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

Arnd Bergmann
2015-03-10T15:10:28Z

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