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authorDave Gerlach <d-gerlach@ti.com>2021-07-16 09:07:30 -0700
committerTony Lindgren <tony@atomide.com>2021-07-27 11:11:38 +0300
commit20a6b3fd8e2e2c063b25fbf2ee74d86b898e5087 (patch)
tree7cd2495a2a670c9cda87115fd49bcf77ca11ef99 /arch/arm/boot/dts/am43x-epos-evm.dts
parenta6d90e9f22328f07343e49e08a4ca483ae8e8abb (diff)
ARM: dts: am43x-epos-evm: Reduce i2c0 bus speed for tps65218
Based on the latest timing specifications for the TPS65218 from the data sheet, http://www.ti.com/lit/ds/symlink/tps65218.pdf, document SLDS206 from November 2014, we must change the i2c bus speed to better fit within the minimum high SCL time required for proper i2c transfer. When running at 400khz, measurements show that SCL spends 0.8125 uS/1.666 uS high/low which violates the requirement for minimum high period of SCL provided in datasheet Table 7.6 which is 1 uS. Switching to 100khz gives us 5 uS/5 uS high/low which both fall above the minimum given values for 100 khz, 4.0 uS/4.7 uS high/low. Without this patch occasionally a voltage set operation from the kernel will appear to have worked but the actual voltage reflected on the PMIC will not have updated, causing problems especially with cpufreq that may update to a higher OPP without actually raising the voltage on DCDC2, leading to a hang. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/boot/dts/am43x-epos-evm.dts')
-rw-r--r--arch/arm/boot/dts/am43x-epos-evm.dts2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/am43x-epos-evm.dts b/arch/arm/boot/dts/am43x-epos-evm.dts
index aae0af10a5b1..2aa75abf85a9 100644
--- a/arch/arm/boot/dts/am43x-epos-evm.dts
+++ b/arch/arm/boot/dts/am43x-epos-evm.dts
@@ -582,7 +582,7 @@
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&i2c0_pins>;
- clock-frequency = <400000>;
+ clock-frequency = <100000>;
tps65218: tps65218@24 {
reg = <0x24>;