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authorWerner Zeh <werner.zeh@siemens.com>2022-11-07 15:21:40 +0100
committerFelix Held <felix-coreboot@felixheld.de>2022-11-09 14:20:09 +0000
commitcc7634fd697432ea983ebd1bcf08202a0e8099a8 (patch)
tree8169dca44f56a5df12999629a7b51aa911b7b52e /src/mainboard/siemens/mc_ehl/variants
parenteda13db4e93bda57d73a5b71229588238b5e1e1b (diff)
mb/siemens/mc_ehl2: Provide I2C timing parameter for SSDT
Provide timing parameter for SSDT generation to achieve the requested 100 kHz speed with a high accuracy. Test: Measure I2C bus clock, high and low times during I2C access from Linux and confirm they match the specification. Change-Id: Ifb6019421b612133b8f25c076519bc0e7200dad8 Signed-off-by: Werner Zeh <werner.zeh@siemens.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/69307 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com> Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Diffstat (limited to 'src/mainboard/siemens/mc_ehl/variants')
-rw-r--r--src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
index d5d12777ec..3b54f24896 100644
--- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
+++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/devicetree.cb
@@ -111,9 +111,21 @@ chip soc/intel/elkhartlake
register "common_soc_config" = "{
.i2c[1] = {
.speed = I2C_SPEED_STANDARD,
+ .speed_config[0] = {
+ .speed = I2C_SPEED_STANDARD,
+ .scl_hcnt = 0x1e1,
+ .scl_lcnt = 0x1f4,
+ .sda_hold = 0x64
+ },
},
.i2c[2] = {
.speed = I2C_SPEED_STANDARD,
+ .speed_config[0] = {
+ .speed = I2C_SPEED_STANDARD,
+ .scl_hcnt = 0x1df,
+ .scl_lcnt = 0x1f4,
+ .sda_hold = 0x64
+ },
},
}"