Hello,
I'm creating the DT for a custom platform based on Freescale MX28 CPU and I have some
doubts about where to add some pin mux configurations: whether in imx28.dtsi or in my
platform dts.
A pair of examples folow:
Example #1. My platform is using a valid IOMUX for DUART TX/RX lines which is not
covered in imx28.dtsi, namely the I2C0 pins. Since this is a valid IOMUX that can be
used by other platforms, I'd say I should included it in imx28.dtsi:
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 3fa6d19..8928b7b 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -186,6 +186,17 @@
fsl,pull-up = <0>;
};
+ duart_pins_c: duart@2 {
+ reg = <2>;
+ fsl,pinmux-ids = <
+ 0x3182 /*
MX28_PAD_I2C0_SCL__DUART_RX */
+ 0x3192 /*
MX28_PAD_I2C0_SDA__DUART_TX */
+ >;
+ fsl,drive-strength = <0>;
+ fsl,voltage = <1>;
+ fsl,pull-up = <0>;
+ };
+
duart_4pins_a: duart-4pins@0 {
reg = <0>;
fsl,pinmux-ids = <
Example #2. My platform assembles a NAND chip which is powered at 1.8V. The imx28.dtsi
has a configuration 'gpmi_pins_a: gpmi-nand@0' that configures the pins at 3.3V.
Should I create another entry here 'gpmi_pins_b: gpmi-nand@1' with fsl,voltage = <0>;
or should I create a specific entry in my platform's DT instead?
What is the convention?
--
Héctor Palacios
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