[PATCH 1/2] Documentation: DT: Add entry for ARM SP805-WDT
robh at kernel.org
Mon Nov 16 16:14:39 PST 2015
On Mon, Nov 16, 2015 at 02:45:25PM +0000, Mark Rutland wrote:
> On Mon, Nov 16, 2015 at 07:54:42PM +0530, Bhupesh Sharma wrote:
> > This patch adds a devicetree binding documentation for ARM's
> > SP805 WatchDog Timer.
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma at freescale.com>
> > ---
> > .../devicetree/bindings/watchdog/sp805-wdt.txt | 33 ++++++++++++++++++++
> > 1 file changed, 33 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/watchdog/sp805-wdt.txt
> > diff --git a/Documentation/devicetree/bindings/watchdog/sp805-wdt.txt b/Documentation/devicetree/bindings/watchdog/sp805-wdt.txt
> > new file mode 100644
> > index 0000000..ec70fe9
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/watchdog/sp805-wdt.txt
> > @@ -0,0 +1,33 @@
> > +* ARM SP805 Watchdog Timer (WDT) Controller
> > +
> > +SP805 WDT is a ARM Primecell Peripheral and has a standard-id register that
> > +can be used to identify the peripheral type, vendor, and revision.
> > +This value can be used for driver matching.
> > +
> > +Note that the current sp805_wdt driver relies on the 'drivers/amba/bus.c'
> > +framework to invoke the probe function of the sp805_wdt driver using the
> > +unique PRIMECELL identifiers of the sp805 wdt IP.
> This paragraph can go. We shouldn't describe kernel internals.
> > +As SP805 WDT is a primecell IP, it follows the base bindings specified in
> > +'arm/primecell.txt'
> > +
> > +Required properties:
> > +- compatible : Should be "arm,sp805-wdt", "arm,primecell"
> > +- reg : Base address and size of the watchdog timer registers.
> > +- interrupts : Should specify WDT interrupt number.
> > +
> > +Optional properties:
> > +- clocks : From common clock binding. First clock is phandle to clock for apb
> > + pclk. Additional clocks are optional.
> > +- clock-names : From common clock binding. Shall be "apb_pclk" for first clock.
> The hardware has "WDOGCLK", which is what the driver appears to expect
> first implicitly.
The h/w has 2 clocks, PCLK and WDOGCLK, so both should be described and
neither should be optional.
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