linux-kernel - Re: [PATCH v2 5/8] dt-bindings: iio: Add STM32 LPTimer trigger binding

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Date:   Mon, 26 Jun 2017 13:14:16 -0500
From:   Rob Herring <robh@...nel.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     lee.jones@...aro.org, benjamin.gaignard@...aro.org,
        jic23@...nel.org, thierry.reding@...il.com, mark.rutland@....com,
        alexandre.torgue@...com, mcoquelin.stm32@...il.com,
        benjamin.gaignard@...com, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH v2 5/8] dt-bindings: iio: Add STM32 LPTimer trigger
 binding

On Wed, Jun 21, 2017 at 04:30:12PM +0200, Fabrice Gasnier wrote:
> Add documentation for STMicroelectronics STM32 Low-Power Timer Trigger
> binding.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
> ---
> Changes in v2:
> - s/Low Power/Low-Power
> - remove leading 0x in example (parent node)
> - improve reg property description
> ---
>  .../bindings/iio/timer/stm32-lptimer-trigger.txt   | 23 ++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt b/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt
> new file mode 100644
> index 0000000..466d99f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt
> @@ -0,0 +1,23 @@
> +STMicroelectronics STM32 Low-Power Timer Trigger
> +
> +STM32 Low-Power Timer provides trigger source (LPTIM output) that can be used
> +by STM32 internal ADC and/or DAC.
> +
> +Must be a sub-node of an STM32 Low-Power Timer device tree node.
> +See ../mfd/stm32-lptimer.txt for details about the parent node.
> +
> +Required properties:
> +- compatible:		Must be "st,stm32-lptimer-trigger".
> +- reg:			Selects trigger hardware block. Must be 0, 1 or 2
> +			respectively for lptimer1, lptimer2 or lptimer3
> +			trigger output.

I guess this answers my question. However, this seems like abuse of the 
reg prop. This should not be how you select a trigger. The DT should 
describe all the h/w blocks and then the adc connection is a separate 
property.

Rob