[U-Boot] [PATCH 1/6] sunxi: GPIO: introduce sunxi_gpio_setup_dt_pins()

[Maxime Ripard <maxime.ripard@free-electrons.com>]

On Mon, Feb 27, 2017 at 12:26:40AM +0000, Andre Przywara wrote:
> Instead of hard-coding GPIO pins used for a certain peripheral, we
> should just use the pinctrl information from the DT.
> The sun8i-emac driver has some simple implementation of that, so
> let's just generalize this and move the code into a more common
> location.
> On the way we add support for the new, generic pinctrl binding now
> used by all Allwinner SoCs.
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
>  arch/arm/include/asm/arch-sunxi/gpio.h |  4 ++
>  arch/arm/mach-sunxi/pinmux.c           | 77 ++++++++++++++++++++++++++++++++++
>  2 files changed, 81 insertions(+)
> 
> diff --git a/arch/arm/include/asm/arch-sunxi/gpio.h b/arch/arm/include/asm/arch-sunxi/gpio.h
> index 85a4ec3..ba8c661 100644
> --- a/arch/arm/include/asm/arch-sunxi/gpio.h
> +++ b/arch/arm/include/asm/arch-sunxi/gpio.h
> @@ -239,4 +239,8 @@ int axp_gpio_init(void);
>  static inline int axp_gpio_init(void) { return 0; }
>  #endif
>  
> +int sunxi_gpio_parse_pin_name(const char *pin_name);
> +int sunxi_gpio_setup_dt_pins(const void * volatile fdt_blob, int node,
> +			     const char * mux_name, int mux_sel);
> +
>  #endif /* _SUNXI_GPIO_H */
> diff --git a/arch/arm/mach-sunxi/pinmux.c b/arch/arm/mach-sunxi/pinmux.c
> index b026f78..f1e1e8f 100644
> --- a/arch/arm/mach-sunxi/pinmux.c
> +++ b/arch/arm/mach-sunxi/pinmux.c
> @@ -9,6 +9,9 @@
>  #include <common.h>
>  #include <asm/io.h>
>  #include <asm/arch/gpio.h>
> +#include <fdtdec.h>
> +#include <fdt_support.h>
> +#include <dt-bindings/pinctrl/sun4i-a10.h>
>  
>  void sunxi_gpio_set_cfgbank(struct sunxi_gpio *pio, int bank_offset, u32 val)
>  {
> @@ -69,3 +72,77 @@ int sunxi_gpio_set_pull(u32 pin, u32 val)
>  
>  	return 0;
>  }
> +
> +int sunxi_gpio_parse_pin_name(const char *pin_name)
> +{
> +	int pin;
> +
> +	if (pin_name[0] != 'P')
> +		return -1;
> +
> +	if (pin_name[1] < 'A' || pin_name[1] > 'Z')
> +		return -1;
> +
> +	pin = (pin_name[1] - 'A') << 5;
> +	pin += simple_strtol(&pin_name[2], NULL, 10);
> +
> +	return pin;
> +}

That function already exists, sunxi_name_to_gpio.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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