From: Stephan Gerhold stephan@gerhold.net
[ Upstream commit 5500f823db38db073d30557af159b77fb1f2bf26 ]
The 96Boards specification expects a 1.8V power rail on the low-speed expansion connector that is able to provide at least 0.18W / 100 mA. According to the DB410c hardware user manual this is done by connecting both L15 and L16 in parallel with up to 55mA each (for 110 mA total) [1].
Unfortunately the current regulator setup in the DB410c device tree does not implement the specification correctly and only provides 5 mA:
- Only L15 is marked always-on, so L16 is never enabled. - Without specifying a load the regulator is put into LPM where it can only provide 5 mA.
Fix this by:
- Adding proper voltage constraints for L16. - Making L16 always-on. - Adding regulator-system-load for both L15 and L16. 100 mA should be available in total, so specify 50 mA for each. (The regulator hardware can only be in normal (55 mA) or low-power mode (5 mA) so this will actually result in the expected 110 mA total...)
[1]: https://www.96boards.org/documentation/consumer/dragonboard/dragonboard410c/...
Cc: Srinivas Kandagatla srinivas.kandagatla@linaro.org Fixes: 828dd5d66f0f ("arm64: dts: apq8016-sbc: make 1.8v available on LS expansion") Signed-off-by: Stephan Gerhold stephan@gerhold.net Signed-off-by: Bjorn Andersson andersson@kernel.org Link: https://lore.kernel.org/r/20230510-msm8916-regulators-v1-2-54d4960a05fc@gerh... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/qcom/apq8016-sbc.dts | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dts b/arch/arm64/boot/dts/qcom/apq8016-sbc.dts index d7d7a826b8be4..dbdb8077857ef 100644 --- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dts +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dts @@ -526,19 +526,27 @@ l14 { regulator-max-microvolt = <3300000>; };
- /** - * 1.8v required on LS expansion - * for mezzanine boards + /* + * The 96Boards specification expects a 1.8V power rail on the low-speed + * expansion connector that is able to provide at least 0.18W / 100 mA. + * L15/L16 are connected in parallel to provide 55 mA each. A minimum load + * must be specified to ensure the regulators are not put in LPM where they + * would only provide 5 mA. */ l15 { regulator-min-microvolt = <1800000>; regulator-max-microvolt = <1800000>; + regulator-system-load = <50000>; + regulator-allow-set-load; regulator-always-on; };
l16 { regulator-min-microvolt = <1800000>; - regulator-max-microvolt = <3300000>; + regulator-max-microvolt = <1800000>; + regulator-system-load = <50000>; + regulator-allow-set-load; + regulator-always-on; };
l17 {