linux-kernel - Re: [PATCH 1/4] i2c: pca-platform: add devicetree awareness

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Date:   Sun, 18 Jun 2017 09:04:53 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     wsa@...-dreams.de, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 1/4] i2c: pca-platform: add devicetree awareness

On Tue, Jun 13, 2017 at 01:56:38PM +1200, Chris Packham wrote:
> Allow devices that use this driver to be registered via a
> devicetree.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>  .../devicetree/bindings/i2c/i2c-pca-platform.txt    | 18 ++++++++++++++++++

It's preferred to split bindings to separate patch.

>  drivers/i2c/busses/i2c-pca-platform.c               | 21 +++++++++++++++++++++
>  2 files changed, 39 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-pca-platform.txt
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-pca-platform.txt b/Documentation/devicetree/bindings/i2c/i2c-pca-platform.txt
> new file mode 100644
> index 000000000000..47410bda3f37
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-pca-platform.txt
> @@ -0,0 +1,18 @@
> +* NXP PCA PCA9564/PCA9665 I2C controller
> +
> +The PCA9564/PCA9665 serves as an interface between most standard
> +parallel-bus microcontrollers/microprocessors and the serial I2C-bus
> +and allows the parallel bus system to communicate bi-directionally
> +with the I2C-bus.
> +
> +Required properties :
> +
> + - reg : Offset and length of the register set for the device
> + - compatible : one of "nxp,pca9564" or "nxp,pca9665"
> +
> +Optional properties
> + - interrupts : the interrupt number
> + - interrupt-parent : the phandle for the interrupt controller.
> +   If an interrupt is not specified polling will be used.
> + - gpios : gpio phandle to control device reset.

reset-gpios and state the active state.

> + - clock-frequency : I2C bus frequency.
> \ No newline at end of file

^^^