RE: [PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver
Hi Tomasz,
>
> Hi Pankaj,
>
> On 10.05.2014 09:20, Pankaj Dubey wrote:
> > Let's handle i2c interrupt re-configuration in i2c driver. This will
> > help us in removing some soc specific checks from machine files.
> > Since only Exynos5250, and Exynos5420 need to do this, added syscon
> > based phandle to i2c device nodes of respective SoC DT files.
> > Also handle saving and restoring of SYS_I2C_CFG register during
> > suspend and resume of i2c driver. This will help in removing soc
> > specific check from mach-exynos/pm.c.
> >
> > CC: Rob Herring
> > CC: Randy Dunlap
> > CC: Wolfram Sang
> > CC: Russell King
> > CC: devicet...@vger.kernel.org
> > CC: linux-...@vger.kernel.org
> > CC: linux-...@vger.kernel.org
> > Signed-off-by: Pankaj Dubey
> > ---
> > .../devicetree/bindings/arm/samsung/sysreg.txt |1 +
> > arch/arm/boot/dts/exynos5.dtsi |5 +++
> > arch/arm/boot/dts/exynos5250.dtsi |4 +++
> > arch/arm/boot/dts/exynos5420.dtsi |4 +++
>
> What about Exynos5410 and Exynos5800?
OK, I will check user manuals of these two SoCs and if required will update.
>
> > drivers/i2c/busses/i2c-s3c2410.c | 32
>
> > 5 files changed, 46 insertions(+)
>
> [snip]
>
> > diff --git a/drivers/i2c/busses/i2c-s3c2410.c
> > b/drivers/i2c/busses/i2c-s3c2410.c
> > index ae44910..e707062 100644
> > --- a/drivers/i2c/busses/i2c-s3c2410.c
> > +++ b/drivers/i2c/busses/i2c-s3c2410.c
> > @@ -39,6 +39,8 @@
> > #include
> > #include
> > #include
> > +#include
> > +#include
> >
> > #include
> >
> > @@ -91,6 +93,9 @@
> > /* Max time to wait for bus to become idle after a xfer (in us) */
> > #define S3C2410_IDLE_TIMEOUT 5000
> >
> > +/* Exynos5 Sysreg offset */
> > +#define EXYNOS5_SYS_I2C_CFG0x0234
> > +
> > /* i2c controller state */
> > enum s3c24xx_i2c_state {
> > STATE_IDLE,
> > @@ -127,6 +132,8 @@ struct s3c24xx_i2c { #if
> > defined(CONFIG_ARM_S3C24XX_CPUFREQ)
> > struct notifier_block freq_transition;
> > #endif
> > + struct regmap *sysreg;
> > + unsigned intsys_i2s_cfg;
>
> typo: s/i2s/i2c/
Oops, sorry I will correct this.
>
> > };
> >
> > static struct platform_device_id s3c24xx_driver_ids[] = { @@ -1075,6
> > +1082,8 @@ static void s3c24xx_i2c_parse_dt(struct device_node *np,
> > struct s3c24xx_i2c *i2c) {
> > struct s3c2410_platform_i2c *pdata = i2c->pdata;
> > + u32 val = 0;
> > + int id;
> >
> > if (!np)
> > return;
> > @@ -1084,6 +1093,23 @@ s3c24xx_i2c_parse_dt(struct device_node *np,
struct
> s3c24xx_i2c *i2c)
> > of_property_read_u32(np, "samsung,i2c-slave-addr",
>slave_addr);
> > of_property_read_u32(np, "samsung,i2c-max-bus-freq",
> > (u32 *)>frequency);
> > + /*
> > +* Exynos5's legacy i2c controller and new high speed i2c
> > +* controller have muxed interrupt sources. By default the
>
> What do you mean by "by default"? Is it a setting from the bootloader or
reset value?
>
It's a reset value.
> Probably to ensure that the mux is set correctly, same thing should be
also added to
> hsi2c driver.
>
> > +* interrupts for 4-channel HS-I2C controller are enabled.
> > +* If node for first four channels of legacy i2c controller
> > +* are available then re-configure the interrupts via the
> > +* system register.
> > +*/
> > + id = of_alias_get_id(np, "i2c");
> > + i2c->sysreg = syscon_regmap_lookup_by_phandle(np,
> > + "samsung,syscon-phandle");
> > + if (IS_ERR(i2c->sysreg)) {
> > + /* As this is not compulsory do not return error */
> > + pr_info("i2c-%d skipping re-configuration of interrutps\n",
id);
> > + return;
> > + }
> > + regmap_update_bits(i2c->sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), val);
>
> As Wolfram pointed, val can be replaced with immediate 0 here.
