linux-kernel - [PATCH] mfd: da9052: Avoid setting read_flag

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Date:	Sat, 16 Aug 2014 21:23:40 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	"Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>,
	"Opensource [Adam Thomson]" <Adam.Thomson.Opensource@...semi.com>,
	Support Opensource <support.opensource@...semi.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] mfd: da9052: Avoid setting read_flag_mask for da9052-i2c
 driver

Current code init regmap with &da9052_regmap_config for both da9052-spi and
da9052-i2c drivers. da9052-spi sets the read_flag_mask.
The same setting may be applied for da9052-i2c if da9052-spi driver is loaded
first because they actually use the same regmap_config setting.
Fix this issue by using a local variable for regmap_config in da9052-spi driver,
so the settings in spi driver won't impact the settings in i2c driver.
Also makes da9052_regmap_config const to avoid similar issue.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
Hi Adam and Steve,
Any chance to test this patch?

Thanks,
Axel
 drivers/mfd/da9052-core.c         | 2 +-
 drivers/mfd/da9052-spi.c          | 7 ++++---
 include/linux/mfd/da9052/da9052.h | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c
index e8af816..52a0c2f 100644
--- a/drivers/mfd/da9052-core.c
+++ b/drivers/mfd/da9052-core.c
@@ -522,7 +522,7 @@ static const struct mfd_cell da9052_subdev_info[] = {
 	},
 };
 
-struct regmap_config da9052_regmap_config = {
+const struct regmap_config da9052_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 
diff --git a/drivers/mfd/da9052-spi.c b/drivers/mfd/da9052-spi.c
index 17666b4..45ae0b7 100644
--- a/drivers/mfd/da9052-spi.c
+++ b/drivers/mfd/da9052-spi.c
@@ -23,6 +23,7 @@
 
 static int da9052_spi_probe(struct spi_device *spi)
 {
+	struct regmap_config config;
 	int ret;
 	const struct spi_device_id *id = spi_get_device_id(spi);
 	struct da9052 *da9052;
@@ -40,10 +41,10 @@ static int da9052_spi_probe(struct spi_device *spi)
 
 	spi_set_drvdata(spi, da9052);
 
-	da9052_regmap_config.read_flag_mask = 1;
-	da9052_regmap_config.write_flag_mask = 0;
+	config = da9052_regmap_config;
+	config.read_flag_mask = 1;
 
-	da9052->regmap = devm_regmap_init_spi(spi, &da9052_regmap_config);
+	da9052->regmap = devm_regmap_init_spi(spi, &config);
 	if (IS_ERR(da9052->regmap)) {
 		ret = PTR_ERR(da9052->regmap);
 		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
index bba65f5..c18a4c1 100644
--- a/include/linux/mfd/da9052/da9052.h
+++ b/include/linux/mfd/da9052/da9052.h
@@ -211,7 +211,7 @@ static inline int da9052_reg_update(struct da9052 *da9052, unsigned char reg,
 int da9052_device_init(struct da9052 *da9052, u8 chip_id);
 void da9052_device_exit(struct da9052 *da9052);
 
-extern struct regmap_config da9052_regmap_config;
+extern const struct regmap_config da9052_regmap_config;
 
 int da9052_irq_init(struct da9052 *da9052);
 int da9052_irq_exit(struct da9052 *da9052);
-- 
1.9.1



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