ARM: dts: socfpga: set desired i2c clock on Cyclone5 and Arria5 devkits

The I2C LCD display on the Cyclone5 and Arria5 devkits is only capable of
the standard 100 kHz clock. Set the "clock-frequency" of the I2C node
to be 100000.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

diff --git a/arch/arm/boot/dts/socfpga_arria5_socdk.dts b/arch/arm/boot/dts/socfpga_arria5_socdk.dts
index fa70c39..8672edf 100644 (file)
--- a/arch/arm/boot/dts/socfpga_arria5_socdk.dts
+++ b/arch/arm/boot/dts/socfpga_arria5_socdk.dts
@@ -98,6 +98,14 @@
 
 &i2c0 {
        status = "okay";
+       clock-frequency = <100000>;
+
+       /*
+        * adjust the falling times to decrease the i2c frequency to 50Khz
+        * because the LCD module does not work at the standard 100Khz
+        */
+       i2c-sda-falling-time-ns = <5000>;
+       i2c-scl-falling-time-ns = <5000>;
 
        eeprom@51 {
                compatible = "atmel,24c32";

diff --git a/arch/arm/boot/dts/socfpga_cyclone5_socdk.dts b/arch/arm/boot/dts/socfpga_cyclone5_socdk.dts
index 6d3188b..24650ba 100644 (file)
--- a/arch/arm/boot/dts/socfpga_cyclone5_socdk.dts
+++ b/arch/arm/boot/dts/socfpga_cyclone5_socdk.dts
@@ -98,6 +98,14 @@
 
 &i2c0 {
        status = "okay";
+       clock-frequency = <100000>;
+
+       /*
+        * adjust the falling times to decrease the i2c frequency to 50Khz
+        * because the LCD module does not work at the standard 100Khz
+        */
+       i2c-sda-falling-time-ns = <5000>;
+       i2c-scl-falling-time-ns = <5000>;
 
        eeprom@51 {
                compatible = "atmel,24c32";