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linux-next/Documentation/devicetree/bindings/i2c/i2c-s3c2410.txt
Pankaj Dubey 1888eb75e6 ARM: dts: add sysreg phandle to i2c device nodes for exynos
This patch adds syscon based phandle to i2c device nodes of exynos5250
and exynos5420. These phandles will be used to save restore i2c sysreg
configuration register during s2r from i2c driver.

CC: Rob Herring <robh+dt@kernel.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Russell King <linux@arm.linux.org.uk>
CC: devicetree@vger.kernel.org
CC: linux-doc@vger.kernel.org
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2014-11-27 03:24:45 +09:00

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* Samsung's I2C controller
The Samsung's I2C controller is used to interface with I2C devices.
Required properties:
- compatible: value should be either of the following.
(a) "samsung, s3c2410-i2c", for i2c compatible with s3c2410 i2c.
(b) "samsung, s3c2440-i2c", for i2c compatible with s3c2440 i2c.
(c) "samsung, s3c2440-hdmiphy-i2c", for s3c2440-like i2c used
inside HDMIPHY block found on several samsung SoCs
(d) "samsung, exynos5440-i2c", for s3c2440-like i2c used
on EXYNOS5440 which does not need GPIO configuration.
(e) "samsung, exynos5-sata-phy-i2c", for s3c2440-like i2c used as
a host to SATA PHY controller on an internal bus.
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: interrupt number to the cpu.
- samsung,i2c-sda-delay: Delay (in ns) applied to data line (SDA) edges.
Required for all cases except "samsung,s3c2440-hdmiphy-i2c":
- Samsung GPIO variant (deprecated):
- gpios: The order of the gpios should be the following: <SDA, SCL>.
The gpio specifier depends on the gpio controller. Required in all
cases except for "samsung,s3c2440-hdmiphy-i2c" whose input/output
lines are permanently wired to the respective clienta
- Pinctrl variant (preferred, if available):
- pinctrl-0: Pin control group to be used for this controller.
- pinctrl-names: Should contain only one value - "default".
Optional properties:
- samsung,i2c-slave-addr: Slave address in multi-master environment. If not
specified, default value is 0.
- samsung,i2c-max-bus-freq: Desired frequency in Hz of the bus. If not
specified, the default value in Hz is 100000.
- samsung,sysreg-phandle - handle to syscon used to control the system registers
Example:
i2c@13870000 {
compatible = "samsung,s3c2440-i2c";
reg = <0x13870000 0x100>;
interrupts = <345>;
samsung,i2c-sda-delay = <100>;
samsung,i2c-max-bus-freq = <100000>;
/* Samsung GPIO variant begins here */
gpios = <&gpd1 2 0 /* SDA */
&gpd1 3 0 /* SCL */>;
/* Samsung GPIO variant ends here */
/* Pinctrl variant begins here */
pinctrl-0 = <&i2c3_bus>;
pinctrl-names = "default";
/* Pinctrl variant ends here */
#address-cells = <1>;
#size-cells = <0>;
wm8994@1a {
compatible = "wlf,wm8994";
reg = <0x1a>;
};
};