Hi Lee,
On 04/18/2016 02:43 AM, Lee Jones wrote:
On Fri, 15 Apr 2016, Thor Thayer wrote:
On 03/30/2016 06:35 AM, Lee Jones wrote:
On Tue, 29 Mar 2016, tthayer@xxxxxxxxxxxxxxxxxxxxx wrote:
From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
The Altera Arria10 Devkit System Resource chip is a Multi-Function
Device, it has two subdevices:
- GPIO
- HWMON
This patch adds documentation for the Altera A10-SR DT bindings.
Signed-off-by: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
---
.../devicetree/bindings/mfd/altera-a10sr.txt | 35 ++++++++++++++++++++
1 file changed, 35 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/altera-a10sr.txt
diff --git a/Documentation/devicetree/bindings/mfd/altera-a10sr.txt b/Documentation/devicetree/bindings/mfd/altera-a10sr.txt
new file mode 100644
index 0000000..564c761
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/altera-a10sr.txt
@@ -0,0 +1,35 @@
+* Altera Arria10 Development Kit System Resource Chip
+
+Required parent device properties:
+- compatible : "altr,altr_a10sr"
+- spi-max-frequency : Maximum SPI frequency.
+- reg : the SPI Chip Select address for the Arria10 System Resource chip
DT bindings are much easier to read in the following format:
- compatible : "altr,altr_a10sr"
- spi-max-frequency : Maximum SPI frequency.
- reg : the SPI Chip Select address for the Arria10 System Resource chip
... also, sentences start with an uppercase char.
+The A10SR consists of this varied group of sub-devices:
+
+Device Description
+------ ----------
+altr_a10sr_gpio GPIO Controller
+altr_a10sr_hwmon Hardware Monitor
+
+The LEDs are implemented entirely in the device tree using
+the gpio-led framework.
This is a Linuxisum and should not live in DT bindings.
+Example:
+
+ a10-sr: a10-sr@0 {
Nodes should be named after their device 'type'.
Does this device really start a address 0?
I see in the documentation on device trees there are a number of
categories I can use. GPIO is easy because it is one of the
categories but I'm not sure about the new device I'm adding since
the a10sr is a new device.
It's always difficult with MFDs as they are by their very nature, more
than one device. But how about 'resource-manager'?
OK. Yes, that would be a good name. Thanks.
I believe I should only call out the name and address on the SPI bus like:
a10sr@0 {
Correct.
+ compatible = "altr,altr-a10sr";
+ reg = <0>;
+ spi-max-frequency = <100000>;
+
+ a10sr_gpio: a10sr_gpio {
Device type only please.
and this would be a10sr_gpio: gpio-controller {
Does that seem correct?
Also correct. No address though?
Thank you. It is at a fixed address inside the SPI device. When making
this binding I followed the format of other gpio controllers like the
tps65086 and lp3943 which didn't have an address.
Thanks for the clarification.
+ compatible = "altr,a10sr-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ ngpios = <16>;
+ };
+
+ a10sr_hwmon: a10sr_hwmon {
Device type only please.
I need to revisit where this will live (hwmon does not seem to be
the correct place) so it will change but I can follow the format
above if it is correct.
Thanks for reviewing.
+ compatible = "altr,a10sr-hwmon";
+ };
+ };
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