Re: [PATCH] mfd: Add support for TI LMP92001

[Rob Herring <robh@xxxxxxxxxx>]

On Tue, Aug 22, 2017 at 01:26:11PM +0700, s.abhisit@xxxxxxxxx wrote:
> From: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
> 
> TI LMP92001 Analog System Monitor and Controller
> 
> 8-bit GPIOs.
> 12 DACs with 12-bit resolution.
> The GPIOs and DACs are shared port function with Cy function pin to
> take control the pin suddenly from external hardware.
> DAC's referance voltage selectable for Internal/External.
> 
> 16 + 1 ADCs with 12-bit resolution.
> Built-in internal Temperature Sensor on channel 17.
> Windows Comparator Function is supported on channel 1-3 and 9-11 for
> monitoring with interrupt signal (pending to implement for interrupt).
> ADC's referance voltage selectable for Internal/External.
> 
> Signed-off-by: Abhisit Sangjan <s.abhisit@xxxxxxxxx>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio-lmp920001  |  92 ++++
>  .../devicetree/bindings/gpio/gpio-lmp92001.txt     |  22 +
>  .../bindings/iio/adc/ti-lmp92001-adc.txt           |  21 +
>  .../bindings/iio/dac/ti-lmp92001-dac.txt           |  35 ++


> diff --git a/Documentation/devicetree/bindings/gpio/gpio-lmp92001.txt b/Documentation/devicetree/bindings/gpio/gpio-lmp92001.txt
> new file mode 100644
> index 0000000..c68784e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-lmp92001.txt
> @@ -0,0 +1,22 @@
> +* Texas Instruments' LMP92001 GPIOs
> +
> +Required properties:
> + - compatible: Must be set to "ti,lmp92001-gpio".
> + - reg: i2c chip address for the device.

No, you show this in the parent which needs to be described in 
bindings/mtd/...

You could have reg here too if all the registers for each sub-block are 
in a well defined range.

> + - gpio-controller: Marks the device node as a gpio controller.
> + - #gpio-cells : Should be two.  The first cell is the pin number and the
> +  second cell is used to specify the gpio polarity:
> +        0 = Active high
> +        1 = Active low
> +
> +Example:
> +lmp92001@20 {
> +        compatible = "ti,lmp92001";
> +        reg = <0x20>;
> +
> +        lmp92001_gpio: lmp92001-gpio {

gpio-controller {

> +                compatible = "ti,lmp92001-gpio";
> +                gpio-controller;
> +                #gpio-cells = <2>;
> +        };
> +};
> diff --git a/Documentation/devicetree/bindings/iio/adc/ti-lmp92001-adc.txt b/Documentation/devicetree/bindings/iio/adc/ti-lmp92001-adc.txt
> new file mode 100644
> index 0000000..34d7809
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/ti-lmp92001-adc.txt
> @@ -0,0 +1,21 @@
> +* Texas Instruments' LMP92001 ADCs
> +
> +Required properties:
> + - compatible: Must be set to "ti,lmp92001-adc".
> + - reg: i2c chip address for the device.

Same comment here.

> + - ti,lmp92001-adc-mode: adc operation, either continuous or single-shot.

No standard property for this?

> + - ti,lmp92001-adc-mask: bit mask for which channel is enable.
> +        0 = Off
> +        1 = On
> +
> +Example:
> +lmp92001@20 {
> +        compatible = "ti,lmp92001";
> +        reg = <0x20>;
> +
> +        lmp92001-adc {
> +                compatible = "ti,lmp92001-adc";
> +                ti,lmp92001-adc-mode = "continuous";
> +                ti,lmp92001-adc-mask = <0x00000079>;
> +        };
> +};
> \ No newline at end of file
> diff --git a/Documentation/devicetree/bindings/iio/dac/ti-lmp92001-dac.txt b/Documentation/devicetree/bindings/iio/dac/ti-lmp92001-dac.txt
> new file mode 100644
> index 0000000..882db9c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/ti-lmp92001-dac.txt
> @@ -0,0 +1,35 @@
> +* Texas Instruments' LMP92001 DACs
> +
> +Required properties:
> + - compatible: Must be set to "ti,lmp92001-dac".
> + - reg: i2c chip address for the device.
> + - ti,lmp92001-dac-hiz: hi-impedance control,
> +        1 = Forces all OUT[1:12] outputs to hi-z, 0 = normal

Just make this a boolean (i.e. no value).

> + - ti,lmp92001-dac-outx:
> +        Cy = 0, 1 = will force associated OUTx outputs to VDD
> +        Cy = 0, 0 = will force associated OUTx outputs to GND
> + - ti,lmp92001-dac-gang: What group of Cy is governed to.
> +        -----------------------------------------
> +        |  Cy   | CDAC:GANG = 0 | CDAC:GANG = 1 |
> +        -----------------------------------------
> +        |  C1   |   OUT[1:4]    |    OUT[1:3]   |
> +        -----------------------------------------
> +        |  C2   |   OUT[5:6]    |    OUT[4:6]   |
> +        -----------------------------------------
> +        |  C3   |   OUT[7:8]    |    OUT[7:9]   |
> +        -----------------------------------------
> +        |  C4   |   OUT[9:12]   |    OUT[10:12] |
> +        -----------------------------------------
> +
> +Example:
> +lmp92001@20 {
> +        compatible = "ti,lmp92001";
> +        reg = <0x20>;
> +
> +        lmp92001-dac {
> +                compatible = "ti,lmp92001-dac";
> +                ti,lmp92001-dac-hiz  = /bits/ 8 <0>;
> +                ti,lmp92001-dac-outx = /bits/ 8 <0>;
> +                ti,lmp92001-dac-gang = /bits/ 8 <0>;
> +        };
> +};
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