linux-kernel - Re: [PATCH 1/2] qcom: ipq4019: Add regulator support to DK04 device tree

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Date:	Tue, 5 Apr 2016 00:59:06 -0500
From:	Andy Gross <andy.gross@...aro.org>
To:	Sreedhar Sambangi <ssambang@...eaurora.org>
Cc:	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	david.brown@...aro.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, linux@....linux.org.uk,
	linux-soc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	qca-upstream.external@....qualcomm.com
Subject: Re: [PATCH 1/2] qcom: ipq4019: Add regulator support to DK04 device
 tree

On Mon, Apr 04, 2016 at 02:08:10PM -0700, Sreedhar Sambangi wrote:
>     This adds the regulator nodes to DK04 device tree to support
> 
> Change-Id: I9c1df0e720a330bf6db1889fd2247f6a70ea6faa
> Signed-off-by: Sreedhar Sambangi <ssambang@...eaurora.org>
> ---
>  .../bindings/regulator/ipq4019-regulator.txt          | 19 +++++++++++++++++++
>  arch/arm/boot/dts/qcom-ipq4019-ap.dk04.1.dtsi         | 11 +++++++++++
>  2 files changed, 30 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
> 
> diff --git a/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt b/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
> new file mode 100644
> index 0000000..9d934a4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
> @@ -0,0 +1,19 @@
> +* Qualcomm Technologies, Inc. IPQ4019 regulators
> +
> +Required properties:
> +- compatible		: Must be "regulator-ipq4019".
> +- states		: Selection of available voltages and corresponding values
> +- reg			: Register address for controlling LDO
> +- mask			: Mask value for switching voltages
> +Example:

How many LDOs are there on the IPQ4019?  Can you document all of the supplies?
You can figure this out by looking for the vdd pins in the chip documentation

> +
> +	vccq_sd0: regulator@0 {
> +		compatible = "qcom,regulator-ipq4019";
> +		regulator-name = "SD0 VccQ";
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <3000000>;
> +		states = <3000000 0x3
> +			1800000 0x1>;

So there are only 2 states?  No linear range from 1.8 to 3.3?

> +		reg = <0x01948000 0x4>;
> +		mask = <0x3>;
> +	};