Hi Rob,
On 04/13/2017 04:22 PM, Rob Herring wrote:
On Tue, Apr 11, 2017 at 11:02:26AM -0500, thor.thayer@xxxxxxxxxxxxxxx wrote:
From: Thor Thayer <thor.thayer@xxxxxxxxxxxxxxx>
Add the documentation to support the Altera I2C Controller.
"dt-bindings: i2c: ..." for the subject.
Got it. Thanks.
Signed-off-by: Thor Thayer <thor.thayer@xxxxxxxxxxxxxxx>
---
.../devicetree/bindings/i2c/i2c-altera.txt | 37 ++++++++++++++++++++++
1 file changed, 37 insertions(+)
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-altera.txt
diff --git a/Documentation/devicetree/bindings/i2c/i2c-altera.txt b/Documentation/devicetree/bindings/i2c/i2c-altera.txt
new file mode 100644
index 0000000..a67241c
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-altera.txt
@@ -0,0 +1,37 @@
+* Altera I2C Controller
This is the only one? For synthesizable logic or a hard block in
socfpga?
This is synthesizable logic in an FPGA.
+
+Required properties :
+ - compatible : should be "altr,sip-i2c"
Seems kind of generic.
I'm using sip for soft IP - right now we only offer 1 flavor.
+ - reg : Offset and length of the register set for the device
+ - interrupts : <IRQ> where IRQ is the interrupt number.
+ - clocks : phandles to input clocks.
Need to specify how many clocks.
OK. There is only 1 so I'll change to singular. phandle to input clock.
+ - #address-cells = <1>;
+ - #size-cells = <0>;
+
+Recommended properties :
+ - clock-frequency : desired I2C bus clock frequency in Hz.
+
+Optional properties :
+ - altr,fifo-size : Size of the RX and TX FIFOs.
in bytes?
Just "fifo-size" is already fairly common, so drop the vendor prefix.
Yes, it is in bytes. I'll make the change.
Thanks for reviewing!
+ - Child nodes conforming to i2c bus binding
+
+Example :
+
+ i2c@100080000 {
+ compatible = "altr,sip-i2c";
+ reg = <0x00000001 0x00080000 0x00000040>;
+ interrupt-parent = <&intc>;
+ interrupts = <0 43 4>;
+ clocks = <&clk_0>;
+ clock-frequency = <100000>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ altr,fifo-size = <4>;
+
+ eeprom@51 {
+ compatible = "atmel,24c32";
+ reg = <0x51>;
+ pagesize = <32>;
+ };
+ };
+
--
1.9.1
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