Hello,
I am trying to enable the SPI into the Dragonboard410c using the 283 image version without success.
Before opening this post I found the message
How to enable spi and access it in Debian os
(please note that in that thread the forum formatter changes code characters as " to the sequence ", also for characters ‘<’ & ‘>’)
and I further tried at least two attempts.
The first thing I done is to downloaded the 4.9.56 kernel as listed here.
1st attempt
I donwloaded the Peripherals Programming Guide Linux Android, with SPI section included.
This guide suggests to modify the following files:
kernel/arch/arm/boot/dts/qcom/msm8916.dtsi
adding the following content:
aliases{
spi0 = &spi_0; /* SPI0 controller device */
};
spi_0: spi@78b7000 { /* BLSP1 QUP3 */
compatible = "qcom,spi-qup-v2";
#address-cells = <1>;
#size-cells = <0>;
reg-names = "spi_physical", "spi_bam_physical";
reg = <0x78b7000 0x600>,
<0x7884000 0x23000>;
interrupt-names = "spi_irq", "spi_bam_irq";
interrupts = <0 97 0>, <0 238 0>;
spi-max-frequency = <50000000>;
pinctrl-names = "default", "sleep";
pinctrl-0 = <&spi0_default &spi0_cs0_active>;
pinctrl-1 = <&spi0_sleep &spi0_cs0_sleep>;
clocks = <&clock_gcc clk_gcc_blsp1_ahb_clk>,
<&clock_gcc clk_gcc_blsp1_qup3_spi_apps_clk>;
clock-names = "iface_clk", "core_clk";
qcom,infinite-mode = <0>;
qcom,use-bam;
qcom,use-pinctrl;
qcom,ver-reg-exists;
qcom,bam-consumer-pipe-index = <8>;
qcom,bam-producer-pipe-index = <9>;
qcom,master-id = <86>;
lattice,spi-usb@0 {
compatible = "lattice,ice40-spi-usb";
reg = <0>;
spi-max-frequency = <50000000>;
spi-cpol = <1>;
spi-cpha = <1>;
core-vcc-supply = <&pm8916_l2>;
spi-vcc-supply = <&pm8916_l5>;
qcom,pm-qos-latency = <2>;
lattice,reset-gpio = <&msm_gpio 3 0>;
lattice,config-done-gpio = <&msm_gpio 1 0>;
lattice,vcc-en-gpio = <&msm_gpio 114 0>;
lattice,clk-en-gpio = <&msm_gpio 0 0>;
clocks = <&clock_rpm clk_bb_clk2_pin>;
clock-names = "xo";
pinctrl-names = "default", "sleep";
pinctrl-0 = <&ice40_default>;
pinctrl-1 = <&ice40_sleep>;
};
};
Then modifying the file kernel/arch/arm/boot/dts/qcom/<chipset>-pinctrl.dtsi which for Linux 4.9.56 linaro kernel should be
kernel/arch/arm/boot/dts/qcom/msm8916-pins.dtsi
&soc {
tlmm_pinmux: pinctrl@1000000 {
//snip
spi0_active {
/* MOSI, MISO, CLK */
qcom,pins = <&gp 8>, <&gp 9>, <&gp 11>;
qcom,num-grp-pins = <3>;
qcom,pin-func = <1>;
label = "spi0-active";
/* active state */
spi0_default: default {
drive-strength = <12>; /* 12 MA */
bias-disable = <0>; /* No PULL */
};
};
spi0_suspend {
/* MOSI, MISO, CLK */
qcom,pins = <&gp 8>, <&gp 9>, <&gp 11>;
qcom,num-grp-pins = <3>;
qcom,pin-func = <0>;
label = "spi0-suspend";
/* suspended state */
spi0_sleep: sleep {
drive-strength = <2>; /* 2 MA */
bias-pull-down; /* pull down */
};
};
However, the kernel compilation fails because the content of the modifications seems wrong. In fact, in the second modificatioin seems to be missing at least one bracket, and this is not the only error the kernel claims.
2nd attempt
Always referring to the post [How to enable spi and access it in Debian os Message 47 ]How to enable spi and access it in Debian os - #47 by ljking)
two modifications are suggested, one for device-tree and the other for kernel driver.
However, after successfully compiling the kernel, creating the img file file with mkbootimg and loading it using fastboot, the kernel does not recognize any more the Wifi IC.
So do you have any OFFICIAL patch available rather than an unofficial old thread ?
Could you please provide reliable instructions to enable the SPI ?
Thank you in advance,
Regards,
Simon
) .