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pinctrl: renesas: Add generic support for pin group subsets

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It is fairly common for the pins in a pin group to be a subset of the
pins in another pin group.  Add a macro for defining a pin group that
refers to a subset of an array of pins.  This allows pin groups to share
pin data, and thus save memory.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/b56c4257aee1eab698bae2cf7a08aa05775c0a77.1640269757.git.geert+renesas@glider.be
This commit is contained in:
Geert Uytterhoeven 2021-12-23 15:41:15 +01:00
parent a0894be3e0
commit 49a7a27425
1 changed files with 12 additions and 0 deletions
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12
drivers/pinctrl/renesas/sh_pfc.h
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@ -58,6 +58,18 @@ struct sh_pfc_pin {
}
#define SH_PFC_PIN_GROUP(name) SH_PFC_PIN_GROUP_ALIAS(name, name)
/*
* Define a pin group referring to a subset of an array of pins.
*/
#define SH_PFC_PIN_GROUP_SUBSET(_name, data, first, n) { \
.name = #_name, \
.pins = data##_pins + first, \
.mux = data##_mux + first, \
.nr_pins = n + \
BUILD_BUG_ON_ZERO(first + n > ARRAY_SIZE(data##_pins)) + \
BUILD_BUG_ON_ZERO(first + n > ARRAY_SIZE(data##_mux)), \
}
struct sh_pfc_pin_group {
const char *name;
const unsigned int *pins;