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SubjectRe: [PATCH] ARM64: dts: meson-gxbb-wetek: fix hwmon temperature sensor output
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Date
Hi,


On 19/11/2018 05:22, Christian Hewitt wrote:
> Add &saradc and supporting vddio_ao18 nodes to fix hwmon temperature
> readings on the WeTek Hub and Play2 devices. Without these nodes the
> temp is reported as 4294967295 degrees C.
>
> Thanks to Martin Blumenstingl for assisting debug and the winning
> guess at what was missing.

It's a good workaround, but the real solution is that we should instead
add the CLKID_SAR_ADC* clock in the scpi_sensors node and update
the driver to keep these clocks enabled.

We hit the same issue as the clk_div2/3 which should be kept enabled
by the SCPI scpi_dvfs driver.

Neil

>
> Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
> ---
> arch/arm64/boot/dts/amlogic/meson-gxbb-wetek.dtsi | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-wetek.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb-wetek.dtsi
> index 70325b2..dd12e02 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-wetek.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-wetek.dtsi
> @@ -59,6 +59,13 @@
> regulator-max-microvolt = <3300000>;
> };
>
> + vddio_ao18: regulator-vddio_ao18 {
> + compatible = "regulator-fixed";
> + regulator-name = "VDDIO_AO18";
> + regulator-min-microvolt = <1800000>;
> + regulator-max-microvolt = <1800000>;
> + };
> +
> vcc_3v3: regulator-vcc_3v3 {
> compatible = "regulator-fixed";
> regulator-name = "VCC_3V3";
> @@ -173,6 +180,11 @@
> clock-names = "clkin0";
> };
>
> +&saradc {
> + status = "okay";
> + vref-supply = <&vddio_ao18>;
> +};
> +
> /* Wireless SDIO Module */
> &sd_emmc_a {
> status = "okay";
>

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