[PATCH 1/2] arm64: dts: imx8mm-beacon-som: Fix RTC aliases

[PATCH 1/2] arm64: dts: imx8mm-beacon-som: Fix RTC aliases

[Adam Ford]

On the i.MX8MM Beacon SOM, there is an RTC chip which is fed power
from the baseboard during power off.  The SNVS RTC integrated into
the SoC is not fed power.  Depending on the order the modules are
loaded, this can be a problem if the external RTC isn't rtc0.

Make the alias for rtc0 point to the external RTC all the time and
rtc1 point to the SVNS in order to correctly hold date/time over
a power-cycle.

Fixes: 593816fa2f35 ("arm64: dts: imx: Add Beacon i.MX8m-Mini development kit")

Signed-off-by: Adam Ford <aford173@gmail.com>

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
index 5565775270f9..9bdefbba9e90 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
@@ -4,6 +4,11 @@
  */
 
 / {
+	aliases {
+		rtc0 = &rtc;
+		rtc1 = &snvs_rtc;
+	};
+
 	usdhc1_pwrseq: usdhc1_pwrseq {
 		compatible = "mmc-pwrseq-simple";
 		pinctrl-names = "default";
@@ -219,7 +224,7 @@ eeprom@50 {
 		reg = <0x50>;
 	};
 
-	rtc@51 {
+	rtc: rtc@51 {
 		compatible = "nxp,pcf85263";
 		reg = <0x51>;
 	};
-- 
2.25.1


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[PATCH 2/2] arm64: dts: imx8mm-beacon-som: Fix PMIC clock error

[Adam Ford]

The PMIC throws an errors because the clock isn't assigned to it.
Fix this by assigning the clocks info.

Fixes:  acb01032e11a ("arm64: defconfig: Enable clock driver for ROHM BD718x7 PMIC")

Signed-off-by: Adam Ford <aford173@gmail.com>

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
index 9bdefbba9e90..d897913537ca 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-som.dtsi
@@ -111,6 +111,10 @@ pmic@4b {
 		interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
 		rohm,reset-snvs-powered;
 
+		#clock-cells = <0>;
+		clocks = <&osc_32k 0>;
+		clock-output-names = "clk-32k-out";
+
 		regulators {
 			buck1_reg: BUCK1 {
 				regulator-name = "buck1";
-- 
2.25.1


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Re: [PATCH 2/2] arm64: dts: imx8mm-beacon-som: Fix PMIC clock error

[Krzysztof Kozlowski]

On Wed, Nov 25, 2020 at 03:03:39PM -0600, Adam Ford wrote:
> The PMIC throws an errors because the clock isn't assigned to it.
> Fix this by assigning the clocks info.
> 
> Fixes:  acb01032e11a ("arm64: defconfig: Enable clock driver for ROHM BD718x7 PMIC")

Hi,

This is not the correct Fixes tag. The defconfig change did not
introduce any bug in DTS. The error message was there before, regardless
of defconfigs. Defconfigs are merely a development or distro aid, not a
definition of working state.

If it really was a bug, then the commit adding DTS is to blame.

Second, I am not sure if there is a bug here to fix - having incomplete
DTS is a bug? Missing device nodes in DTS is a bug?

Also, pay attention to proper white spaces. There is only single
whitespace after ':' and no blank line after entire Fixes tag.

Best regards,
Krzysztof

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Re: [PATCH 1/2] arm64: dts: imx8mm-beacon-som: Fix RTC aliases

[Krzysztof Kozlowski]

On Wed, Nov 25, 2020 at 03:03:38PM -0600, Adam Ford wrote:
> On the i.MX8MM Beacon SOM, there is an RTC chip which is fed power
> from the baseboard during power off.  The SNVS RTC integrated into
> the SoC is not fed power.  Depending on the order the modules are
> loaded, this can be a problem if the external RTC isn't rtc0.
> 
> Make the alias for rtc0 point to the external RTC all the time and
> rtc1 point to the SVNS in order to correctly hold date/time over
> a power-cycle.
> 
> Fixes: 593816fa2f35 ("arm64: dts: imx: Add Beacon i.MX8m-Mini development kit")

There is no bug here so this is not a fix. Please remove the "fix" from
the title and "Fixes" tag.

This is purely for making user-space RTC lookup easier, nothing to fix.

Best regards,
Krzysztof

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