linux-kernel - Re: [PATCH v2 3/3] Documentation: mfd: Add binding document for S2MPA01

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Date:	Wed, 12 Feb 2014 15:02:36 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Sangbeom Kim <sbkim73@...sung.com>,
	Lee Jones <lee.jones@...aro.org>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Rob Herring <rob.herring@...aro.org>
Subject: Re: [PATCH v2 3/3] Documentation: mfd: Add binding document for S2MPA01

On 9 January 2014 16:52, Sachin Kamat <sachin.kamat@...aro.org> wrote:
> Added initial binding documentation for S2MPA01 MFD.
>
> Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
> ---
> * Re-organised as suggested by Mark Rutland.
> ---
>  Documentation/devicetree/bindings/mfd/s2mpa01.txt |   86 +++++++++++++++++++++
>  1 file changed, 86 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/s2mpa01.txt
>
> diff --git a/Documentation/devicetree/bindings/mfd/s2mpa01.txt b/Documentation/devicetree/bindings/mfd/s2mpa01.txt
> new file mode 100644
> index 000000000000..70879b92b24b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/s2mpa01.txt
> @@ -0,0 +1,86 @@
> +
> +* Samsung S2MPA01 Voltage and Current Regulator
> +
> +The Samsung S2MPA01 is a multi-function device which includes high
> +efficiency buck converters including Dual-Phase buck converter, various LDOs,
> +and an RTC. It is interfaced to the host controller using an I2C interface.
> +Each sub-block is addressed by the host system using different I2C slave
> +addresses.
> +
> +Required properties:
> +- compatible: Should be "samsung,s2mpa01-pmic".
> +- reg: Specifies the I2C slave address of the PMIC block. It should be 0x66.
> +
> +Optional properties:
> +- interrupt-parent: Specifies the phandle of the interrupt controller to which
> +  the interrupts from s2mpa01 are delivered to.
> +- interrupts: Interrupt specifier for interrupt source (connected to SoC).
> +
> +Optional nodes:
> +- regulators: The regulators of s2mpa01 that have to be instantiated should be
> +  included in a sub-node named 'regulators'. Regulator nodes and constraints
> +  included in this sub-node use the standard regulator bindings which are
> +  documented elsewhere.
> +
> +Properties for BUCK regulator nodes:
> + regulator-ramp-delay for BUCKs = [6250/12500(default)/25000/50000] uV/us
> +
> + BUCK[1/2/3/4] supports disabling ramp delay on hardware, so explictly
> + regulator-ramp-delay = <0> can be used for them to disable ramp delay.
> + In the absence of the regulator-ramp-delay property, the default ramp
> + delay will be used.
> +
> +  NOTE: Some BUCKs share the ramp rate setting i.e. same ramp value will be set
> +  for a particular group of BUCKs. So provide same regulator-ramp-delay<value>.
> +  Grouping of BUCKs sharing ramp rate setting is as follow : BUCK[1, 6],
> +  BUCK[2, 4], and BUCK[8, 9, 10]
> +
> +The following are the names of the regulators that the s2mpa01 PMIC block
> +supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
> +as per the datasheet of s2mpa01.
> +
> +       - LDOn
> +                 - valid values for n are 1 to 26
> +                 - Example: LDO1, LD02, LDO26
> +       - BUCKn
> +                 - valid values for n are 1 to 10.
> +                 - Example: BUCK1, BUCK2, BUCK9
> +
> +Example:
> +
> +       s2mpa01_pmic@66 {
> +               compatible = "samsung,s2mpa01-pmic";
> +               reg = <0x66>;
> +
> +               regulators {
> +                       ldo1_reg: LDO1 {
> +                               regulator-name = "VDD_ALIVE";
> +                               regulator-min-microvolt = <1000000>;
> +                               regulator-max-microvolt = <1000000>;
> +                       };
> +
> +                       ldo2_reg: LDO2 {
> +                               regulator-name = "VDDQ_MMC2";
> +                               regulator-min-microvolt = <2800000>;
> +                               regulator-max-microvolt = <2800000>;
> +                               regulator-always-on;
> +                       };
> +
> +                       buck1_reg: BUCK1 {
> +                               regulator-name = "vdd_mif";
> +                               regulator-min-microvolt = <950000>;
> +                               regulator-max-microvolt = <1350000>;
> +                               regulator-always-on;
> +                               regulator-boot-on;
> +                       };
> +
> +                       buck2_reg: BUCK2 {
> +                               regulator-name = "vdd_arm";
> +                               regulator-min-microvolt = <950000>;
> +                               regulator-max-microvolt = <1350000>;
> +                               regulator-always-on;
> +                               regulator-boot-on;
> +                               regulator-ramp-delay = <50000>;
> +                       };
> +               };
> +       };
> --
> 1.7.9.5
>

Can I please have an ack from the DT maintainers so that this series
can be picked by Lee.

-- 
With warm regards,
Sachin
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