diff options
| author | Karthikeyan Ramasubramanian <kramasub@google.com> | 2021-06-02 16:14:39 -0600 |
|---|---|---|
| committer | Werner Zeh <werner.zeh@siemens.com> | 2021-06-07 05:18:49 +0000 |
| commit | fec4db954e44a3fd23fedd2f51189c13c985eee9 (patch) | |
| tree | c548c574978d26dbaeb02db1fbfab49a91458ce2 /src/mainboard | |
| parent | fcb9716db51ed239fcf2b870b6b5e439e2ffe5c6 (diff) | |
soc/amd/cezanne: Configure I2C Pad RX Select through devicetree
Some of the I2C buses are required to operate at different voltage level
compared to other I2C buses eg. I2C bus to Google Security Chip (GSC)
should be at 1.8V level. By default, all the I2C buses are initialized
to operate at 3.3 V. Add support to configure I2C pad RX select through
devicetree and update the concerned devicetree.
BUG=b:188538373
TEST=Build and boot to OS in Guybrush. Ensure that the communication
with GSC is fine. Build Majolica mainboard.
Change-Id: I595a64736fdac0274abffb68c5e521302275b845
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55149
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/amd/majolica/devicetree.cb | 6 | ||||
| -rw-r--r-- | src/mainboard/google/guybrush/variants/baseboard/devicetree.cb | 5 |
2 files changed, 11 insertions, 0 deletions
diff --git a/src/mainboard/amd/majolica/devicetree.cb b/src/mainboard/amd/majolica/devicetree.cb index dc73b844d0..5e9d971b9e 100644 --- a/src/mainboard/amd/majolica/devicetree.cb +++ b/src/mainboard/amd/majolica/devicetree.cb @@ -13,6 +13,12 @@ chip soc/amd/cezanne .flash_ch_en = 0, }" + # I2C Pad Control RX Select Configuration + register "i2c_pad_ctrl_rx_sel[0]" = "I2C_PAD_CTRL_RX_SEL_3_3V" + register "i2c_pad_ctrl_rx_sel[1]" = "I2C_PAD_CTRL_RX_SEL_3_3V" + register "i2c_pad_ctrl_rx_sel[2]" = "I2C_PAD_CTRL_RX_SEL_3_3V" + register "i2c_pad_ctrl_rx_sel[3]" = "I2C_PAD_CTRL_RX_SEL_3_3V" + register "s0ix_enable" = "true" register "pspp_policy" = "DXIO_PSPP_BALANCED" diff --git a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb index c778914b6a..2c0c5d97c4 100644 --- a/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb +++ b/src/mainboard/google/guybrush/variants/baseboard/devicetree.cb @@ -51,6 +51,11 @@ chip soc/amd/cezanne register "i2c_scl_reset" = "GPIO_I2C0_SCL | GPIO_I2C1_SCL | GPIO_I2C2_SCL | GPIO_I2C3_SCL" + # I2C Pad Control RX Select Configuration + register "i2c_pad_ctrl_rx_sel[0]" = "I2C_PAD_CTRL_RX_SEL_3_3V" # Trackpad + register "i2c_pad_ctrl_rx_sel[1]" = "I2C_PAD_CTRL_RX_SEL_3_3V" # Touchscreen + register "i2c_pad_ctrl_rx_sel[2]" = "I2C_PAD_CTRL_RX_SEL_3_3V" # Audio/SAR + register "i2c_pad_ctrl_rx_sel[3]" = "I2C_PAD_CTRL_RX_SEL_1_8V" # GSC register "pspp_policy" = "DXIO_PSPP_POWERSAVE" |