From: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
Change the device tree to use cs-gpios for the spi bus master
and standard gpio operation instead of relying on the HW with
just 2 chip_selects using ALT0.
This reassigns the existing CS pins 7(=CS1) and 8(=CS0)
as output instead of ALT0 (=SPI HW block controlled)
and adds them in the list of cs-gpios for the spi-bus.
Signed-off-by: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
---
arch/arm/boot/dts/bcm2835-rpi.dtsi | 4 ++--
arch/arm/boot/dts/bcm2835.dtsi | 1 +
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index c706448..f0e36ab 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -20,12 +20,12 @@
pinctrl-names = "default";
gpioout: gpioout {
- brcm,pins = <6>;
+ brcm,pins = <6 7 8>;
brcm,function = <1>; /* GPIO out */
};
alt0: alt0 {
- brcm,pins = <0 1 2 3 4 5 7 8 9 10 11 14 15 40 45>;
+ brcm,pins = <0 1 2 3 4 5 9 10 11 14 15 40 45>;
brcm,function = <4>; /* alt0 */
};
diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 3342cb1..74d08e1 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -110,6 +110,7 @@
#address-cells = <1>;
#size-cells = <0>;
status = "disabled";
+ cs-gpios = <&gpio 8 0>, <&gpio 7 0>;
};
i2c0: i2c@20205000 {
--
1.7.10.4
--
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