[PATCH v3 1/6] i2c: s3c2410: Handle i2c sys_cfg register in i2c driver
Pankaj Dubey
pankaj.dubey at samsung.com
Sat May 10 00:20:14 PDT 2014
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+dt at kernel.org>
CC: Randy Dunlap <rdunlap at infradead.org>
CC: Wolfram Sang <wsa at the-dreams.de>
CC: Russell King <linux at arm.linux.org.uk>
CC: devicetree at vger.kernel.org
CC: linux-doc at vger.kernel.org
CC: linux-i2c at vger.kernel.org
Signed-off-by: Pankaj Dubey <pankaj.dubey at 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 +++
drivers/i2c/busses/i2c-s3c2410.c | 32 ++++++++++++++++++++
5 files changed, 46 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/samsung/sysreg.txt b/Documentation/devicetree/bindings/arm/samsung/sysreg.txt
index 0ab3251..fd71581 100644
--- a/Documentation/devicetree/bindings/arm/samsung/sysreg.txt
+++ b/Documentation/devicetree/bindings/arm/samsung/sysreg.txt
@@ -3,6 +3,7 @@ SAMSUNG S5P/Exynos SoC series System Registers (SYSREG)
Properties:
- compatible : should contain "samsung,<chip name>-sysreg", "syscon";
For Exynos4 SoC series it should be "samsung,exynos4-sysreg", "syscon";
+ For Exynos5 SoC series it should be "samsung,exynos5-sysreg", "syscon";
- reg : offset and length of the register set.
Example:
diff --git a/arch/arm/boot/dts/exynos5.dtsi b/arch/arm/boot/dts/exynos5.dtsi
index 79d0608..3027e37 100644
--- a/arch/arm/boot/dts/exynos5.dtsi
+++ b/arch/arm/boot/dts/exynos5.dtsi
@@ -99,4 +99,9 @@
#size-cells = <0>;
status = "disabled";
};
+
+ sys_reg: syscon at 10050000 {
+ compatible = "samsung,exynos5-sysreg", "syscon";
+ reg = <0x10050000 0x400>;
+ };
};
diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi
index 8d724d5..46f0233 100644
--- a/arch/arm/boot/dts/exynos5250.dtsi
+++ b/arch/arm/boot/dts/exynos5250.dtsi
@@ -285,6 +285,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c0_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
@@ -298,6 +299,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c1_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
@@ -311,6 +313,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c2_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
@@ -324,6 +327,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c3_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
index ff496ad..762128c 100644
--- a/arch/arm/boot/dts/exynos5420.dtsi
+++ b/arch/arm/boot/dts/exynos5420.dtsi
@@ -517,6 +517,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c0_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
@@ -530,6 +531,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c1_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
@@ -543,6 +545,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c2_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
@@ -556,6 +559,7 @@
clock-names = "i2c";
pinctrl-names = "default";
pinctrl-0 = <&i2c3_bus>;
+ samsung,syscon-phandle = <&sys_reg>;
status = "disabled";
};
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 int sys_i2s_cfg;
};
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
+ * 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);
}
#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);
+
i2c->suspended = 0;
clk_prepare_enable(i2c->clk);
s3c24xx_i2c_init(i2c);
--
1.7.10.4
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