linux-kernel - Re: [PATCH 1/4] dt-bindings: regulator: Add labibb regulator

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Date:   Thu, 13 Jun 2019 09:28:08 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Nisha Kumari <nishakumari@...eaurora.org>
Cc:     broonie@...nel.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        agross@...nel.org, lgirdwood@...il.com, mark.rutland@....com,
        david.brown@...aro.org, linux-kernel@...r.kernel.org,
        kgunda@...eaurora.org, rnayak@...eaurora.org
Subject: Re: [PATCH 1/4] dt-bindings: regulator: Add labibb regulator

On Wed 12 Jun 04:00 PDT 2019, Nisha Kumari wrote:

> Adding the devicetree binding for labibb regulator.
> 
> Signed-off-by: Nisha Kumari <nishakumari@...eaurora.org>
> ---
>  .../bindings/regulator/qcom-labibb-regulator.txt   | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/regulator/qcom-labibb-regulator.txt
> 
> diff --git a/Documentation/devicetree/bindings/regulator/qcom-labibb-regulator.txt b/Documentation/devicetree/bindings/regulator/qcom-labibb-regulator.txt
> new file mode 100644
> index 0000000..79aad6f4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/qcom-labibb-regulator.txt
> @@ -0,0 +1,57 @@
> +Qualcomm's LAB(LCD AMOLED Boost)/IBB(Inverting Buck Boost) Regulator
> +
> +LAB can be used as a positive boost power supply and IBB can be used as a negative
> +boost power supply for display panels.
> +
> +Main node required properties:
> +
> +- compatible:			Must be:
> +				"qcom,lab-ibb-regulator"

In order to handle variations in future LABIBB implementations, make
this "qcom,pmi8998-lab-ibb";

> +- #address-cells:		Must be 1
> +- #size-cells:			Must be 0
> +
> +LAB subnode required properties:
> +
> +- reg:				Specifies the SPMI address and size for this peripheral.
> +- regulator-name:		A string used to describe the regulator.
> +- interrupts:			Specify the interrupts as per the interrupt
> +				encoding.
> +- interrupt-names:		Interrupt names to match up 1-to-1 with
> +				the interrupts specified in 'interrupts'
> +				property.
> +
> +IBB subnode required properties:
> +
> +- reg:				Specifies the SPMI address and size for this peripheral.
> +- regulator-name:		A string used to describe the regulator.
> +- interrupts:			Specify the interrupts as per the interrupt
> +				encoding.
> +- interrupt-names:		Interrupt names to match up 1-to-1 with
> +				the interrupts specified in 'interrupts'
> +				property.
> +
> +Example:
> +	pmi8998_lsid1: pmic@3 {
> +		qcom-labibb-regulator {

We typically want to use generic names here, but as the spmi regulator
binding suggest the use of "regulators" without a unit address that
wouldn't work.

But you can shorten this to either "labibb" or at least
"labibb-regulator".

> +			compatible = "qcom,lab-ibb-regulator";
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			lab_regulator: qcom,lab@...0 {

Don't use "qcom," in the node names.

> +				reg = <0xde00>;

Please follow the spmi-regulator and hide these in the driver.

> +				regulator-name = "lab_reg";

We know it's a regulator, so no need for _reg, which means that if you
drop "qcom," from the node name and use the node name as the default
regulator name you don't need this.

> +
> +				interrupts = <0x3 0xde 0x0 IRQ_TYPE_EDGE_RISING>;
> +				interrupt-names = "lab-sc-err";
> +			};
> +
> +			ibb_regulator: qcom,ibb@...0 {
> +				reg = <0xdc00>;
> +				regulator-name = "ibb_reg";
> +
> +				interrupts = <0x3 0xdc 0x2 IRQ_TYPE_EDGE_RISING>;
> +				interrupt-names = "ibb-sc-err";
> +			};
> +
> +		};
> +	};

Regards,
Bjorn