linux-kernel - Re: [PATCH v2 1/2] watchdog: Add Cadence WDT driver

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Date:	Thu, 29 May 2014 10:21:06 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Harini Katakam <harinik@...inx.com>
Cc:	"wim@...ana.be" <wim@...ana.be>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"michals@...inx.com" <michals@...inx.com>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] watchdog: Add Cadence WDT driver

On Tue, May 27, 2014 at 11:18:14AM +0100, Harini Katakam wrote:
> Add Cadence WDT driver. This is used by Xilinx Zynq.
> 
> Signed-off-by: Harini Katakam <harinik@...inx.com>
> ---
> 
> Sorry for the delay in sending v2.
> v2 changes:
> - Update IO helpers.
> - Use dev_dbg instead of dev_info where possible.
> - Use watchdog_init_timeout
> - Spinlock for restart register where missing.
> - Change order of probe to move reboot notifier register to the end
> - Remove unecessary comments
> - Do clk_prepare_enabel and clk_disable_unprepare in resume/suspend
>   respectively.
> - There is an input from dts to decide whether internal reset should be
>   enabled or not. When this is enabled, reset happens wutomatically when
>   counter reaches zero. In case this is not enabled, a message is disaplayed
>   to indicate that the watchdog has timed out. Elaborated this message
>   to describe the above.

When is that useful?

[...]

> +       of_property_read_u32(pdev->dev.of_node, "reset", &wdt->rst);

For booleans use an empty property and of_property_read_bool.

[...]

> +static struct of_device_id cdns_wdt_of_match[] = {
> +       { .compatible = "xlnx,zynq-wdt-r1p2", },
> +       { .compatible = "cdns,wdt-r1p2", },

If these can currently be handled identically, why not just have
"cdns,wdt-r1p2" in the driver and in your dts have:

compatible = "xlnx,zynq-wdt-r1p2", "cdns,wdt-r1p2";

If we need to distinguish the two for some reason later we can always
add the "xlnx,zynq-wdt-r1p2" string to the driver.

Cheers,
Mark.
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