The DAC found on the last chip select requires a word length of 12 bits,
which is not supported by the SSP controller of the iMX28. Use
bitbanging for that bus to support such a length.
Signed-off-by: Maxime Ripard <maxime.rip...@free-electrons.com>
---
arch/arm/boot/dts/imx28-cfa10049.dts | 78 ++++++++++++++++++----------------
1 file changed, 42 insertions(+), 36 deletions(-)
diff --git a/arch/arm/boot/dts/imx28-cfa10049.dts
b/arch/arm/boot/dts/imx28-cfa10049.dts
index 7890acc..dd91244 100644
--- a/arch/arm/boot/dts/imx28-cfa10049.dts
+++ b/arch/arm/boot/dts/imx28-cfa10049.dts
@@ -52,48 +52,17 @@
spi3_pins_cfa10049: spi3-cfa10049@0 {
reg = <0>;
fsl,pinmux-ids = <
- 0x0181 /*
MX28_PAD_GPMI_RDN__SSP3_SCK */
- 0x01c1 /*
MX28_PAD_GPMI_RESETN__SSP3_CMD */
- 0x0111 /*
MX28_PAD_GPMI_CE1N__SSP3_D3 */
- 0x01a2 /*
MX28_PAD_GPMI_ALE__SSP3_D4 */
- 0x01b2 /*
MX28_PAD_GPMI_CLE__SSP3_D5 */
+ 0x0183 /*
MX28_PAD_GPMI_RDN__GPIO_0_24 */
+ 0x01c3 /*
MX28_PAD_GPMI_RESETN__GPIO_0_28 */
+ 0x0113 /*
MX28_PAD_GPMI_CE1N__GPIO_0_17 */
+ 0x01a3 /*
MX28_PAD_GPMI_ALE__GPIO_0_26 */
+ 0x01b3 /*
MX28_PAD_GPMI_CLE__GPIO_0_27 */
>;
fsl,drive-strength = <1>;
fsl,voltage = <1>;
fsl,pull-up = <1>;
};
};
-
- ssp3: ssp@80016000 {
- compatible = "fsl,imx28-spi";
- pinctrl-names = "default";
- pinctrl-0 = <&spi3_pins_cfa10049>;
- status = "okay";
-
- gpio5: gpio5@0 {
- compatible = "fairchild,74hc595";
- gpio-controller;
- #gpio-cells = <2>;
- reg = <0>;
- registers-number = <2>;
- spi-max-frequency = <100000>;
- };
-
- gpio6: gpio6@1 {
- compatible = "fairchild,74hc595";
- gpio-controller;
- #gpio-cells = <2>;
- reg = <1>;
- registers-number = <4>;
- spi-max-frequency = <100000>;
- };
-
- dac0: dh2228@2 {
- compatible = "rohm,dh2228fv";
- reg = <2>;
- spi-max-frequency = <100000>;
- };
- };
};
apbx@80040000 {
@@ -177,4 +146,41 @@
status = "okay";
};
};
+
+ spi3 {
+ compatible = "spi-gpio";
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi3_pins_cfa10049>;
+ status = "okay";
+ gpio-sck = <&gpio0 24 0>;
+ gpio-mosi = <&gpio0 28 0>;
+ cs-gpios = <&gpio0 17 0 &gpio0 26 0 &gpio0 27 0>;
+ num-chipselects = <3>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ gpio5: gpio5@0 {
+ compatible = "fairchild,74hc595";
+ gpio-controller;
+ #gpio-cells = <2>;
+ reg = <0>;
+ registers-number = <2>;
+ spi-max-frequency = <100000>;
+ };
+
+ gpio6: gpio6@1 {
+ compatible = "fairchild,74hc595";
+ gpio-controller;
+ #gpio-cells = <2>;
+ reg = <1>;
+ registers-number = <4>;
+ spi-max-frequency = <100000>;
+ };
+
+ dac0: dh2228@2 {
+ compatible = "rohm,dh2228fv";
+ reg = <2>;
+ spi-max-frequency = <100000>;
+ };
+ };
};
--
1.7.10.4
--
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