linux-kernel - Re: [PATCH v4 4/4] ARM: mvebu: Armada 385 GP: Add regulators to the SATA port

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Message-ID: <54B8C933.7020502@redhat.com>
Date:	Fri, 16 Jan 2015 09:17:55 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
CC:	Antoine Ténart 
	<antoine.tenart@...e-electrons.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 4/4] ARM: mvebu: Armada 385 GP: Add regulators to the
 SATA port

Hi,

On 15-01-15 15:09, Gregory CLEMENT wrote:
> Add the regulators to each SATA port.
>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>   arch/arm/boot/dts/armada-388-gp.dts | 126 ++++++++++++++++++++++++++++++++++++
>   1 file changed, 126 insertions(+)
>
> diff --git a/arch/arm/boot/dts/armada-388-gp.dts b/arch/arm/boot/dts/armada-388-gp.dts
> index 4df22bf91683..590b383db323 100644
> --- a/arch/arm/boot/dts/armada-388-gp.dts
> +++ b/arch/arm/boot/dts/armada-388-gp.dts
> @@ -173,6 +173,16 @@
>   				status = "okay";
>   				#address-cells = <1>;
>   				#size-cells = <0>;
> +
> +				sata0: sata-port@0 {
> +					reg = <0>;
> +					target-supply = <&reg_5v_sata0>;
> +				};
> +
> +				sata1: sata-port@1 {
> +					reg = <1>;
> +					target-supply = <&reg_5v_sata1>;
> +				};
>   			};
>
>   			sata@...00 {
> @@ -181,6 +191,16 @@
>   				status = "okay";
>   				#address-cells = <1>;
>   				#size-cells = <0>;
> +
> +				sata2: sata-port@0 {
> +					reg = <0>;
> +					target-supply = <&reg_5v_sata2>;
> +				};
> +
> +				sata3: sata-port@1 {
> +					reg = <1>;
> +					target-supply = <&reg_5v_sata3>;
> +				};
>   			};
>
>   			sdhci@...00 {
> @@ -278,6 +298,112 @@
>   		regulator-always-on;
>   		gpio = <&expander0 4 GPIO_ACTIVE_HIGH>;
>   	};
> +
> +	reg_sata0: pwr-sata0 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pwr_en_sata0";
> +		enable-active-high;
> +		regulator-always-on;
> +
> +	};
> +
> +	reg_5v_sata0: v5-sata0 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v5.0-sata0";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata0>;
> +	};
> +
> +	reg_12v_sata0: v12-sata0 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v12.0-sata0";
> +		regulator-min-microvolt = <12000000>;
> +		regulator-max-microvolt = <12000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata0>;
> +	};

AFAIK the separate v5 / 12v regulators you're creating here
are not used anywhere. So I guess there just here to
accurately / completely describe the power topology ?

> +
> +	reg_sata1: pwr-sata1 {
> +		regulator-name = "pwr_en_sata1";
> +		compatible = "regulator-fixed";
> +		regulator-min-microvolt = <12000000>;
> +		regulator-max-microvolt = <12000000>;
> +		enable-active-high;
> +		regulator-always-on;


The always on here seems to a bit weird, wasn't the
whole purpose of this patch set to teach ahci_platform
to turn it on as needed ?

You do probably want to put a regulator-boot-on here so
that disks do not get an unwanted powercycle (bad for
their lifetime) when the firmware has already turned on
the disk. Downside of using regulator-boot-on is that if
the power is not actually turned on no power-on-delay is
done, but we're not using a power on delay anyways.

The same goes for reg_sata2 & reg_sata3.

> +		gpio = <&expander0 3 GPIO_ACTIVE_HIGH>;
> +	};
> +
> +	reg_5v_sata1: v5-sata1 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v5.0-sata1";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata1>;
> +	};
> +
> +	reg_12v_sata1: v12-sata1 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v12.0-sata1";
> +		regulator-min-microvolt = <12000000>;
> +		regulator-max-microvolt = <12000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata1>;
> +	};
> +
> +	reg_sata2: pwr-sata2 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pwr_en_sata2";
> +		enable-active-high;
> +		regulator-always-on;
> +		gpio = <&expander0 11 GPIO_ACTIVE_HIGH>;
> +	};
> +
> +	reg_5v_sata2: v5-sata2 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v5.0-sata2";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata2>;
> +	};
> +
> +	reg_12v_sata2: v12-sata2 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v12.0-sata2";
> +		regulator-min-microvolt = <12000000>;
> +		regulator-max-microvolt = <12000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata2>;
> +	};
> +
> +	reg_sata3: pwr-sata3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "pwr_en_sata3";
> +		enable-active-high;
> +		regulator-always-on;
> +		gpio = <&expander0 12 GPIO_ACTIVE_HIGH>;
> +	};
> +
> +	reg_5v_sata3: v5-sata3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v5.0-sata3";
> +		regulator-min-microvolt = <5000000>;
> +		regulator-max-microvolt = <5000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata3>;
> +	};
> +
> +	reg_12v_sata3: v12-sata3 {
> +		compatible = "regulator-fixed";
> +		regulator-name = "v12.0-sata3";
> +		regulator-min-microvolt = <12000000>;
> +		regulator-max-microvolt = <12000000>;
> +		regulator-always-on;
> +		vin-supply = <&reg_sata3>;
> +	};
>   };
>
>   &pinctrl {
>

Regards,

Hans
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