gpio-rcar: Add RCAR_GP_PIN macro

Pins are numbered in the R-Car family documentation using a bank number
and a pin number in the bank. As the Linux pin number space is linear,
we need to flatten this by multiplying the bank number by 32 and adding
the pin number. The resulting number bear no directly visible
relationship  to the documentation, making it error-prone.

Add a RCAR_GP_PIN macro to convert from the documentation pin number
space to the linear Linux space.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
[horms+renesas@verge.net.au: non-trivial rebase on top of
 "sh-pfc: r8a7779: Don't group USB OVC and PENC pins"]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/include/linux/platform_data/gpio-rcar.h b/include/linux/platform_data/gpio-rcar.h
index b253f77a7ddf6ba4db532cdbeeae43cf7b1e16df..cc472f6d8591dd00ed7ac4be6048948beeff3e96 100644 (file)
--- a/include/linux/platform_data/gpio-rcar.h
+++ b/include/linux/platform_data/gpio-rcar.h
@@ -23,4 +23,6 @@ struct gpio_rcar_config {
        const char *pctl_name;
 };
 
+#define RCAR_GP_PIN(bank, pin)         (((bank) * 32) + (pin))
+
 #endif /* __GPIO_RCAR_H__ */