From mboxrd@z Thu Jan 1 00:00:00 1970 From: Quan Nguyen Subject: Re: [PATCH v5 2/3] Documentation: gpio: Update description for X-Gene standby GPIO controller DTS binding Date: Tue, 2 Feb 2016 08:46:25 +0700 Message-ID: References: <1454041735-8434-1-git-send-email-qnguyen@apm.com> <1454041735-8434-3-git-send-email-qnguyen@apm.com> <20160201153502.GA19725@rob-hp-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <20160201153502.GA19725@rob-hp-laptop> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Rob Herring Cc: Linus Walleij , linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Thomas Gleixner , Jason Cooper , Marc Zyngier , Y Vo , Phong Vo , Loc Ho , Feng Kan , Duc Dang , patches List-Id: linux-gpio@vger.kernel.org On Mon, Feb 1, 2016 at 10:35 PM, Rob Herring 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 >> Signed-off-by: Quan Nguyen >> --- >> .../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-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 From: qnguyen@apm.com (Quan Nguyen) Date: Tue, 2 Feb 2016 08:46:25 +0700 Subject: [PATCH v5 2/3] Documentation: gpio: Update description for X-Gene standby GPIO controller DTS binding In-Reply-To: <20160201153502.GA19725@rob-hp-laptop> References: <1454041735-8434-1-git-send-email-qnguyen@apm.com> <1454041735-8434-3-git-send-email-qnguyen@apm.com> <20160201153502.GA19725@rob-hp-laptop> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Feb 1, 2016 at 10:35 PM, Rob Herring 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 >> Signed-off-by: Quan Nguyen >> --- >> .../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