OK, I will take care as per suggestion.
>
> > }
> > #else
> > static void
> > @@ -1268,6 +1294,9 @@ static int s3c24xx_i2c_suspend_noirq(struct
> > device *dev)
> >
> > i2c->suspended = 1;
> >
> > + if (!IS_ERR(i2c->sysreg))
> > + regmap_read(i2c->sysreg, EXYNOS5_SYS_I2C_CFG,
> >sys_i2s_cfg);
> > +
> > return 0;
> > }
> >
> > @@ -1276,6 +1305,9 @@ static int s3c24xx_i2c_resume(struct device *dev)
> > struct platform_device *pdev = to_platform_device(dev);
> > struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
> >
> > + if (!IS_ERR(i2c->sysreg))
> > + regmap_write(i2c->sysreg, i2c->sys_i2s_cfg,
> EXYNOS5_SYS_I2C_CFG);
>
> According to include/linux/regmap.h:
>
> int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
>
> So in your code reg is swapped with val.
Yes. I will correct this.
>
> Best regards,
> Tomasz
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RE: [PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver
Hi Tomasz,
Hi Pankaj,
On 10.05.2014 09:20, Pankaj Dubey wrote:
Let's handle i2c interrupt re-configuration in i2c driver. This will
help us in removing some soc specific checks from machine files.
Since only Exynos5250, and Exynos5420 need to do this, added syscon
based phandle to i2c device nodes of respective SoC DT files.
Also handle saving and restoring of SYS_I2C_CFG register during
suspend and resume of i2c driver. This will help in removing soc
specific check from mach-exynos/pm.c.
CC: Rob Herring robh...@kernel.org
CC: Randy Dunlap rdun...@infradead.org
CC: Wolfram Sang w...@the-dreams.de
CC: Russell King li...@arm.linux.org.uk
CC: devicet...@vger.kernel.org
CC: linux-...@vger.kernel.org
CC: linux-...@vger.kernel.org
Signed-off-by: Pankaj Dubey pankaj.du...@samsung.com
---
.../devicetree/bindings/arm/samsung/sysreg.txt |1 +
arch/arm/boot/dts/exynos5.dtsi |5 +++
arch/arm/boot/dts/exynos5250.dtsi |4 +++
arch/arm/boot/dts/exynos5420.dtsi |4 +++
What about Exynos5410 and Exynos5800?
OK, I will check user manuals of these two SoCs and if required will update.
drivers/i2c/busses/i2c-s3c2410.c | 32
5 files changed, 46 insertions(+)
[snip]
diff --git a/drivers/i2c/busses/i2c-s3c2410.c
b/drivers/i2c/busses/i2c-s3c2410.c
index ae44910..e707062 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -39,6 +39,8 @@
#include linux/of.h
#include linux/of_gpio.h
#include linux/pinctrl/consumer.h
+#include linux/mfd/syscon.h
+#include linux/regmap.h
#include asm/irq.h
@@ -91,6 +93,9 @@
/* Max time to wait for bus to become idle after a xfer (in us) */
#define S3C2410_IDLE_TIMEOUT 5000
+/* Exynos5 Sysreg offset */
+#define EXYNOS5_SYS_I2C_CFG0x0234
+
/* i2c controller state */
enum s3c24xx_i2c_state {
STATE_IDLE,
@@ -127,6 +132,8 @@ struct s3c24xx_i2c { #if
defined(CONFIG_ARM_S3C24XX_CPUFREQ)
struct notifier_block freq_transition;
#endif
+ struct regmap *sysreg;
+ unsigned intsys_i2s_cfg;
typo: s/i2s/i2c/
Oops, sorry I will correct this.
};
static struct platform_device_id s3c24xx_driver_ids[] = { @@ -1075,6
+1082,8 @@ static void s3c24xx_i2c_parse_dt(struct device_node *np,
struct s3c24xx_i2c *i2c) {
struct s3c2410_platform_i2c *pdata = i2c-pdata;
+ u32 val = 0;
+ int id;
if (!np)
return;
@@ -1084,6 +1093,23 @@ s3c24xx_i2c_parse_dt(struct device_node *np,
struct
s3c24xx_i2c *i2c)
of_property_read_u32(np, samsung,i2c-slave-addr,
pdata-slave_addr);
of_property_read_u32(np, samsung,i2c-max-bus-freq,
(u32 *)pdata-frequency);
+ /*
+* Exynos5's legacy i2c controller and new high speed i2c
+* controller have muxed interrupt sources. By default the
What do you mean by by default? Is it a setting from the bootloader or
reset value?
It's a reset value.
