[PATCH 02/12] ARM: dts: socfpga: set desired i2c clock on Cyclone5 and Arria5 devkits
DORMANTno replies
From: Dinh Nguyen <hidden>
Date: 2017-01-05 00:21:24
Also in:
linux-arm-kernel
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 <redacted> --- arch/arm/boot/dts/socfpga_arria5_socdk.dts | 8 ++++++++ arch/arm/boot/dts/socfpga_cyclone5_socdk.dts | 8 ++++++++ 2 files changed, 16 insertions(+)
diff --git a/arch/arm/boot/dts/socfpga_arria5_socdk.dts b/arch/arm/boot/dts/socfpga_arria5_socdk.dts
index fa70c39..8672edf 100644
--- 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
--- 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";
--
2.7.4
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