[PATCH] mfd: da9052: Avoid setting read_flag_mask for da9052-i2c driver

[PATCH] mfd: da9052: Avoid setting read_flag_mask for da9052-i2c driver

[Axel Lin]

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@ingics.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

Re: [PATCH] mfd: da9052: Avoid setting read_flag_mask for da9052-i2c driver

[Lee Jones]

Steve, Adam,

> 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@ingics.com>
> ---
> Hi Adam and Steve,
> Any chance to test this patch?

** Look here **

> 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);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog

RE: [PATCH] mfd: da9052: Avoid setting read_flag_mask for da9052-i2c driver

[Opensource [Adam Thomson]]

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On August 28, 2014 12:21, Lee Jones wrote:

> Steve, Adam,
> 
> > 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@ingics.com>
> > ---
> > Hi Adam and Steve,
> > Any chance to test this patch?
> 
> ** Look here **

Lee, Axel,

This was on my to-do list but hadn't yet responded. Will try and find some time
in the next week to see if we can verify this.
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RE: [PATCH] mfd: da9052: Avoid setting read_flag_mask for da9052-i2c driver

[Opensource [Adam Thomson]]

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On August 28, 2014 14:38, Adam Thomson wrote:

> On August 28, 2014 12:21, Lee Jones wrote:
> 
> > Steve, Adam,
> >
> > > 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@ingics.com>
> > > ---
> > > Hi Adam and Steve,
> > > Any chance to test this patch?
> >
> > ** Look here **
> 
> Lee, Axel,
> 
> This was on my to-do list but hadn't yet responded. Will try and find some time
> in the next week to see if we can verify this.

Hi Axel, Lee,

I don't think I'm going to have time to test this soon. In terms of the change it looks fine to me, although I don't think you can run both SPI and I2C at the same time for this driver (I tried a quick test to instantiate both and saw issues with regulator initialisation for the second instance). Anyway, here's my ack for the change.

Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
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Re: [PATCH] mfd: da9052: Avoid setting read_flag_mask for da9052-i2c driver

[Lee Jones]

On Sat, 16 Aug 2014, Axel Lin wrote:

> 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@ingics.com>
> ---
> Hi Adam and Steve,

Applied with Adam's Ack.

> 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);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog