linux-kernel - Re: [PATCH V2 02/10] Documentation: devicetree: watchdog: da9062/61 watchdog timer binding

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Date:   Sun, 30 Oct 2016 23:17:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     Steve Twiss <stwiss.opensource@...semi.com>
Cc:     DEVICETREE <devicetree@...r.kernel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        LINUX-KERNEL <linux-kernel@...r.kernel.org>,
        LINUX-WATCHDOG <linux-watchdog@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Wim Van Sebroeck <wim@...ana.be>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Eduardo Valentin <edubezval@...il.com>,
        LINUX-INPUT <linux-input@...r.kernel.org>,
        LINUX-PM <linux-pm@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Support Opensource <support.opensource@...semi.com>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH V2 02/10] Documentation: devicetree: watchdog: da9062/61
 watchdog timer binding

On Wed, Oct 26, 2016 at 05:56:37PM +0100, Steve Twiss wrote:
> From: Steve Twiss <stwiss.opensource@...semi.com>
> 
> Add binding information for DA9062 and DA9061 watchdog.
> 
> Example bindings for both devices are added.
> 
> The original binding for DA9062 (only) used to reside inside the
> Documentation/devicetree/bindings/mfd/da9062.txt MFD document.
> The da9062-watchdog section was deleted in that file and replaced
> with a link to the new DA9061/62 binding information stored in this
> patch.
> 
> Signed-off-by: Steve Twiss <stwiss.opensource@...semi.com>
> 
> ---
> This patch applies against linux-next and v4.8
> 
> v1 -> v2
>  - Patch renamed from [PATCH V1 07/10] to [PATCH V2 02/10] -- these
>    changes were made to fix checkpatch warnings caused by the patch
>    set dependency order
>  - Updated the patch description to be explicit about where parts of
>    this binding had originally been stored
>  - A second example for DA9061 is provided to highlight the use of a
>    fall-back compatible option for the DA9062 watchdog driver
> 
> Hi,
> 
> This patch depends on the acceptance of DA9061 watchdog driver:
>   [PATCH V2 08/10] watchdog: da9061: watchdog driver
> 
> This previous [PATCH V1 07/10] was acked-by: Rob Herring, however changes
> in the Linux device driver have meant an additional binding example is
> necessary to describe the use of DA9061.
> 
> The Linux device driver changes for DA9061 were rejected after
> conversations with the watchdog maintainers, specifically about
> compatibility between DA9061 and DA9062 watchdog hardware components. In
> the case of the watchdog the DA9062 device driver is compatible with the
> DA9061 and for this reason there is minimal change required to the DA9062
> watchdog device driver and so the example for the DA9061 watchdog shows
> the use of a fall-back compatible string.
>  
> Regards,
> Steve Twiss, Dialog Semiconductor Ltd.
> 
> 
>  .../devicetree/bindings/watchdog/da9062-wdt.txt     | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/watchdog/da9062-wdt.txt
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/da9062-wdt.txt b/Documentation/devicetree/bindings/watchdog/da9062-wdt.txt
> new file mode 100644
> index 0000000..1f8255c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/watchdog/da9062-wdt.txt
> @@ -0,0 +1,21 @@
> +* Dialog Semiconductor DA9062/61 Watchdog Timer
> +
> +Required properties:
> +- compatible: "dlg,da9062-watchdog"
> +              "dlg,da9061-watchdog"

Similar comment here. List each valid combination.

> +
> +Example: DA9062
> +
> +	pmic0: da9062@58 {
> +		watchdog {
> +			compatible = "dlg,da9062-watchdog";
> +		};
> +	};
> +
> +Example: DA9061 using a fall-back compatible for the DA9062 watchdog driver
> +
> +	pmic0: da9061@58 {
> +		watchdog {
> +			compatible = "dlg,da9061-watchdog", "dlg,da9062-watchdog";
> +		};
> +	};
> -- 
> end-of-patch for PATCH V2
>