linux-kernel - Re: [PATCH v1 3/5] dts: add nxp,quartz_load

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Date:   Thu, 13 Sep 2018 21:14:50 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Andrew Jeffery <andrew@...id.au>,
        Fabio Estevam <fabio.estevam@....com>,
        Joel Stanley <joel@....id.au>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
        Søren Andersen <san@...v.dk>
Subject: Re: [PATCH v1 3/5] dts: add nxp,quartz_load_12.5pf to all pcf8523
 nodes

On 07/09/2018 21:35:06+0200, Sam Ravnborg wrote:
> From: Søren Andersen <san@...v.dk>
> 
> Add "nxp,quartz_load_12.5pf" to all pcf8523 nodes.
> 
> The device tree binding for the pcf8523 now includes
> a property "nxp,quartz_load_12.5pf" to specify
> that the connected x-tal has an internal capacitance
> of 12.5 pF.
> Add this to all pcf8523 nodes, because this was implicit before,
> at least in the Linux kernel where the driver was hardcoded
> to set the rtc to use 12.5 pF.
> 

Well, this patch is not needed as we should not break the DT ABI. See
comment on the next patch...

> Signed-off-by: Søren Andersen <san@...v.dk>
> Signed-off-by: Sam Ravnborg <sam@...nborg.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Joel Stanley <joel@....id.au>
> Cc: Andrew Jeffery <andrew@...id.au>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Fabio Estevam <fabio.estevam@....com>
> Cc: Russell King <linux@...linux.org.uk>
> ---
>  arch/arm/boot/dts/aspeed-bmc-opp-lanyang.dts | 1 +
>  arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts   | 1 +
>  arch/arm/boot/dts/imx6q-h100.dts             | 1 +
>  arch/arm/boot/dts/imx6q-novena.dts           | 1 +
>  arch/arm/boot/dts/imx6qdl-cubox-i.dtsi       | 1 +
>  arch/arm/boot/dts/imx6qdl-hummingboard.dtsi  | 1 +
>  arch/arm/boot/dts/imx6qdl-hummingboard2.dtsi | 1 +
>  7 files changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-lanyang.dts b/arch/arm/boot/dts/aspeed-bmc-opp-lanyang.dts
> index d598b6391362..d1a0e3521e2b 100644
> --- a/arch/arm/boot/dts/aspeed-bmc-opp-lanyang.dts
> +++ b/arch/arm/boot/dts/aspeed-bmc-opp-lanyang.dts
> @@ -200,6 +200,7 @@
>  	rtc@68 {
>  		compatible = "nxp,pcf8523";
>  		reg = <0x68>;
> +		nxp,quartz_load_12.5pf;
>  	};
>  
>  	tmp75@48 {
> diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts b/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts
> index 2c5aa90a546d..b5088414e610 100644
> --- a/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts
> +++ b/arch/arm/boot/dts/aspeed-bmc-opp-zaius.dts
> @@ -201,6 +201,7 @@
>  	rtc@68 {
>  		compatible = "nxp,pcf8523";
>  		reg = <0x68>;
> +		nxp,quartz_load_12.5pf;
>  	};
>  
>  	ucd90160@64 {
> diff --git a/arch/arm/boot/dts/imx6q-h100.dts b/arch/arm/boot/dts/imx6q-h100.dts
> index 714e09e04dcb..3b6116069b11 100644
> --- a/arch/arm/boot/dts/imx6q-h100.dts
> +++ b/arch/arm/boot/dts/imx6q-h100.dts
> @@ -173,6 +173,7 @@
>  	rtc: pcf8523@68 {
>  		compatible = "nxp,pcf8523";
>  		reg = <0x68>;
> +		nxp,quartz_load_12.5pf;
>  	};
>  
>  	sgtl5000: sgtl5000@a {
> diff --git a/arch/arm/boot/dts/imx6q-novena.dts b/arch/arm/boot/dts/imx6q-novena.dts
> index fcd824dc485b..6a2eaaa6e220 100644
> --- a/arch/arm/boot/dts/imx6q-novena.dts
> +++ b/arch/arm/boot/dts/imx6q-novena.dts
> @@ -257,6 +257,7 @@
>  	rtc: pcf8523@68 {
>  		compatible = "nxp,pcf8523";
>  		reg = <0x68>;
> +		nxp,quartz_load_12.5pf;
>  	};
>  
>  	sbs_battery: bq20z75@b {
> diff --git a/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi b/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
> index 9332a31e6c8b..e0f601bce3d3 100644
> --- a/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-cubox-i.dtsi
> @@ -143,6 +143,7 @@
>  	rtc@68 {
>  		compatible = "nxp,pcf8523";
>  		reg = <0x68>;
> +		nxp,quartz_load_12.5pf;
>  	};
>  };
>  
> diff --git a/arch/arm/boot/dts/imx6qdl-hummingboard.dtsi b/arch/arm/boot/dts/imx6qdl-hummingboard.dtsi
> index 0e64016e765f..7848b818078e 100644
> --- a/arch/arm/boot/dts/imx6qdl-hummingboard.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-hummingboard.dtsi
> @@ -189,6 +189,7 @@
>  	rtc@68 {
>  		compatible = "nxp,pcf8523";
>  		reg = <0x68>;
> +		nxp,quartz_load_12.5pf;
>  	};
>  
>  	/* Pro baseboard model */
> diff --git a/arch/arm/boot/dts/imx6qdl-hummingboard2.dtsi b/arch/arm/boot/dts/imx6qdl-hummingboard2.dtsi
> index c413f9c3540f..7bc264234085 100644
> --- a/arch/arm/boot/dts/imx6qdl-hummingboard2.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-hummingboard2.dtsi
> @@ -222,6 +222,7 @@
>  	pcf8523: rtc@68 {
>  		compatible = "nxp,pcf8523";
>  		reg = <0x68>;
> +		nxp,quartz_load_12.5pf;
>  	};
>  
>  	sgtl5000: codec@a {
> -- 
> 2.12.0
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com