On Mon, Feb 1, 2016 at 10:35 PM, Rob Herring <robh@xxxxxxxxxx> wrote: > On Fri, Jan 29, 2016 at 11:28:54AM +0700, Quan Nguyen wrote: >> Update description for X-Gene standby GPIO controller DTS binding to >> support GPIO line configuration as input, output or external IRQ pin. >> >> Signed-off-by: Y Vo <yvo@xxxxxxx> >> Signed-off-by: Quan Nguyen <qnguyen@xxxxxxx> >> --- >> .../devicetree/bindings/gpio/gpio-xgene-sb.txt | 47 ++++++++++++++++++---- >> 1 file changed, 40 insertions(+), 7 deletions(-) >> >> diff --git a/Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt b/Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt >> index dae1300..7b8b4cb 100644 >> --- a/Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt >> +++ b/Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt >> @@ -1,10 +1,20 @@ >> APM X-Gene Standby GPIO controller bindings >> >> -This is a gpio controller in the standby domain. >> - >> -There are 20 GPIO pins from 0..21. There is no GPIO_DS14 or GPIO_DS15, >> -only GPIO_DS8..GPIO_DS13 support interrupts. The IRQ mapping >> -is currently 1-to-1 on interrupts 0x28 thru 0x2d. >> +This is a gpio controller in the standby domain. It also supports interrupt in >> +some particular pins which are sourced to its parent interrupt controller >> +as diagram below: >> + +-----------------+ >> + | X-Gene standby | >> + | GPIO controller +--------- GPIO_0 >> ++------------+ | | ... >> +| Parent IRQ | | +--------- GPIO_8/EXT_INT_0 >> +| controller | EXT_INT_0 | | ... >> +| (GICv2) +-------------+ +--------- GPIO_[N+8]/EXT_INT_N >> +| | ... | | >> +| | EXT_INT_N | +--------- GPIO_[N+9] >> +| +-------------+ | ... >> +| | | +--------- GPIO_MAX >> ++------------+ +-----------------+ >> >> Required properties: >> - compatible: "apm,xgene-gpio-sb" for the X-Gene Standby GPIO controller >> @@ -15,10 +25,18 @@ Required properties: >> 0 = active high >> 1 = active low >> - gpio-controller: Marks the device node as a GPIO controller. >> -- interrupts: Shall contain exactly 6 interrupts. >> +- interrupts: The EXT_INT_0 parent interrupt resource must be listed first. >> +- interrupt-parent: Phandle of the parent interrupt controller. >> +- interrupt-cells: Should be two. >> + - first cell is 0-N coresponding for EXT_INT_0 to EXT_INT_N. >> + - second cell is used to specify flags. >> +- interrupt-controller: Marks the device node as an interrupt controller. >> +- apm,nr-gpios: Optional, specify number of gpios pin. >> +- apm,nr-irqs: Optional, specify number of interrupt pins. > > When is this not 6? > Hi Rob, by default, this should be 6, but I think this property can help in cases: + Used only 5(or less) first pin as interrupt. + For similar device which has different interrupt pins (8 for example). My idea is to make it a bit more generic by using this optional property. >> +- apm,irq-start: Optional, specify lowest gpio pin support interrupt. > > What determines this value? What value is assumed if not present? > This value will tell interrupt is support from which gpio pin, as in this case interrupt support from pin 8 (ie: only pin 8, 9,10 ... supports interrupt) as default. If not specify the default (ie: 8) will be used. Thanks, -- Quan Nguyen -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
