On 05/01/17 01:17, Chen-Yu Tsai wrote:

Hi Quentin,

On Wed, Jan 4, 2017 at 9:14 PM, Rob Herring [off-list ref] wrote:

quoted

On Mon, Jan 02, 2017 at 05:37:07PM +0100, Quentin Schulz wrote:

quoted

The X-Powers AXP20X and AXP22X PMICs have an AC entry to supply power to
the board. They have a few registers dedicated to the status of the AC
power supply.

This adds the DT binding documentation for the AC power supply for
AXP20X and AXP22X PMICs.

Signed-off-by: Quentin Schulz <redacted>
---
 .../bindings/power/supply/axp20x_ac_power.txt      | 28 ++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt

diff --git a/Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt b/Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt
new file mode 100644
index 0000000..16d0de4
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/supply/axp20x_ac_power.txt

@@ -0,0 +1,28 @@
+AXP20X and AXP22X PMICs' AC power supply
+
+Required Properties:
+ - compatible: One of:
+                     "x-powers,axp202-ac-power-supply"
+                     "x-powers,axp221-ac-power-supply"
+
+More Required Properties for AXP20X PMICs:
+ - io-channels: phandles to ACIN voltage and current ADC channels
+ - io-channel-names = "acin_v", "acin_i";
+
+This node is a subnode of the axp20x PMIC.
+
+The AXP20X can read the current current and voltage supplied by AC by
+reading ADC channels from the AXP20X ADC.
+
+The AXP22X is only able to tell if an AC power supply is present and
+usable.
+
+Example:
+
+&axp209 {
+     ac_power_supply: ac_power_supply {

power-supply {

quoted

+             compatible = "x-powers,axp202-ac-power-supply";
+             io-channels = <&axp209_adc 0>, <&axp209_adc 1>;

Is this assignment fixed? If so, then it doesn't need to be in DT.

Is there any case that we actually need to use the IIO channels
from the device tree? Seems to me its limited to the other AXP
sub-devices.

If so you could use struct iio_map to map the channels to other
devices by name. See axp288_adc for an example.

Agreed. When we are within a device (so it's not flexible) that
is the way to go.

Regards
ChenYu

quoted

quoted

+             io-channel-names = "acin_v", "acin_i";
+     };
+};
--
2.9.3

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