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[v2,07/19] i2c: designware_i2c: Bring in the binding file

Message ID 20200103222650.32592-6-sjg@chromium.org
State Superseded
Headers show
Series i2c: designware_ic2: Improvements to timing and general cleanup | expand

Commit Message

Simon Glass Jan. 3, 2020, 10:26 p.m. UTC 
Bring in this file from Linux v5.4.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2: None

 .../i2c/i2c-designware.txt                    | 73 +++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 doc/device-tree-bindings/i2c/i2c-designware.txt

Comments

Heiko Schocher Jan. 16, 2020, 6:47 a.m. UTC | #1 
Hello Simon,

Am 03.01.2020 um 23:26 schrieb Simon Glass:
> Bring in this file from Linux v5.4.

may you can add here the commit ID ? Or is it from tag "v5.4" ?

> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
> 
> Changes in v2: None
> 
>   .../i2c/i2c-designware.txt                    | 73 +++++++++++++++++++
>   1 file changed, 73 insertions(+)
>   create mode 100644 doc/device-tree-bindings/i2c/i2c-designware.txt

Reviewed-by: Heiko Schocher <hs at denx.de>

bye,
Heiko
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Patch

diff --git a/doc/device-tree-bindings/i2c/i2c-designware.txt b/doc/device-tree-bindings/i2c/i2c-designware.txt
new file mode 100644
index 0000000000..be766be812
--- /dev/null
+++ b/doc/device-tree-bindings/i2c/i2c-designware.txt
@@ -0,0 +1,73 @@ 
+* Synopsys DesignWare I2C
+
+Required properties :
+
+ - compatible : should be "snps,designware-i2c"
+                or "mscc,ocelot-i2c" with "snps,designware-i2c" for fallback
+ - reg : Offset and length of the register set for the device
+ - interrupts : <IRQ> where IRQ is the interrupt number.
+ - clocks : phandles for the clocks, see the description of clock-names below.
+   The phandle for the "ic_clk" clock is required. The phandle for the "pclk"
+   clock is optional. If a single clock is specified but no clock-name, it is
+   the "ic_clk" clock. If both clocks are listed, the "ic_clk" must be first.
+
+Recommended properties :
+
+ - clock-frequency : desired I2C bus clock frequency in Hz.
+
+Optional properties :
+
+ - clock-names : Contains the names of the clocks:
+    "ic_clk", for the core clock used to generate the external I2C clock.
+    "pclk", the interface clock, required for register access.
+
+ - reg : for "mscc,ocelot-i2c", a second register set to configure the SDA hold
+   time, named ICPU_CFG:TWI_DELAY in the datasheet.
+
+ - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
+   This option is only supported in hardware blocks version 1.11a or newer and
+   on Microsemi SoCs ("mscc,ocelot-i2c" compatible).
+
+ - i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds.
+   This value which is by default 300ns is used to compute the tLOW period.
+
+ - i2c-sda-falling-time-ns : should contain the SDA falling time in nanoseconds.
+   This value which is by default 300ns is used to compute the tHIGH period.
+
+Examples :
+
+	i2c at f0000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "snps,designware-i2c";
+		reg = <0xf0000 0x1000>;
+		interrupts = <11>;
+		clock-frequency = <400000>;
+	};
+
+	i2c at 1120000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "snps,designware-i2c";
+		reg = <0x1120000 0x1000>;
+		interrupt-parent = <&ictl>;
+		interrupts = <12 1>;
+		clock-frequency = <400000>;
+		i2c-sda-hold-time-ns = <300>;
+		i2c-sda-falling-time-ns = <300>;
+		i2c-scl-falling-time-ns = <300>;
+	};x
+
+	i2c at 1120000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0x2000 0x100>;
+		clock-frequency = <400000>;
+		clocks = <&i2cclk>;
+		interrupts = <0>;
+
+		eeprom at 64 {
+			compatible = "linux,slave-24c02";
+			reg = <0x40000064>;
+		};
+	};