Hi,
El 23/03/15 a las 11:19, Michal Suchanek escibió:
Hello,
I tried to load the spidev driver with the 3.4 kernel and it did .. nothing.
So I upgraded to linux 4.0rc4 and tried to convince it to boot on the
a10s olinuxino.
Problems
(...)
5) did not manage to get SPI working. I patched the DT with some
random values but the driver complains that there is unsupported
function
https://github.com/hramrach/linux-sunxi/commit/fba83a07ce3261b77f5cd3fac43f78adee4b33dd
The pins you're using, PB14-PB17, don't make sense - they're not SPI
pins. Are you sure you didn't mean PB11-PB14 (CS0/CLK/MISO/MOSI,
respectively)? Have a look at the User Manual as a reference:
http://dl.linux-sunxi.org/A10s/A10s%20User%20Manual%20V1.30.pdf
6) I have no idea how to bind spidev (in DT?) even if spi worked
You need to declare your device, like with a properly supported device,
except your device's driver will be a spidev. See below for an example
patch from when I tested DMA on A10S
---
arch/arm/boot/dts/sun5i-a10s-olinuxino-micro.dts | 12 ++++++++++++
arch/arm/boot/dts/sun5i-a10s.dtsi | 7 +++++++
2 files changed, 19 insertions(+)
diff --git a/arch/arm/boot/dts/sun5i-a10s-olinuxino-micro.dts
b/arch/arm/boot/dts/sun5i-a10s-olinuxino-micro.dts
index ea9519d..3f19e57 100644
--- a/arch/arm/boot/dts/sun5i-a10s-olinuxino-micro.dts
+++ b/arch/arm/boot/dts/sun5i-a10s-olinuxino-micro.dts
@@ -68,6 +68,18 @@
status = "okay";
};
+ spi2: spi@01c17000 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&spi2_pins_a>;
+ status = "okay";
+
+ dac0: dh2228@2 {
+ compatible = "rohm,dh2228fv";
+ reg = <2>;
+ spi-max-frequency = <100000>;
+ };
+ };
+
pinctrl@01c20800 {
mmc0_cd_pin_olinuxino_micro: mmc0_cd_pin@0 {
allwinner,pins = "PG1";
diff --git a/arch/arm/boot/dts/sun5i-a10s.dtsi
b/arch/arm/boot/dts/sun5i-a10s.dtsi
index 2ee786a..1404a55 100644
--- a/arch/arm/boot/dts/sun5i-a10s.dtsi
+++ b/arch/arm/boot/dts/sun5i-a10s.dtsi
@@ -506,6 +506,13 @@
allwinner,drive = <2>;
allwinner,pull = <0>;
};
+
+ spi2_pins_a: spi2@0 {
+ allwinner,pins = "PB11", "PB12", "PB13", "PB14";
+ allwinner,function = "spi2";
+ allwinner,drive = <0>;
+ allwinner,pull = <0>;
+ };
};
timer@01c20c00 {
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