From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Agner Subject: Re: [PATCH 14/18] gpio: vf610: add support for WKPU unit Date: Thu, 17 Mar 2016 15:12:24 -0700 Message-ID: <752bcc77253ae252c5a9928116b96b44@agner.ch> References: <1457576219-7971-1-git-send-email-stefan@agner.ch> <1457576219-7971-15-git-send-email-stefan@agner.ch> <20160317200054.GA3799@rob-hp-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160317200054.GA3799@rob-hp-laptop> Sender: linux-clk-owner@vger.kernel.org To: Rob Herring Cc: shawnguo@kernel.org, mturquette@baylibre.com, sboyd@codeaurora.org, kernel@pengutronix.de, sergeimir@emcraft.com, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org List-Id: devicetree@vger.kernel.org Hi Rob, On 2016-03-17 13:00, Rob Herring wrote: > On Wed, Mar 09, 2016 at 06:16:55PM -0800, Stefan Agner wrote: >> WKPU unit support within the VF610 GPIO driver. The WKPU unit allows >> some GPIO to be the wakeup source from lowest power modes LPSTOPx. >> The relationship between the GPIO banks and the WKPU GPIO numbering >> can be derived from the device tree property fsl,gpio-wakeup. >> >> Signed-off-by: Stefan Agner >> --- >> .../devicetree/bindings/gpio/gpio-vf610.txt | 6 + >> drivers/gpio/gpio-vf610.c | 151 +++++++++++++++++++++ >> 2 files changed, 157 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/gpio/gpio-vf610.txt b/Documentation/devicetree/bindings/gpio/gpio-vf610.txt >> index 436cc99..985ddfd 100644 >> --- a/Documentation/devicetree/bindings/gpio/gpio-vf610.txt >> +++ b/Documentation/devicetree/bindings/gpio/gpio-vf610.txt >> @@ -22,6 +22,12 @@ Required properties for GPIO node: >> 4 = active high level-sensitive. >> 8 = active low level-sensitive. >> >> +Option properties: > > Optional > >> +- fsl,gpio-wakeup : map GPIOs to WKPU unit, 3 argument cells per phandle > > phandle to what? > >> + cell 1: First GPIO (relative to the GPIO block) >> + cell 2: First GPIO of the WKPU unit >> + cell 3: Number of consecutive GPIO's > > An interrupt-map could work here instead even though I'm guessing you > don't make the WKPU an interrupt parent. Your table would look something > like this: > > GPIO#> > Hm, that would need two interrupt parents since the main interrupt for the GPIO's would still be GIC... >> + >> Note: Each GPIO port should have an alias correctly numbered in "aliases" >> node. >> >> diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c >> index 1a022be..650a41a 100644 >> --- a/drivers/gpio/gpio-vf610.c >> +++ b/drivers/gpio/gpio-vf610.c > > The WKPU seems to purely be an interrupt controller. Perhaps you should > use stacked irq domain here. Then it would not be tied into the GPIO > controller at all. It actually allows to configure pull-up/downs, that is why I chose to implement it as a GPIO controller. Although the pull-up/down part is not implemented yet. But when I think about it, it actually is probably more a pinctrl with interrupt capabilities? -- Stefan