Probably to ensure that the mux is set correctly, same thing should be
also added to
hsi2c driver.
+* interrupts for 4-channel HS-I2C controller are enabled.
+* If node for first four channels of legacy i2c controller
+* are available then re-configure the interrupts via the
+* system register.
+*/
+ id = of_alias_get_id(np, i2c);
+ i2c-sysreg = syscon_regmap_lookup_by_phandle(np,
+ samsung,syscon-phandle);
+ if (IS_ERR(i2c-sysreg)) {
+ /* As this is not compulsory do not return error */
+ pr_info(i2c-%d skipping re-configuration of interrutps\n,
id);
+ return;
+ }
+ regmap_update_bits(i2c-sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), val);
As Wolfram pointed, val can be replaced with immediate 0 here.
OK, I will take care as per suggestion.
}
#else
static void
@@ -1268,6 +1294,9 @@ static int s3c24xx_i2c_suspend_noirq(struct
device *dev)
i2c-suspended = 1;
+ if (!IS_ERR(i2c-sysreg))
+ regmap_read(i2c-sysreg, EXYNOS5_SYS_I2C_CFG, i2c-
sys_i2s_cfg);
+
return 0;
}
@@ -1276,6 +1305,9 @@ static int s3c24xx_i2c_resume(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
+ if (!IS_ERR(i2c-sysreg))
+ regmap_write(i2c-sysreg, i2c-sys_i2s_cfg,
EXYNOS5_SYS_I2C_CFG);
According to include/linux/regmap.h:
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
So in your code reg is swapped with val.
Yes. I will correct this.
Best regards,
Tomasz
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Re: [PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver
Hi Pankaj,
On 10.05.2014 09:20, Pankaj Dubey wrote:
> Let's handle i2c interrupt re-configuration in i2c driver. This will
> help us in removing some soc specific checks from machine files.
> Since only Exynos5250, and Exynos5420 need to do this, added syscon
> based phandle to i2c device nodes of respective SoC DT files.
> Also handle saving and restoring of SYS_I2C_CFG register during
> suspend and resume of i2c driver. This will help in removing soc
> specific check from mach-exynos/pm.c.
>
> CC: Rob Herring
> CC: Randy Dunlap
> CC: Wolfram Sang
> CC: Russell King
> CC: devicet...@vger.kernel.org
> CC: linux-...@vger.kernel.org
> CC: linux-...@vger.kernel.org
> Signed-off-by: Pankaj Dubey
> ---
> .../devicetree/bindings/arm/samsung/sysreg.txt |1 +
> arch/arm/boot/dts/exynos5.dtsi |5 +++
> arch/arm/boot/dts/exynos5250.dtsi |4 +++
> arch/arm/boot/dts/exynos5420.dtsi |4 +++
What about Exynos5410 and Exynos5800?
> drivers/i2c/busses/i2c-s3c2410.c | 32
>
> 5 files changed, 46 insertions(+)
[snip]
> diff --git a/drivers/i2c/busses/i2c-s3c2410.c
> b/drivers/i2c/busses/i2c-s3c2410.c
> index ae44910..e707062 100644
> --- a/drivers/i2c/busses/i2c-s3c2410.c
> +++ b/drivers/i2c/busses/i2c-s3c2410.c
> @@ -39,6 +39,8 @@
> #include
> #include
> #include
> +#include
> +#include
>
> #include
>
> @@ -91,6 +93,9 @@
> /* Max time to wait for bus to become idle after a xfer (in us) */
> #define S3C2410_IDLE_TIMEOUT 5000
>
> +/* Exynos5 Sysreg offset */
> +#define EXYNOS5_SYS_I2C_CFG 0x0234
> +
> /* i2c controller state */
> enum s3c24xx_i2c_state {
> STATE_IDLE,
> @@ -127,6 +132,8 @@ struct s3c24xx_i2c {
> #if defined(CONFIG_ARM_S3C24XX_CPUFREQ)
> struct notifier_block freq_transition;
> #endif
> + struct regmap *sysreg;
> + unsigned intsys_i2s_cfg;
typo: s/i2s/i2c/
> };
>
> static struct platform_device_id s3c24xx_driver_ids[] = {
> @@ -1075,6 +1082,8 @@ static void
> s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
> {
> struct s3c2410_platform_i2c *pdata = i2c->pdata;
> + u32 val = 0;
> + int id;
>
> if (!np)
> return;
> @@ -1084,6 +1093,23 @@ s3c24xx_i2c_parse_dt(struct device_node *np, struct
> s3c24xx_i2c *i2c)
> of_property_read_u32(np, "samsung,i2c-slave-addr", >slave_addr);
> of_property_read_u32(np, "samsung,i2c-max-bus-freq",
> (u32 *)>frequency);
> + /*
> + * Exynos5's legacy i2c controller and new high speed i2c
> + * controller have muxed interrupt sources. By default the
What do you mean by "by default"? Is it a setting from the bootloader or
reset value?
