i2c: designware_i2c: Bring in the binding file

Bring in this file from Linux v5.4.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>

diff --git a/doc/device-tree-bindings/i2c/i2c-designware.txt b/doc/device-tree-bindings/i2c/i2c-designware.txt
new file mode 100644 (file)
index 0000000..be766be
--- /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@f0000 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "snps,designware-i2c";
+               reg = <0xf0000 0x1000>;
+               interrupts = <11>;
+               clock-frequency = <400000>;
+       };
+
+       i2c@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@1120000 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               reg = <0x2000 0x100>;
+               clock-frequency = <400000>;
+               clocks = <&i2cclk>;
+               interrupts = <0>;
+
+               eeprom@64 {
+                       compatible = "linux,slave-24c02";
+                       reg = <0x40000064>;
+               };
+       };