[PATCH] bcm2835: Add Raspberry Pi thermal sensor to the device tree

[PATCH] bcm2835: Add Raspberry Pi thermal sensor to the device tree

[Lubomir Rintel]

Driven via the Raspberry Pi VideoCore 4 firmware interface.

Signed-off-by: Lubomir Rintel <lkundrak-NGH9Lh4a5iE@public.gmane.org>
Cc: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
Cc: Lee Jones <lee-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Eric Anholt <eric-WhKQ6XTQaPysTnJN9+BGXg@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: linux-rpi-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
---
Needs the RPi firmware patchset from branch 'rpi-firmware' of 
https://github.com/anholt/linux

 .../bindings/thermal/raspberrypi,bcm2835-thermal.txt        | 13 +++++++++++++
 arch/arm/boot/dts/bcm2835-rpi.dtsi                          |  5 +++++
 2 files changed, 18 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/raspberrypi,bcm2835-thermal.txt

diff --git a/Documentation/devicetree/bindings/thermal/raspberrypi,bcm2835-thermal.txt b/Documentation/devicetree/bindings/thermal/raspberrypi,bcm2835-thermal.txt
new file mode 100644
index 0000000..f323f35
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/raspberrypi,bcm2835-thermal.txt
@@ -0,0 +1,13 @@
+Raspberry Pi Broadcom BCM2835 thermal control
+
+Required properties:
+
+- compatible : should be "raspberrypi,bcm2835-thermal"
+- firmware : the Raspberry Pi firmware node
+
+Example:
+
+thermal {
+	compatible = "raspberrypi,bcm2835-thermal";
+	firmware = <&firmware>;
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index ab5474e..727bbf8 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -20,6 +20,11 @@
 			compatible = "raspberrypi,bcm2835-firmware";
 			mboxes = <&mailbox>;
 		};
+
+		thermal {
+			compatible = "raspberrypi,bcm2835-thermal";
+			firmware = <&firmware>;
+		};
 	};
 };
 
-- 
2.4.3

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Re: [PATCH] bcm2835: Add Raspberry Pi thermal sensor to the device tree

[Stephen Warren]

On 10/11/2015 01:48 PM, Lubomir Rintel wrote:
> Driven via the Raspberry Pi VideoCore 4 firmware interface.

>  .../bindings/thermal/raspberrypi,bcm2835-thermal.txt        | 13 +++++++++++++
>  arch/arm/boot/dts/bcm2835-rpi.dtsi                          |  5 +++++

There should be a separate patch for the DT binding and DT additions,
but they can be in a series. As before, CC at least the DT binding to
the DT binding maintainers.

> diff --git a/Documentation/devicetree/bindings/thermal/raspberrypi,bcm2835-thermal.txt b/Documentation/devicetree/bindings/thermal/raspberrypi,bcm2835-thermal.txt

> +Raspberry Pi Broadcom BCM2835 thermal control
> +
> +Required properties:

This needs some more explanation of what this is intended to represent
and do. For example, what services is this node (the driver instantiated
by this node) expected to implement, and what firmware services is it
expected to rely upon?
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