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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>
This commit is contained in:
Laurent Pinchart 2013-04-08 11:36:13 +02:00 committed by Simon Horman
parent 7e1092b5a2
commit 11df28ab76
1 changed files with 2 additions and 0 deletions
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2
include/linux/platform_data/gpio-rcar.h
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@ -24,4 +24,6 @@ struct gpio_rcar_config {
unsigned has_both_edge_trigger:1;
};
#define RCAR_GP_PIN(bank, pin) (((bank) * 32) + (pin))
#endif /* __GPIO_RCAR_H__ */