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

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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>
This commit is contained in:
Dinh Nguyen 2016-12-13 16:52:11 -06:00
parent 55b0f44cc2
commit 4d3e72b119
2 changed files with 16 additions and 0 deletions
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8
arch/arm/boot/dts/socfpga_arria5_socdk.dts
View File

@ -98,6 +98,14 @@ &gpio2 {
&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";

8
arch/arm/boot/dts/socfpga_cyclone5_socdk.dts
View File

@ -98,6 +98,14 @@ &gpio2 {
&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";