diff mbox

[v3,1/2] i2c: qup: Add device tree bindings information

Message ID 1392943090-30556-2-git-send-email-bjorn.andersson@sonymobile.com (mailing list archive)
State New, archived
Headers show

Commit Message

Bjorn Andersson Feb. 21, 2014, 12:38 a.m. UTC
From: "Ivan T. Ivanov" <iivanov@mm-sol.com>

The Qualcomm Universal Peripherial (QUP) wraps I2C mini-core and
provide input and output FIFO's for it. I2C controller can operate
as master with supported bus speeds of 100Kbps and 400Kbps.

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
[bjorn: reformulated part of binding description
        added version to compatible
        cleaned up example]
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
---
 .../devicetree/bindings/i2c/qcom,i2c-qup.txt       |   44 ++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt

Comments

Mark Rutland Feb. 21, 2014, 11:01 a.m. UTC | #1
On Fri, Feb 21, 2014 at 12:38:09AM +0000, Bjorn Andersson wrote:
> From: "Ivan T. Ivanov" <iivanov@mm-sol.com>
> 
> The Qualcomm Universal Peripherial (QUP) wraps I2C mini-core and
> provide input and output FIFO's for it. I2C controller can operate
> as master with supported bus speeds of 100Kbps and 400Kbps.
> 
> Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
> [bjorn: reformulated part of binding description
>         added version to compatible
>         cleaned up example]
> Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
> ---
>  .../devicetree/bindings/i2c/qcom,i2c-qup.txt       |   44 ++++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
> 
> diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
> new file mode 100644
> index 0000000..38d505f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
> @@ -0,0 +1,44 @@
> +Qualcomm Universal Peripheral (QUP) I2C controller
> +
> +Required properties:
> + - compatible: Should be
> +		"qcom,i2c-qup-v1.1.1" for 8660, 8960 and 8064.
> +		"qcom,i2c-qup-v2.1.1" for 8974 v1.
> +		"qcom,i2c-qup-v2.2.1" for 8974 v2 and later.
> + - reg: Should contain QUP register address and length.
> + - interrupts: Should contain I2C interrupt.
> +
> + - clocks: Should contain the core clock and the AHB clock.
> + - clock-names: Should be "core" for the core clock and "iface" for the
> +                AHB clock.

Could you please describe clocks in terms of clock-names? It makes the
relationship clearer, and avoids redundancy (which makes extending the
bindnig easier):

- clocks: A list of phandles + clock-specifiers, one for each entry in
  clock-names.
- clock-names: should contain:
  * "core" for the core clock
  * "iface" for the AHB clock

Cheers,
Mark.

> +
> + - #address-cells: Should be <1> Address cells for i2c device address
> + - #size-cells: Should be <0> as i2c addresses have no size component
> +
> +Optional properties:
> + - clock-frequency: Should specify the desired i2c bus clock frequency in Hz,
> +                    defaults to 100kHz if omitted.
> +
> +Child nodes should conform to i2c bus binding.
> +
> +Example:
> +
> + i2c@f9924000 {
> + 	compatible = "qcom,i2c-qup-v2.2.1";
> + 	reg = <0xf9924000 0x1000>;
> + 	interrupts = <0 96 0>;
> +
> + 	clocks = <&gcc GCC_BLSP1_QUP2_I2C_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>;
> + 	clock-names = "core", "iface";
> +
> + 	clock-frequency = <355000>;
> +
> + 	#address-cells = <1>;
> + 	#size-cells = <0>;
> +
> + 	dummy@60 {
> + 		compatible = "dummy";
> + 		reg = <0x60>;
> + 	};
> + };
> +
> -- 
> 1.7.9.5
> 
>
diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
new file mode 100644
index 0000000..38d505f
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
@@ -0,0 +1,44 @@ 
+Qualcomm Universal Peripheral (QUP) I2C controller
+
+Required properties:
+ - compatible: Should be
+		"qcom,i2c-qup-v1.1.1" for 8660, 8960 and 8064.
+		"qcom,i2c-qup-v2.1.1" for 8974 v1.
+		"qcom,i2c-qup-v2.2.1" for 8974 v2 and later.
+ - reg: Should contain QUP register address and length.
+ - interrupts: Should contain I2C interrupt.
+
+ - clocks: Should contain the core clock and the AHB clock.
+ - clock-names: Should be "core" for the core clock and "iface" for the
+                AHB clock.
+
+ - #address-cells: Should be <1> Address cells for i2c device address
+ - #size-cells: Should be <0> as i2c addresses have no size component
+
+Optional properties:
+ - clock-frequency: Should specify the desired i2c bus clock frequency in Hz,
+                    defaults to 100kHz if omitted.
+
+Child nodes should conform to i2c bus binding.
+
+Example:
+
+ i2c@f9924000 {
+ 	compatible = "qcom,i2c-qup-v2.2.1";
+ 	reg = <0xf9924000 0x1000>;
+ 	interrupts = <0 96 0>;
+
+ 	clocks = <&gcc GCC_BLSP1_QUP2_I2C_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>;
+ 	clock-names = "core", "iface";
+
+ 	clock-frequency = <355000>;
+
+ 	#address-cells = <1>;
+ 	#size-cells = <0>;
+
+ 	dummy@60 {
+ 		compatible = "dummy";
+ 		reg = <0x60>;
+ 	};
+ };
+