From: Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
To: Dave Stevenson
<dave.stevenson-FnsA7b+Nu9XbIbC87yuRow@public.gmane.org>,
Eric Anholt <eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>,
Stefan Wahren <stefan.wahren-eS4NqCHxEME@public.gmane.org>,
Linus Walleij
<linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>,
linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Michael Zoran <mzoran-O+n0w2l5AFbk1uMJSBkQmQ@public.gmane.org>,
linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Frank Rowand
<frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: [PATCH v3 2/4] dt-bindings: gpio: add raspberry pi GPIO expander binding
Date: Tue, 16 Jan 2018 14:45:08 +0200 [thread overview]
Message-ID: <248ce2c6c79b281261184a0ccde8513a9074af4c.1516105893.git.baruch@tkos.co.il> (raw)
In-Reply-To: <cover.1516105893.git.baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
The Raspberry Pi 3 GPIO expander is controlled by the VC4 firmware over
I2C. The firmware mailbox interface allows the ARM core to control the
GPIO lines.
Signed-off-by: Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
---
v3:
* Rename node name.
v2:
* Rename compatible string to raspberrypi,firmware-gpio
---
.../bindings/gpio/raspberrypi,firmware-gpio.txt | 24 ++++++++++++++++++++++
1 file changed, 24 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt
diff --git a/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt
new file mode 100644
index 000000000000..936dc59eba12
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/raspberrypi,firmware-gpio.txt
@@ -0,0 +1,24 @@
+Raspberry Pi GPIO expander
+
+The Raspberry Pi 3 GPIO expander is controlled by the VC4 firmware. The
+firmware exposes a mailbox interface that allows the ARM core to control the
+GPIO lines on the expander.
+
+Required properties:
+
+- compatible : Should be "raspberrypi,firmware-gpio"
+- gpio-controller : Marks the device node as a gpio controller
+- #gpio-cells : Should be two. The first cell is the pin number, and
+ the second cell is used to specify the gpio polarity:
+ 0 = active high
+ 1 = active low
+- firmware : Reference to the RPi firmware device node
+
+Example:
+
+expgpio: gpio-expander {
+ compatible = "raspberrypi,firmware-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ firmware = <&firmware>;
+};
--
2.15.1
--
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next prev parent reply other threads:[~2018-01-16 12:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-16 12:45 [PATCH v3 0/4] gpio: driver for the RPi3 GPIO expander Baruch Siach
2018-01-16 12:45 ` [PATCH v3 1/4] ARM: bcm2835: sync firmware properties with downstream Baruch Siach
[not found] ` <cover.1516105893.git.baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
2018-01-16 12:45 ` Baruch Siach [this message]
2018-01-29 16:11 ` [PATCH v3 2/4] dt-bindings: gpio: add raspberry pi GPIO expander binding Rob Herring
2018-01-29 16:30 ` Baruch Siach
2018-02-06 13:42 ` [PATCH v3 0/4] gpio: driver for the RPi3 GPIO expander Linus Walleij
[not found] ` <CACRpkdZAtVfAU-k9EUihH6peY2d1Ntn3jboVMBn9adReNLupow-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-02-06 16:27 ` Baruch Siach
2018-02-07 9:13 ` Linus Walleij
2018-02-07 9:33 ` Stefan Wahren
[not found] ` <a3e4ba9a-60bf-5038-7385-8cb3d2667ed2-eS4NqCHxEME@public.gmane.org>
2018-02-07 9:38 ` Baruch Siach
2018-02-07 10:20 ` Stefan Wahren
2018-01-16 12:45 ` [PATCH v3 3/4] gpio: raspberrypi-exp: Driver for RPi3 GPIO expander via mailbox service Baruch Siach
[not found] ` <1a2829a6cb5edc951f9d8f322882916ab9cea67c.1516105893.git.baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>
2018-01-19 18:50 ` Stefan Wahren
2018-01-16 12:45 ` [PATCH v3 4/4] ARM: dts: bcm2837-rpi-3-b: add GPIO expander Baruch Siach
2018-01-17 8:30 ` Stefan Wahren
[not found] ` <6c07ab6a-a2c6-284e-6205-58d2512d0256-eS4NqCHxEME@public.gmane.org>
2018-01-17 9:39 ` Linus Walleij
2018-01-19 18:52 ` Stefan Wahren
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