 2) | ALT)
> +#define ALT2           ((2 << 2) | ALT)
> +#define ALT3           ((3 << 2) | ALT)
> +#define ALT4           ((4 << 2) | ALT)
> +#define ALT5           ((5 << 2) | ALT)
> +#define ALT6           ((6 << 2) | ALT)
> +#define ALT7           ((7 << 2) | ALT)
> +#define ALT8           ((8 << 2) | ALT)
> +#define ALT9           ((9 << 2) | ALT)
> +#define ALT10          ((10 << 2) | ALT)
> +#define ALT11          ((11 << 2) | ALT)
> +#define ALT12          ((12 << 2) | ALT)
> +#define ALT13          ((13 << 2) | ALT)
> +#define ALT14          ((14 << 2) | ALT)
> +#define ALT15          ((15 << 2) | ALT)

You can have a single macro for these like

#define STM32_PIN_ALT(x) ((x << 2) | ALT)

> +/* Pull-Up/Down */
> +#define NO_PULL                0
> +#define PULL_UP                1
> +#define PULL_DOWN      2
> +
> +/* Type */
> +#define PUSH_PULL      (0 << 2)
> +#define OPEN_DRAIN     (1 << 2)
> +

These should probably not be stm32 specific at all, they sound
rather generic, so maybe put the definitions into a common file.



	Arnd
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