Probably to ensure that the mux is set correctly, same thing should be
also added to hsi2c driver.
> + * interrupts for 4-channel HS-I2C controller are enabled.
> + * If node for first four channels of legacy i2c controller
> + * are available then re-configure the interrupts via the
> + * system register.
> + */
> + id = of_alias_get_id(np, "i2c");
> + i2c->sysreg = syscon_regmap_lookup_by_phandle(np,
> + "samsung,syscon-phandle");
> + if (IS_ERR(i2c->sysreg)) {
> + /* As this is not compulsory do not return error */
> + pr_info("i2c-%d skipping re-configuration of interrutps\n", id);
> + return;
> + }
> + regmap_update_bits(i2c->sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), val);
As Wolfram pointed, val can be replaced with immediate 0 here.
> }
> #else
> static void
> @@ -1268,6 +1294,9 @@ static int s3c24xx_i2c_suspend_noirq(struct device *dev)
>
> i2c->suspended = 1;
>
> + if (!IS_ERR(i2c->sysreg))
> + regmap_read(i2c->sysreg, EXYNOS5_SYS_I2C_CFG,
> >sys_i2s_cfg);
> +
> return 0;
> }
>
> @@ -1276,6 +1305,9 @@ static int s3c24xx_i2c_resume(struct device *dev)
> struct platform_device *pdev = to_platform_device(dev);
> struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
>
> + if (!IS_ERR(i2c->sysreg))
> + regmap_write(i2c->sysreg, i2c->sys_i2s_cfg,
> EXYNOS5_SYS_I2C_CFG);
According to include/linux/regmap.h:
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
So in your code reg is swapped with val.
Best regards,
Tomasz
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Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver
Hi Pankaj,
On 10.05.2014 09:20, Pankaj Dubey wrote:
Let's handle i2c interrupt re-configuration in i2c driver. This will
help us in removing some soc specific checks from machine files.
Since only Exynos5250, and Exynos5420 need to do this, added syscon
based phandle to i2c device nodes of respective SoC DT files.
Also handle saving and restoring of SYS_I2C_CFG register during
suspend and resume of i2c driver. This will help in removing soc
specific check from mach-exynos/pm.c.
CC: Rob Herring robh...@kernel.org
CC: Randy Dunlap rdun...@infradead.org
CC: Wolfram Sang w...@the-dreams.de
CC: Russell King li...@arm.linux.org.uk
CC: devicet...@vger.kernel.org
CC: linux-...@vger.kernel.org
CC: linux-...@vger.kernel.org
Signed-off-by: Pankaj Dubey pankaj.du...@samsung.com
---
.../devicetree/bindings/arm/samsung/sysreg.txt |1 +
arch/arm/boot/dts/exynos5.dtsi |5 +++
arch/arm/boot/dts/exynos5250.dtsi |4 +++
arch/arm/boot/dts/exynos5420.dtsi |4 +++
What about Exynos5410 and Exynos5800?
drivers/i2c/busses/i2c-s3c2410.c | 32
5 files changed, 46 insertions(+)
[snip]
diff --git a/drivers/i2c/busses/i2c-s3c2410.c
b/drivers/i2c/busses/i2c-s3c2410.c
index ae44910..e707062 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -39,6 +39,8 @@
#include linux/of.h
#include linux/of_gpio.h
#include linux/pinctrl/consumer.h
+#include linux/mfd/syscon.h
+#include linux/regmap.h
#include asm/irq.h
@@ -91,6 +93,9 @@
/* Max time to wait for bus to become idle after a xfer (in us) */
#define S3C2410_IDLE_TIMEOUT 5000
+/* Exynos5 Sysreg offset */
+#define EXYNOS5_SYS_I2C_CFG 0x0234
+
/* i2c controller state */
enum s3c24xx_i2c_state {
STATE_IDLE,
@@ -127,6 +132,8 @@ struct s3c24xx_i2c {
#if defined(CONFIG_ARM_S3C24XX_CPUFREQ)
struct notifier_block freq_transition;
#endif
+ struct regmap *sysreg;
+ unsigned intsys_i2s_cfg;
typo: s/i2s/i2c/
};
static struct platform_device_id s3c24xx_driver_ids[] = {
@@ -1075,6 +1082,8 @@ static void
s3c24xx_i2c_parse_dt(struct device_node *np, struct s3c24xx_i2c *i2c)
{
struct s3c2410_platform_i2c *pdata = i2c-pdata;
+ u32 val = 0;
+ int id;
if (!np)
return;
@@ -1084,6 +1093,23 @@ s3c24xx_i2c_parse_dt(struct device_node *np, struct
s3c24xx_i2c *i2c)
of_property_read_u32(np, samsung,i2c-slave-addr, pdata-slave_addr);
of_property_read_u32(np, samsung,i2c-max-bus-freq,
(u32 *)pdata-frequency);
+ /*
+ * Exynos5's legacy i2c controller and new high speed i2c
+ * controller have muxed interrupt sources. By default the
What do you mean by by default? Is it a setting from the bootloader or
reset value?
