On 28/05/13 23:05, Stephen Warren wrote: > On 05/28/2013 03:25 PM, Jon Hunter wrote: >> >> On 27/05/13 15:37, Afzal Mohammed wrote: >>> AM43x timer bindings. >>> >>> Signed-off-by: Afzal Mohammed <afzal@xxxxxx> >>> --- >>> Documentation/devicetree/bindings/arm/omap/timer.txt | 2 ++ >>> 1 file changed, 2 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/arm/omap/timer.txt b/Documentation/devicetree/bindings/arm/omap/timer.txt >>> index d02e27c..70cb398 100644 >>> --- a/Documentation/devicetree/bindings/arm/omap/timer.txt >>> +++ b/Documentation/devicetree/bindings/arm/omap/timer.txt >>> @@ -14,6 +14,8 @@ Required properties: >>> ti,omap5430-timer (applicable to OMAP543x devices) >>> ti,am335x-timer (applicable to AM335x devices) >>> ti,am335x-timer-1ms (applicable to AM335x devices) >>> + "ti,am4372-timer-1ms", "ti,am335x-timer-1ms" for AM43x 1ms timer >>> + "ti,am4372-timer", "ti,am335x-timer" for AM43x timers other than 1ms one >>> >>> - reg: Contains timer register address range (base address and >>> length). >> >> If you are adding more compatibility strings, then this implies that the >> AM43x timers are not 100% compatible with any other device listed (such >> as am335x or any omap device). That's fine but you should state that in >> the changelog. If the AM43x timer registers are 100% compatible with >> existing devices you should not add these. > > I'm not sure that's true; .dts files should always include a compatible > value that describes the most specific model of the HW, plus any > baseline compatible value that the HW is compatible with. This allows > any required quirks/fixes/... to be applied for the specific HW model > later even if nobody knows right now they'll be needed. Hence, defining > new compatible values doesn't necessarily mean incompatible HW. Yes that does seem to agree with what Grant had told me in the past [1]. So this is ok then. However, I still think that the changelog needs to be vastly improved and more explicit about the changes. Cheers Jon [1] http://thread.gmane.org/gmane.linux.ports.arm.omap/90551/focus=26447 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
