| From bae526e301c40e073379cbcf7d8239905ffcaf7f Mon Sep 17 00:00:00 2001 |
| From: Dinh Nguyen <dinguyen@kernel.org> |
| Date: Tue, 13 Dec 2016 16:52:11 -0600 |
| Subject: [PATCH 013/103] 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> |
| --- |
| arch/arm/boot/dts/socfpga_arria5_socdk.dts | 8 ++++++++ |
| arch/arm/boot/dts/socfpga_cyclone5_socdk.dts | 8 ++++++++ |
| 2 files changed, 16 insertions(+) |
| |
| --- 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"; |
| --- 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"; |