This is a note to let you know that I've just added the patch titled
pinctrl: sh-pfc: Add helper to handle bias lookup table
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pinctrl-sh-pfc-add-helper-to-handle-bias-lookup-table.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c314c9f15aa5f43f0e5c0e2602cc65798dbd1598 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niklas=20S=C3=B6derlund?=
<niklas.soderlund+renesas@xxxxxxxxxxxx>
Date: Sat, 12 Nov 2016 17:04:25 +0100
Subject: pinctrl: sh-pfc: Add helper to handle bias lookup table
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pinctrl/sh-pfc/core.c | 15 +++++++++++++++
drivers/pinctrl/sh-pfc/core.h | 4 ++++
drivers/pinctrl/sh-pfc/sh_pfc.h | 6 ++++++
3 files changed, 25 insertions(+)
--- a/drivers/pinctrl/sh-pfc/core.c
+++ b/drivers/pinctrl/sh-pfc/core.c
@@ -389,6 +389,21 @@ int sh_pfc_config_mux(struct sh_pfc *pfc
return 0;
}
+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)
+{
+ unsigned int i;
+
+ for (i = 0; i < num; i++)
+ if (info[i].pin == pin)
+ return &info[i];
+
+ WARN_ONCE(1, "Pin %u is not in bias info list\n", pin);
+
+ return NULL;
+}
+
static int sh_pfc_init_ranges(struct sh_pfc *pfc)
{
struct sh_pfc_pin_range *range;
--- a/drivers/pinctrl/sh-pfc/core.h
+++ b/drivers/pinctrl/sh-pfc/core.h
@@ -33,4 +33,8 @@ void sh_pfc_write_reg(struct sh_pfc *pfc
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__ */
--- a/drivers/pinctrl/sh-pfc/sh_pfc.h
+++ b/drivers/pinctrl/sh-pfc/sh_pfc.h
@@ -189,6 +189,12 @@ struct sh_pfc_window {
unsigned long size;
};
+struct sh_pfc_bias_info {
+ u16 pin;
+ u16 reg : 11;
+ u16 bit : 5;
+};
+
struct sh_pfc_pin_range;
struct sh_pfc {
Patches currently in stable-queue which might be from niklas.soderlund+renesas@xxxxxxxxxxxx are
queue-4.9/pinctrl-sh-pfc-add-helper-to-handle-bias-lookup-table.patch
queue-4.9/pinctrl-sh-pfc-r8a7795-use-lookup-function-for-bias-data.patch
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