diff mbox series

[04/33] ARM: dts: exynos: Correct S3C RTC bindings and enable it in Origen

Message ID 20200830135200.24304-4-krzk@kernel.org (mailing list archive)
State New, archived
Headers show
Series [01/33] ARM: dts: exynos: Silence i2c-gpio dtschema warning in Galaxy I9100 | expand

Commit Message

Krzysztof Kozlowski Aug. 30, 2020, 1:51 p.m. UTC
The S3C RTC requires 32768 Hz clock as input which is provided by PMIC
(Maxim MAX8997).  However there is no clock provided for the PMIC and
the driver registers the clock as regulator.  This is an old driver
which will not be updated so add a workaround:
1. Enable the "clock" regulator in PMIC,
2. Add a fixed-clock to fill missing clock phandle reference in S3C RTC.

This allows to enable the S3C RTC and fixes dtbs_check warnings:

  arch/arm/boot/dts/exynos4210-origen.dt.yaml: rtc@10070000: clocks: [[5, 346]] is too short
  arch/arm/boot/dts/exynos4210-origen.dt.yaml: rtc@10070000: clock-names: ['rtc'] is too short

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
 arch/arm/boot/dts/exynos4210-origen.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Comments

Marek Szyprowski Aug. 31, 2020, 9:49 a.m. UTC | #1
On 30.08.2020 15:51, Krzysztof Kozlowski wrote:
> The S3C RTC requires 32768 Hz clock as input which is provided by PMIC
> (Maxim MAX8997).  However there is no clock provided for the PMIC and
> the driver registers the clock as regulator.  This is an old driver
> which will not be updated so add a workaround:
> 1. Enable the "clock" regulator in PMIC,
> 2. Add a fixed-clock to fill missing clock phandle reference in S3C RTC.
>
> This allows to enable the S3C RTC and fixes dtbs_check warnings:
>
>    arch/arm/boot/dts/exynos4210-origen.dt.yaml: rtc@10070000: clocks: [[5, 346]] is too short
>    arch/arm/boot/dts/exynos4210-origen.dt.yaml: rtc@10070000: clock-names: ['rtc'] is too short
>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

Confirmed, this workaround enables s3c-rtc driver operation on this board.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
>   arch/arm/boot/dts/exynos4210-origen.dts | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos4210-origen.dts b/arch/arm/boot/dts/exynos4210-origen.dts
> index 890525b10d22..747221bbb856 100644
> --- a/arch/arm/boot/dts/exynos4210-origen.dts
> +++ b/arch/arm/boot/dts/exynos4210-origen.dts
> @@ -100,6 +100,13 @@
>   			compatible = "samsung,clock-xusbxti";
>   			clock-frequency = <24000000>;
>   		};
> +
> +		pmic_ap_clk: pmic-ap-clk {
> +			/* Workaround for missing clock on max8997 PMIC */
> +			compatible = "fixed-clock";
> +			#clock-cells = <0>;
> +			clock-frequency = <32768>;
> +		};
>   	};
>   
>   	display-timings {
> @@ -286,6 +293,11 @@
>   				regulator-boot-on;
>   				regulator-always-on;
>   			};
> +
> +			EN32KHZ_AP {
> +				regulator-name = "EN32KHZ_AP";
> +				regulator-always-on;
> +			};
>   		};
>   	};
>   };
> @@ -331,6 +343,8 @@
>   
>   &rtc {
>   	status = "okay";
> +	clocks = <&clock CLK_RTC>, <&pmic_ap_clk>;
> +	clock-names = "rtc", "rtc_src";
>   };
>   
>   &tmu {

Best regards
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/exynos4210-origen.dts b/arch/arm/boot/dts/exynos4210-origen.dts
index 890525b10d22..747221bbb856 100644
--- a/arch/arm/boot/dts/exynos4210-origen.dts
+++ b/arch/arm/boot/dts/exynos4210-origen.dts
@@ -100,6 +100,13 @@ 
 			compatible = "samsung,clock-xusbxti";
 			clock-frequency = <24000000>;
 		};
+
+		pmic_ap_clk: pmic-ap-clk {
+			/* Workaround for missing clock on max8997 PMIC */
+			compatible = "fixed-clock";
+			#clock-cells = <0>;
+			clock-frequency = <32768>;
+		};
 	};
 
 	display-timings {
@@ -286,6 +293,11 @@ 
 				regulator-boot-on;
 				regulator-always-on;
 			};
+
+			EN32KHZ_AP {
+				regulator-name = "EN32KHZ_AP";
+				regulator-always-on;
+			};
 		};
 	};
 };
@@ -331,6 +343,8 @@ 
 
 &rtc {
 	status = "okay";
+	clocks = <&clock CLK_RTC>, <&pmic_ap_clk>;
+	clock-names = "rtc", "rtc_src";
 };
 
 &tmu {