From: Eric Anholt <eric@anholt.net>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-rpi-kernel@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Stephen Warren <swarren@wwwdotorg.org>,
Lee Jones <lee@kernel.org>,
bcm-kernel-feedback-list@broadcom.com,
Alexandre Courbot <gnurou@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Gerd Hoffmann <kraxel@redhat.com>, Eric Anholt <eric@anholt.net>
Subject: [PATCH 1/3] dt-bindings: Add a binding for the RPi firmware GPIO driver.
Date: Mon, 19 Sep 2016 17:13:12 +0100 [thread overview]
Message-ID: <20160919161314.25858-1-eric@anholt.net> (raw)
The RPi firmware exposes all of the board's GPIO lines through
property calls. Linux chooses to control most lines directly through
the pinctrl driver, but for the FXL6408 GPIO expander on the Pi3, we
need to access them through the firmware.
Signed-off-by: Eric Anholt <eric@anholt.net>
---
.../bindings/gpio/gpio-raspberrypi-firmware.txt | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-raspberrypi-firmware.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-raspberrypi-firmware.txt b/Documentation/devicetree/bindings/gpio/gpio-raspberrypi-firmware.txt
new file mode 100644
index 000000000000..2b635c23a6f8
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-raspberrypi-firmware.txt
@@ -0,0 +1,22 @@
+Raspberry Pi power domain driver
+
+Required properties:
+
+- compatible: Should be "raspberrypi,firmware-gpio"
+- gpio-controller: Marks the device node as a gpio controller
+- #gpio-cells: Should be <2> for GPIO number and flags
+- ngpios: Number of GPIO lines to control. See gpio.txt
+- firmware: Reference to the RPi firmware device node
+- raspberrypi,firmware-gpio-offset:
+ Number the firmware uses for the first GPIO line
+ controlled by this driver
+
+Example:
+fxl6408: firmware-gpio-128 {
+ compatible = "raspberrypi,firmware-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ firmware = <&firmware>;
+ ngpios = <8>;
+ raspberrypi,firmware-gpio-offset = <128>;
+};
--
2.9.3
next reply other threads:[~2016-09-19 16:13 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-19 16:13 Eric Anholt [this message]
2016-09-19 16:13 ` [PATCH 2/3] gpio: Add a driver for the Raspberry Pi's firmware GPIO calls Eric Anholt
2016-09-23 9:08 ` Linus Walleij
2016-09-23 13:15 ` Eric Anholt
2016-09-23 14:08 ` Linus Walleij
2016-09-24 7:01 ` Eric Anholt
2016-10-06 8:16 ` Linus Walleij
2016-09-26 16:46 ` Stephen Warren
2016-09-23 19:00 ` Stefan Wahren
2016-09-19 16:13 ` [PATCH 3/3] arm64: Add the Raspberry Pi firmware's interface to the FXL6408 Eric Anholt
2016-09-22 20:44 ` Gerd Hoffmann
2016-09-23 9:23 ` Linus Walleij
2016-09-23 8:57 ` [PATCH 1/3] dt-bindings: Add a binding for the RPi firmware GPIO driver Linus Walleij
2016-09-23 13:08 ` Eric Anholt
2016-09-23 13:53 ` Linus Walleij
2016-09-26 16:40 ` Stephen Warren
2016-09-23 18:39 ` Stefan Wahren
2016-09-26 16:38 ` Stephen Warren
2016-09-26 18:42 ` Stefan Wahren
2016-09-28 17:54 ` Stephen Warren
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