On Sun, Dec 06, 2015 at 08:52:15PM +0100, Markus Pargmann wrote:
> The documentation describes the bindings for the imx25 GCQ unit which is
> essentially a generic conversion queue using the imx25 ADC.
>
> Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
> ---
>
> Notes:
> Changes in v9:
> - Added the dt-bindings header to this patch instead of the driver
>
> Changes in v6:
> - Changed bindings to use adc-refp and adc-refn. Also a bit of cleanup in the
> setup routine.
>
> Changes in v5:
> - Fixed locking
> - Removed module owner
>
> .../devicetree/bindings/iio/adc/fsl,imx25-gcq.txt | 58 ++++++++++++++++++++++
> include/dt-bindings/iio/adc/fsl-imx25-gcq.h | 18 +++++++
> 2 files changed, 76 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
> create mode 100644 include/dt-bindings/iio/adc/fsl-imx25-gcq.h
>
> diff --git a/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
> new file mode 100644
> index 000000000000..b0866d36a307
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/fsl,imx25-gcq.txt
> @@ -0,0 +1,58 @@
> +Freescale i.MX25 ADC GCQ device
> +
> +This is a generic conversion queue device that can convert any of the
> +analog inputs using the ADC unit of the i.MX25.
> +
> +Required properties:
> + - compatible: Should be "fsl,imx25-gcq".
> + - reg: Should be the register range of the module.
> + - interrupts: Should be the interrupt number of the module.
> + Typically this is <1>.
> + - interrupt-parent: phandle to the tsadc module of the i.MX25.
> + - #address-cells: Should be <1> (setting for the subnodes)
> + - #size-cells: Should be <0> (setting for the subnodes)
> +
> +Optional properties:
> + - vref-ext-supply: The regulator supplying the ADC reference voltage.
> + Required when at least one subnode uses the this reference.
> + - vref-xp-supply: The regulator supplying the ADC reference voltage on pin XP.
> + Required when at least one subnode uses this reference.
> + - vref-yp-supply: The regulator supplying the ADC reference voltage on pin YP.
> + Required when at least one subnode uses this reference.
> +
> +Sub-nodes:
> +Optionally you can define subnodes which define the reference voltage
> +for the analog inputs.
> +
> +Required properties for subnodes:
> + - reg: Should be the number of the analog input.
> + 0: xp
> + 1: yp
> + 2: xn
> + 3: yn
> + 4: wiper
> + 5: inaux0
> + 6: inaux1
> + 7: inaux2
> +Optional properties for subnodes:
> + - fsl,adc-refp: specifies the positive reference input as defined in
> + <dt-bindings/iio/adc/fsl-imx25-gcq.h>
> + - fsl,adc-refn: specifies the negative reference input as defined in
> + <dt-bindings/iio/adc/fsl-imx25-gcq.h>
> +
> +Example:
> +
> + adc: adc@50030800 {
> + compatible = "fsl,imx25-gcq";
> + reg = <0x50030800 0x60>;
> + interrupt-parent = <&tscadc>;
> + interrupts = <1>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + inaux@5 {
> + reg = <5>;
> + fsl,adc-refp = <MX25_ADC_REFP_INT>;
> + fsl,adc-refn = <MX25_ADC_REFN_NGND>;
> + };
> + };
> diff --git a/include/dt-bindings/iio/adc/fsl-imx25-gcq.h b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
> new file mode 100644
> index 000000000000..87abdd4a7674
> --- /dev/null
> +++ b/include/dt-bindings/iio/adc/fsl-imx25-gcq.h
> @@ -0,0 +1,18 @@
> +/*
> + * This header provides constants for configuring the I.MX25 ADC
> + */
> +
> +#ifndef _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
> +#define _DT_BINDINGS_IIO_ADC_FS_IMX25_GCQ_H
> +
> +#define MX25_ADC_REFP_YP 0 /* YP voltage reference */
> +#define MX25_ADC_REFP_XP 1 /* XP voltage reference */
> +#define MX25_ADC_REFP_EXT 2 /* External voltage reference */
> +#define MX25_ADC_REFP_INT 3 /* Internal voltage reference */
> +
> +#define MX25_ADC_REFN_XN 0 /* XN ground reference */
> +#define MX25_ADC_REFN_YN 1 /* YN ground reference */
> +#define MX25_ADC_REFN_NGND 2 /* Internal ground reference */
> +#define MX25_ADC_REFN_NGND2 3 /* External ground reference */
> +
> +#endif
> --
> 2.6.2
>
> --
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