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« Last post by vinczo on August 06, 2018, 07:40:55 PM »
Hi,
I already have two spi devices used (m25p80@0 and mac@1) and I'm trying to add two more spi devices (mac@2 and mac@3) to the dts.
So I modified the code as follows :
palmbus@10000000 {
spi@b00 {
// I comment these two lines
//pinctrl-names = "default";
//pinctrl-0 = <&spi_pins &spi_cs1>;
// I specify the GPIO used as CS for the four devices
// two of them belong to the spi group and the two others to the jtag group
#address-cells = <2>;
#size-cells = <0>;
cs-gpios = <&gpio0 3 1>, <&gpio1 5 1>, <&gpio0 19 1>, <&gpio0 21 1>;
status = "okay";
m25p80@0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "s25fl064k";
reg = <0 0>;
linux,modalias = "m25p80", "s25fl064k";
spi-max-frequency = <10000000>;
partition@0 {
label = "u-boot";
reg = <0x0 0x30000>;
read-only;
};
partition@30000 {
label = "u-boot-env";
reg = <0x30000 0x10000>;
read-only;
};
factory: partition@40000 {
label = "factory";
reg = <0x40000 0x10000>;
read-only;
};
partition@50000 {
label = "firmware";
reg = <0x50000 0x7b0000>;
};
};
mac@1 {
status = "okay";
compatible = "at25";
spi-max-frequency = <1000000>;
reg = <1>;
at25,byte-len = <0x100>;
at25,addr-mode = <1>;
at25,page-size = <16>;
};
mac@2 {
status = "okay";
compatible = "at25";
spi-max-frequency = <1000000>;
reg = <2>;
at25,byte-len = <0x100>;
at25,addr-mode = <1>;
at25,page-size = <16>;
};
mac@3 {
status = "okay";
compatible = "at25";
spi-max-frequency = <1000000>;
reg = <3>;
at25,byte-len = <0x100>;
at25,addr-mode = <1>;
at25,page-size = <16>;
};
};
[...];
};
I can see all four spi devices declared :
root@OpenWrt:~# ls /sys/bus/spi/devices/spi32766.
spi32766.0/ spi32766.1/ spi32766.2/ spi32766.3/
However, only the spi devices with CS from the spi group have data. The two others from the jtag group have no data to be read.
Does anyone have an idea, an advice ?
That would be much appreciated.
If impossible through dts, how can I do that ? spidev ? How ?
Thank you.
Vince
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