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[RESEND,v9,2/2] dt-bindings: i2c: I2C binding for Mellanox BlueField SoC

Message ID 6c4005b8c0ccba4dc6391d187de4f816562d352b.1600277745.git.kblaiech@mellanox.com
State New
Headers show
Series None | expand

Commit Message

Khalil Blaiech Sept. 16, 2020, 6:28 p.m. UTC 
From: Khalil Blaiech <kblaiech@mellanox.com>

Add device tree bindings documentation for Mellanox BlueField
I2C SMBus controller.

Signed-off-by: Khalil Blaiech <kblaiech@mellanox.com>
---
v5->v6:
	- Adding description of an extra resource to be
	consistent with new BlueField-2 SoCs.
	- Adding an additional example of device instance.
v3->v4:
	- Re-ordering of the property descriptions.
	- Removing useless register addresses from the
	resource description.
	- Definition of default clock-frequency value.
	- Fixing format issues; removing spaces.
	- Removing "aliases" from Example section.
	- Renaming device instance node in Example section.
v2->v3:
	- Removing shared resources from the controller
	instance.
	- Updating the 'compatible' property and support the
	second generation of the Mellanox BlueField SoC.
	- Fixing file format; replacing spaces with tabs.
v1->v2:
	- Enumeration of the device resources.
	- Updating the 'compatible' property to make it less
	generic.
	- Removing the 'bus' index property and replace it with
	standard approach to read the bus identifier.
	- Getting rid of the 'profile' property.
	- Using 'clock-frequency' property instead of 'bus-freq'.
	- Convertion of the clock frequency from KHz to Hz.
	- Removing useless examples.
---
 .../devicetree/bindings/i2c/mellanox,i2c-mlxbf.txt | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.txt
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Patch

diff --git a/Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.txt b/Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.txt
new file mode 100644
index 0000000..566ea86
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/mellanox,i2c-mlxbf.txt
@@ -0,0 +1,42 @@ 
+Device tree configuration for the Mellanox I2C SMBus on BlueField SoCs
+
+Required Properties:
+
+- compatible : should be "mellanox,i2c-mlxbf1" or "mellanox,i2c-mlxbf2".
+
+- reg : address offset and length of the device registers. The
+	registers consist of the following set of resources:
+		1) Smbus block registers.
+		2) Cause master registers.
+		3) Cause slave registers.
+		4) Cause coalesce registers (if compatible isn't set
+		   to "mellanox,i2c-mlxbf1").
+
+- interrupts : interrupt number.
+
+Optional Properties:
+
+- clock-frequency : bus frequency used to configure timing registers;
+			allowed values are 100000, 400000 and 1000000;
+			those are expressed in Hz. Default is 100000.
+
+Example:
+
+i2c@2804000 {
+	compatible = "mellanox,i2c-mlxbf1";
+	reg =	<0x02804000 0x800>,
+		<0x02801200 0x020>,
+		<0x02801260 0x020>;
+	interrupts = <57>;
+	clock-frequency = <100000>;
+};
+
+i2c@2808800 {
+	compatible = "mellanox,i2c-mlxbf2";
+	reg =	<0x02808800 0x600>,
+	        <0x02808e00 0x020>,
+		<0x02808e20 0x020>,
+		<0x02808e40 0x010>;
+	interrupts = <57>;
+	clock-frequency = <400000>;
+};