Hi All,
On 2018-03-06 08:59, Geert Uytterhoeven wrote:
Hi Rob, Jolly,
On Mon, Mar 5, 2018 at 11:39 PM, Rob Herring <robh@xxxxxxxxxx> wrote:
On Tue, Feb 27, 2018 at 03:55:49PM -0800, Jolly Shah wrote:
Add documentation to describe ZynqMP power domain bindings.
Signed-off-by: Jolly Shah <jollys@xxxxxxxxxx>
Signed-off-by: Rajan Vaja <rajanv@xxxxxxxxxx>
---
.../devicetree/bindings/power/zynqmp-genpd.txt | 46 ++++++++++++++++++++++
1 file changed, 46 insertions(+)
create mode 100644 Documentation/devicetree/bindings/power/zynqmp-genpd.txt
diff --git a/Documentation/devicetree/bindings/power/zynqmp-genpd.txt b/Documentation/devicetree/bindings/power/zynqmp-genpd.txt
new file mode 100644
index 0000000..25f9711
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/zynqmp-genpd.txt
+This node contains a number of subnodes, each representing a single PM domain
+that PM domain consumer devices reference.
+
+== PM Domain Nodes ==
+
+Required properties:
+ - #power-domain-cells: Number of cells in a PM domain specifier. Must be 0.
+ - pd-id: List of domain identifiers of as defined by platform firmware. These
+ identifiers are passed to the PM firmware.
+
+Example:
+ zynqmp-genpd {
+ compatible = "xlnx,zynqmp-genpd";
What's the control interface for controlling the domains?
+
+ pd_usb0: pd-usb0 {
+ pd-id = <22>;
+ #power-domain-cells = <0>;
There's no need for all these sub nodes. Make #power-domain-cells 1 and
put the id in the cell value.
That was my first reaction, too...
+ };
+
+ pd_sata: pd-sata {
+ pd-id = <28>;
+ #power-domain-cells = <0>;
+ };
+
+ pd_gpu: pd-gpu {
+ pd-id = <58 20 21>;
... until I saw the above.
Controlling the GPU power area requires controlling 3 physical areas?
However, doing it this way may bite you in the future, if a need arises to
control a subset. And what about power up/down order?
What about defining 3 separate domains and arranging them in parent-child
relationship? generic power domains already supports that and this allows
to nicely define the power on/off order.
+ #power-domain-cells = <0x0>;
+ };
+ };
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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