Hi Lee,
On 03/30/2016 06:35 AM, Lee Jones wrote:
On Tue, 29 Mar 2016, tthayer@xxxxxxxxxxxxxxxxxxxxx wrote:
From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
[..snip..]
--- /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.
OK.
+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.
I was following the format of other mfd binding documents such as
Documentation/devicetree/bindings/mfd/da9055.txt so I'll need your help
understanding this.
I'm not familiar with the phrase Linuxisum. A Google search turns up
several threads referencing Linuxisum but I can't seem to find the
definition. One thread seems to imply that an existing driver such as
GPIO is a Linuxisum and should not be re-defined. Am I understanding
correctly?
+Example:
+
+ a10-sr: a10-sr@0 {
Nodes should be named after their device 'type'.
Does this device really start a address 0?
OK. If I understand, this should be named after mfd then?
+ compatible = "altr,altr-a10sr";
+ reg = <0>;
+ spi-max-frequency = <100000>;
+
+ a10sr_gpio: a10sr_gpio {
Device type only please.
And this would be a gpio?
Thanks for your comments and for reviewing!
+ compatible = "altr,a10sr-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ ngpios = <16>;
+ };
+
+ a10sr_hwmon: a10sr_hwmon {
Device type only please.
+ compatible = "altr,a10sr-hwmon";
+ };
+ };
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