| Message ID | 20200306132818.98D7F80307C2@mail.baikalelectronics.ru (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | watchdog: dw_wdt: Take Baikal-T1 DW WDT peculiarities into account | expand |
On Fri, 6 Mar 2020 16:27:42 +0300, <Sergey.Semin@baikalelectronics.ru> wrote: > From: Serge Semin <Sergey.Semin@baikalelectronics.ru> > > In case if DW Watchdog IP core is built with WDT_USE_FIX_TOP == false, > a custom timeout periods are used to preset the timer counter. In > this case that periods should be specified in a new "snps,watchdog-tops" > property of the DW watchdog dts node. > > Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> > Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru> > Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> > Cc: Paul Burton <paulburton@kernel.org> > Cc: Ralf Baechle <ralf@linux-mips.org> > --- > .../bindings/watchdog/snps,dw-wdt.yaml | 30 +++++++++++++++++++ > 1 file changed, 30 insertions(+) > Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml b/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml index 8b30f9601c38..1b3b71351628 100644 --- a/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml +++ b/Documentation/devicetree/bindings/watchdog/snps,dw-wdt.yaml @@ -46,6 +46,21 @@ properties: description: Phandle to the DW Watchdog reset lane. maxItems: 1 + snps,watchdog-tops: + description: | + DW APB Watchdog custom timer intervals - Timeout Period ranges (TOPs). + Each TOP is a number loaded into the watchdog counter at the moment of + the timer restart. The counter decrementing happens each tick of the + reference clock. Therefore the TOPs array is equivalent to an array of + the timer expiration intervals supported by the DW APB Watchdog. Note + DW APB Watchdog IP-cores might be synthesized with fixed TOP values, + in which case this property is unnecessary. + allOf: + - $ref: /schemas/types.yaml#/definitions/uint32-array + - items: + minItems: 16 + maxItems: 16 + additionalProperties: false required: @@ -63,4 +78,19 @@ examples: clocks = <&per_base_clk>; resets = <&wdt_rst>; }; + + - | + watchdog1: watchdog@ffd02000 { + compatible = "snps,dw-wdt"; + reg = <0xffd02000 0x1000>; + interrupts = <0 171 4>; + clocks = <&per_base_clk>; + clock-names = "tclk"; + snps,watchdog-tops = <0x000000FF 0x000001FF 0x000003FF + 0x000007FF 0x0000FFFF 0x0001FFFF + 0x0003FFFF 0x0007FFFF 0x000FFFFF + 0x001FFFFF 0x003FFFFF 0x007FFFFF + 0x00FFFFFF 0x01FFFFFF 0x03FFFFFF + 0x07FFFFFF>; + }; ...