On 1/2/2018 8:51 AM, Rob Herring wrote:
On Wed, Dec 27, 2017 at 09:27:23AM -0700, Karthikeyan Ramasubramanian wrote:
Add device tree binding support for I2C Controller in GENI based
QUP Wrapper.
Signed-off-by: Sagar Dharia <sdharia@xxxxxxxxxxxxxx>
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/i2c/i2c-qcom-geni.txt | 39 ++++++++++++++++++++++
1 file changed, 39 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-qcom-geni.txt
diff --git a/Documentation/devicetree/bindings/i2c/i2c-qcom-geni.txt b/Documentation/devicetree/bindings/i2c/i2c-qcom-geni.txt
new file mode 100644
index 0000000..d2fa9ce
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-qcom-geni.txt
@@ -0,0 +1,39 @@
+Qualcomm Technologies Inc. GENI based I2C Controller driver
+
+Required properties:
+ - compatible: Should be:
+ * "qcom,i2c-geni.
Only 1 version?
The Serial Engine used by I2C protocol has the same version as the QUP
h/w version. The QUP Wrapper driver exposes an interface function to get
the h/w version so that I2C controller driver can support
version-specific operations, if any.
+ - reg: Should contain QUP register address and length.
+ - interrupts: Should contain I2C interrupt.
+ - clocks: Serial engine core clock, and AHB clocks needed by the device.
Are there really clocks for a firmware based device or these are just
clocks in the parent serial engine?
The clocks are required to derive the protocol clock. The clocks are
also required by the Serial Engine to access the System Memory during
DMA mode of operation.
+ - pinctrl-names/pinctrl-0/1: The GPIOs assigned to this core. The names
+ should be "active" and "sleep" for the pin confuguration when core is active
+ or when entering sleep state.
+ - #address-cells: Should be <1> Address cells for i2c device address
+ - #size-cells: Should be <0> as i2c addresses have no size component
+ - qcom,wrapper-core: Wrapper QUP core containing this I2C controller.
Probably these devices should be child nodes of the QUP core node.
I will update it in the next patch.
+
+Optional property:
+ - qcom,clk-freq-out : Desired I2C bus clock frequency in Hz.
+ When missing default to 400000Hz.
There's a standard property for this.
I will update to use the standard property.
+
+Child nodes should conform to i2c bus binding.
+
+Example:
+
+i2c@a94000 {
+ compatible = "qcom,i2c-geni";
+ reg = <0xa94000 0x4000>;
+ interrupts = <GIC_SPI 358 0>;
+ clock-names = "se-clk", "m-ahb", "s-ahb";
+ clocks = <&clock_gcc GCC_QUPV3_WRAP0_S5_CLK>,
+ <&clock_gcc GCC_QUPV3_WRAP_0_M_AHB_CLK>,
+ <&clock_gcc GCC_QUPV3_WRAP_0_S_AHB_CLK>;
+ pinctrl-names = "default", "sleep";
+ pinctrl-0 = <&qup_1_i2c_5_active>;
+ pinctrl-1 = <&qup_1_i2c_5_sleep>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ qcom,wrapper-core = <&qup_0>;
+ qcom,clk-freq-out = <400000>;
+};
--
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Regards,
Karthik.
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