Hi,
I managed to get the SPI devices /dev/spidev0.0 and /dev/spidev0.1 to be
visible using the mainline kernel 4.4.11 on my BananaPi R1 (Allwinner A20)
with the attached patch to spidev.c and the dts. But the SPI device is not
working. When I send some data for example with *echo "test" >
/dev/spidev0.0 *I could see some activity on *both* chip select lines
SPI_CS0 and SPI_CS1, but no reaction on SPI0_CLK. Is this a bug somewhere
or is there additional tweaking in the dts required?
A testprogramm driving a small display via SPI works fine with the old
sunxi kernel.
Uli
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diff --git a/arch/arm/boot/dts/sun7i-a20-bananapi.dts b/arch/arm/boot/dts/sun7i-a20-bananapi.dts
index 67c8a76..1efa46e 100755
--- a/arch/arm/boot/dts/sun7i-a20-bananapi.dts
+++ b/arch/arm/boot/dts/sun7i-a20-bananapi.dts
@@ -58,6 +58,9 @@
serial0 = &uart0;
serial1 = &uart3;
serial2 = &uart7;
+ spi0 = &spi0;
+ spi1 = &spi1;
+ spi2 = &spi2;
};
chosen {
@@ -252,6 +255,17 @@
<&spi0_cs0_pins_a>,
<&spi0_cs1_pins_a>;
status = "okay";
+ clock-frequency = <1000000>;
+ spidev@0x00 {
+ compatible = "allwinner,sun4i-a10-sp";
+ spi-max-frequency = <100000000>;
+ reg = <0>;
+ };
+ spidev@0x01 {
+ compatible = "allwinner,sun4i-a10-sp";
+ spi-max-frequency = <100000000>;
+ reg = <1>;
+ };
};
&uart0 {
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index d0e7dfc..80e21e0 100755
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -695,6 +695,7 @@ static struct class *spidev_class;
static const struct of_device_id spidev_dt_ids[] = {
{ .compatible = "rohm,dh2228fv" },
{ .compatible = "lineartechnology,ltc2488" },
+ { .compatible = "allwinner,sun4i-a10-sp" },
{},
};
MODULE_DEVICE_TABLE(of, spidev_dt_ids);
