pinctrl: sh-pfc: Add helper to handle bias lookup table
commit c314c9f15aa5f43f0e5c0e2602cc65798dbd1598 upstream.
On some SoC there are no simple mapping of pins to bias register bits
and a lookup table is needed. This logic is already implemented in some
SoC specific drivers that could benefit from a generic implementation.
Add helpers to deal with the lookup which later can be used by the SoC
specific drivers. The logic used to lookup are different from the one it
aims to replace, this is intentional. This new method reduces the memory
consumption at the cost of increased CPU usage and fix a bug where a
WARN() would incorrectly be triggered if the register offset is 0.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/pinctrl/sh-pfc/core.h b/drivers/pinctrl/sh-pfc/core.h
index 0bbdea58..6d598dd 100644
--- a/drivers/pinctrl/sh-pfc/core.h
+++ b/drivers/pinctrl/sh-pfc/core.h
@@ -33,4 +33,8 @@
int sh_pfc_get_pin_index(struct sh_pfc *pfc, unsigned int pin);
int sh_pfc_config_mux(struct sh_pfc *pfc, unsigned mark, int pinmux_type);
+const struct sh_pfc_bias_info *
+sh_pfc_pin_to_bias_info(const struct sh_pfc_bias_info *info,
+ unsigned int num, unsigned int pin);
+
#endif /* __SH_PFC_CORE_H__ */