ARM: dts: imx6qdl-apalis: Pass 'io-channel-cells' to the ADC

The STMPE811 ADC on the Apalis SoM board can be used as a provider
of ADC capabilities to other devices, for example, when a custom
baseboard has an SN74LV4051 analog mux.

Pass the 'io-channel-cells' parameter to indicate such possibility.

While at it, also pass a label for the adc device, so that it can
be referenced in the custom baseboard.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx6qdl-apalis.dtsi b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
index 7c6d9c7..4092af5 100644 (file)
--- a/arch/arm/boot/dts/imx6qdl-apalis.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-apalis.dtsi
@@ -330,10 +330,11 @@
                        st,touch-det-delay = <5>;
                };
 
-               stmpe-adc {
+               stmpe_adc: stmpe-adc {
                        compatible = "st,stmpe-adc";
                        /* forbid to use ADC channels 3-0 (touch) */
                        st,norequest-mask = <0x0F>;
+                       #io-channel-cells = <1>;
                };
        };
 };