linux-kernel - Re: [PATCH v4 3/8] dt-bindings: i2c: iproc: make 'interrupts' optional

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Date:   Wed, 13 Feb 2019 15:16:52 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ray Jui <ray.jui@...adcom.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Mark Rutland <mark.rutland@....com>, linux-i2c@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
Subject: Re: [PATCH v4 3/8] dt-bindings: i2c: iproc: make 'interrupts'
 optional

On Mon, Feb 04, 2019 at 03:15:49PM -0800, Ray Jui wrote:
> In prep for the introduction of polling mode into the driver, update the
> binding document to make the 'interrupts' property optional
> 
> Signed-off-by: Ray Jui <ray.jui@...adcom.com>
> Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@...adcom.com>
> ---
>  .../devicetree/bindings/i2c/brcm,iproc-i2c.txt         | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
> index 81f982ccca31..d3a3620b1f06 100644
> --- a/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
> +++ b/Documentation/devicetree/bindings/i2c/brcm,iproc-i2c.txt
> @@ -9,9 +9,6 @@ Required properties:
>      Define the base and range of the I/O address space that contain the iProc
>      I2C controller registers
>  
> -- interrupts:
> -    Should contain the I2C interrupt
> -
>  - clock-frequency:
>      This is the I2C bus clock. Need to be either 100000 or 400000
>  
> @@ -21,6 +18,13 @@ Required properties:
>  - #size-cells:
>      Always 0
>  
> +Optional properties:
> +
> +- interrupts:
> +    Should contain the I2C interrupt. If unspecified, driver will fall back to
> +    polling mode

What determines when you want to use polling mode? I'm not sure DT 
is the best way to control this unless it's really a property of 
the h/w. Driver behavior is really outside the scope of the DT. u-boot 
would use polling even if an interrupt is specified, for example.

Rob