diff options
| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-02-10 04:36:36 +0300 |
|---|---|---|
| committer | Thierry Reding <treding@nvidia.com> | 2018-03-08 18:08:20 +0300 |
| commit | 1c3389e6cb99d36196df322dd40aa73cd06f983b (patch) | |
| tree | 1574348875f3e21899baa011efeb17fce79c423e /arch/arm | |
| parent | 1014e895f808f144d91e06815175648b4ae14c0a (diff) | |
| download | linux-1c3389e6cb99d36196df322dd40aa73cd06f983b.tar.xz | |
ARM: tegra: Fix I2C bus frequencies on Apalis/Colibri
Use a faster speed of 400 kbit/s for regular I2C busses.
Use a slower speed of 10 kbit/s for DDC/EDID to improve reliability.
Use a slower speed of 100 kbit/s for power I2C to be within specs of
the LM95245 temperature sensor.
While at it further annotate I2C pin usage.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/boot/dts/tegra124-apalis-eval.dts | 5 | ||||
| -rw-r--r-- | arch/arm/boot/dts/tegra124-apalis.dtsi | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/tegra20-colibri-512.dtsi | 16 | ||||
| -rw-r--r-- | arch/arm/boot/dts/tegra30-apalis-eval.dts | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/tegra30-apalis.dtsi | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/tegra30-colibri-eval-v3.dts | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/tegra30-colibri.dtsi | 2 |
7 files changed, 18 insertions, 13 deletions
diff --git a/arch/arm/boot/dts/tegra124-apalis-eval.dts b/arch/arm/boot/dts/tegra124-apalis-eval.dts index ecffcd115fa7..66b6c45ee865 100644 --- a/arch/arm/boot/dts/tegra124-apalis-eval.dts +++ b/arch/arm/boot/dts/tegra124-apalis-eval.dts @@ -105,7 +105,7 @@ */ i2c@7000c000 { status = "okay"; - clock-frequency = <100000>; + clock-frequency = <400000>; pcie-switch@58 { compatible = "plx,pex8605"; @@ -124,7 +124,6 @@ */ hdmi_ddc: i2c@7000c400 { status = "okay"; - clock-frequency = <100000>; }; /* @@ -133,7 +132,7 @@ */ i2c@7000c500 { status = "okay"; - clock-frequency = <100000>; + clock-frequency = <400000>; }; /* I2C4 (DDC): unused */ diff --git a/arch/arm/boot/dts/tegra124-apalis.dtsi b/arch/arm/boot/dts/tegra124-apalis.dtsi index 5d9b18ef5af6..7aef8928e115 100644 --- a/arch/arm/boot/dts/tegra124-apalis.dtsi +++ b/arch/arm/boot/dts/tegra124-apalis.dtsi @@ -1579,7 +1579,7 @@ }; hdmi_ddc: i2c@7000c400 { - clock-frequency = <100000>; + clock-frequency = <10000>; }; /* PWR_I2C: power I2C to audio codec, PMIC and temperature sensor */ diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi b/arch/arm/boot/dts/tegra20-colibri-512.dtsi index 813ae34edd6a..5c202b3e3bb1 100644 --- a/arch/arm/boot/dts/tegra20-colibri-512.dtsi +++ b/arch/arm/boot/dts/tegra20-colibri-512.dtsi @@ -213,21 +213,27 @@ GPIO_ACTIVE_HIGH>; }; + /* + * GEN1_I2C: I2C_SDA/SCL on SODIMM pin 194/196 (e.g. RTC on carrier + * board) + */ i2c@7000c000 { clock-frequency = <400000>; }; + /* DDC_SCL/SDA on X3 pin 15/16 (e.g. display EDID) */ i2c_ddc: i2c@7000c400 { - clock-frequency = <100000>; + clock-frequency = <10000>; }; - i2c@7000c500 { - clock-frequency = <400000>; - }; + /* GEN2_I2C: unused */ + /* CAM/GEN3_I2C: used as EXT_IO1/2 GPIOs on SODIMM pin 133/127 */ + + /* PWR_I2C: power I2C to PMIC and temperature sensor (On-module) */ i2c@7000d000 { status = "okay"; - clock-frequency = <400000>; + clock-frequency = <100000>; pmic: tps6586x@34 { compatible = "ti,tps6586x"; diff --git a/arch/arm/boot/dts/tegra30-apalis-eval.dts b/arch/arm/boot/dts/tegra30-apalis-eval.dts index 07b945b0391a..fdca527a2248 100644 --- a/arch/arm/boot/dts/tegra30-apalis-eval.dts +++ b/arch/arm/boot/dts/tegra30-apalis-eval.dts @@ -79,7 +79,7 @@ */ i2c@7000c000 { status = "okay"; - clock-frequency = <100000>; + clock-frequency = <400000>; pcie-switch@58 { compatible = "plx,pex8605"; diff --git a/arch/arm/boot/dts/tegra30-apalis.dtsi b/arch/arm/boot/dts/tegra30-apalis.dtsi index bfb7913c0657..676a4c4b1512 100644 --- a/arch/arm/boot/dts/tegra30-apalis.dtsi +++ b/arch/arm/boot/dts/tegra30-apalis.dtsi @@ -437,7 +437,7 @@ }; hdmiddc: i2c@7000c700 { - clock-frequency = <100000>; + clock-frequency = <10000>; }; /* diff --git a/arch/arm/boot/dts/tegra30-colibri-eval-v3.dts b/arch/arm/boot/dts/tegra30-colibri-eval-v3.dts index b307feb7c330..8c62833197e5 100644 --- a/arch/arm/boot/dts/tegra30-colibri-eval-v3.dts +++ b/arch/arm/boot/dts/tegra30-colibri-eval-v3.dts @@ -56,7 +56,7 @@ */ i2c@7000c000 { status = "okay"; - clock-frequency = <100000>; + clock-frequency = <400000>; /* M41T0M6 real time clock on carrier board */ rtc@68 { diff --git a/arch/arm/boot/dts/tegra30-colibri.dtsi b/arch/arm/boot/dts/tegra30-colibri.dtsi index 139bfa028b04..1f77273521bf 100644 --- a/arch/arm/boot/dts/tegra30-colibri.dtsi +++ b/arch/arm/boot/dts/tegra30-colibri.dtsi @@ -215,7 +215,7 @@ }; hdmiddc: i2c@7000c700 { - clock-frequency = <100000>; + clock-frequency = <10000>; }; /* |