Probably to ensure that the mux is set correctly, same thing should be
also added to hsi2c driver.
+ * interrupts for 4-channel HS-I2C controller are enabled.
+ * If node for first four channels of legacy i2c controller
+ * are available then re-configure the interrupts via the
+ * system register.
+ */
+ id = of_alias_get_id(np, i2c);
+ i2c-sysreg = syscon_regmap_lookup_by_phandle(np,
+ samsung,syscon-phandle);
+ if (IS_ERR(i2c-sysreg)) {
+ /* As this is not compulsory do not return error */
+ pr_info(i2c-%d skipping re-configuration of interrutps\n, id);
+ return;
+ }
+ regmap_update_bits(i2c-sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), val);
As Wolfram pointed, val can be replaced with immediate 0 here.
}
#else
static void
@@ -1268,6 +1294,9 @@ static int s3c24xx_i2c_suspend_noirq(struct device *dev)
i2c-suspended = 1;
+ if (!IS_ERR(i2c-sysreg))
+ regmap_read(i2c-sysreg, EXYNOS5_SYS_I2C_CFG,
i2c-sys_i2s_cfg);
+
return 0;
}
@@ -1276,6 +1305,9 @@ static int s3c24xx_i2c_resume(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
+ if (!IS_ERR(i2c-sysreg))
+ regmap_write(i2c-sysreg, i2c-sys_i2s_cfg,
EXYNOS5_SYS_I2C_CFG);
According to include/linux/regmap.h:
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
So in your code reg is swapped with val.
Best regards,
Tomasz
--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
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Re: [PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver
On Sat, May 10, 2014 at 04:20:14PM +0900, Pankaj Dubey wrote: > Let's handle i2c interrupt re-configuration in i2c driver. This will > help us in removing some soc specific checks from machine files. > Since only Exynos5250, and Exynos5420 need to do this, added syscon > based phandle to i2c device nodes of respective SoC DT files. > Also handle saving and restoring of SYS_I2C_CFG register during > suspend and resume of i2c driver. This will help in removing soc > specific check from mach-exynos/pm.c. > > CC: Rob Herring > CC: Randy Dunlap > CC: Wolfram Sang > CC: Russell King > CC: devicet...@vger.kernel.org > CC: linux-...@vger.kernel.org > CC: linux-...@vger.kernel.org > Signed-off-by: Pankaj Dubey Shall this go via i2c-tree? Looks to me like it should go with the rest of the series? Patch is mostly okay (only reviewed the code, not the bindings), one nit: > + regmap_update_bits(i2c->sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), val); Hardcode the '0' and drop using 'val'? signature.asc Description: Digital signature
Re: [PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver
On Sat, May 10, 2014 at 04:20:14PM +0900, Pankaj Dubey wrote: Let's handle i2c interrupt re-configuration in i2c driver. This will help us in removing some soc specific checks from machine files. Since only Exynos5250, and Exynos5420 need to do this, added syscon based phandle to i2c device nodes of respective SoC DT files. Also handle saving and restoring of SYS_I2C_CFG register during suspend and resume of i2c driver. This will help in removing soc specific check from mach-exynos/pm.c. CC: Rob Herring robh...@kernel.org CC: Randy Dunlap rdun...@infradead.org CC: Wolfram Sang w...@the-dreams.de CC: Russell King li...@arm.linux.org.uk CC: devicet...@vger.kernel.org CC: linux-...@vger.kernel.org CC: linux-...@vger.kernel.org Signed-off-by: Pankaj Dubey pankaj.du...@samsung.com Shall this go via i2c-tree? Looks to me like it should go with the rest of the series? Patch is mostly okay (only reviewed the code, not the bindings), one nit: + regmap_update_bits(i2c-sysreg, EXYNOS5_SYS_I2C_CFG, BIT(id), val); Hardcode the '0' and drop using 'val'? signature.asc Description: Digital signature
