Hi,
through my work I have suddenly to deal with the device tree, it‘s my
first time. The platform I am dealing with is a Xilinx UltraScale+ with
Petalinux.
In the FPGA a video chain is set up. It contains different IP-Cores but
not all IP-Cores are from Xilinx we also use custom ones.
Yesterday I wanted to compile the Petalinux, but got an error that a
label (port connection, found in pl.dtsi) was not found in the device
tree. This is because it was the connection from a Xilinx IP-Core to a
custom one (video_cropper), which could not be recognized. I fixed the
error by adding in and out ports to the node of the custom IP-Core ->
snipped from system-user.dtsi
&sdi_rx_input_SDI_IN_2_video_cropper_0 {
video_cropper_2_port0: ports {
port@0 {
compatible = "rme,mkfcrop";
rme,width = <1920>;
rme,height = <1080>;
rme,hor-offset = <0>;
rme,vert-offset = <0>;
direction = "input";
reg = <0>;
sdi_rx_input_SDI_IN_2_video_cropper_0sdi_rx_input_SDI_IN_2_v_smpte_uhdsdi_rx_ss: endpoint {
remote-endpoint =
<&sdirx_outsdi_rx_input_SDI_IN_2_v_smpte_uhdsdi_rx_ss>;
};
};
port@1 {
compatible = "rme,mkfcrop";
rme,width = <1920>;
rme,height = <1080>;
rme,hor-offset = <0>;
rme,vert-offset = <0>;
direction = "output";
reg = <1>;
video_cropper_2_out: endpoint {
remote-endpoint = <&sdi_rx_input_SDI_IN_2_v_proc_ss_0>;
};
};
};
};
The compilation went without errors but WHY? The output port
"remote-endpoint = <&sdi_rx_input_SDI_IN_2_v_proc_ss_0>;" points to the
label of the node found in the pl.dtsi, but not to the input port of
this node (it has no input port label) -> snipped from pl.dtsi
sdi_rx_input_SDI_IN_2_v_proc_ss_0: v_proc_ss@a0240000 {
clock-names = "aclk_axis", "aclk_ctrl";
clocks = <&zynqmp_clk 72>, <&zynqmp_clk 71>;
compatible = "xlnx,v-proc-ss-2.3",
"xlnx,vpss-scaler-2.2", "xlnx,v-vpss-scaler-2.2", "xlnx,vpss-scaler";
reg = <0x0 0xa0240000 0x0 0x40000>;
reset-gpios = <&gpio_resets_axi_gpio_resets 5 0 1>;
xlnx,colorspace-support = <0>;
xlnx,csc-enable-window = "true";
xlnx,enable-csc = "false";
xlnx,h-scaler-phases = <64>;
xlnx,h-scaler-taps = <6>;
xlnx,max-height = <1125>;
xlnx,max-num-phases = <64>;
xlnx,max-width = <2200>;
xlnx,num-hori-taps = <6>;
xlnx,num-vert-taps = <6>;
xlnx,pix-per-clk = <2>;
xlnx,samples-per-clk = <2>;
xlnx,scaler-algorithm = <2>;
xlnx,topology = <0>;
xlnx,use-uram = <0>;
xlnx,v-scaler-phases = <64>;
xlnx,v-scaler-taps = <6>;
xlnx,video-width = <10>;
scaler_portssdi_rx_input_SDI_IN_2_v_proc_ss_0:
ports {
#address-cells = <1>;
#size-cells = <0>;
scaler_port1sdi_rx_input_SDI_IN_2_v_proc_ss_0: port@1 {
/* For xlnx,video-format user
needs to fill as per their requirement */
reg = <1>;
xlnx,video-format = <3>;
xlnx,video-width = <10>;
sca_outsdi_rx_input_SDI_IN_2_v_proc_ss_0: endpoint {
remote-endpoint =
<&sdi_rx_input_SDI_IN_2_v_frmbuf_wr_0sdi_rx_input_SDI_IN_2_v_proc_ss_0>;
};
};
scaler_port0sdi_rx_input_SDI_IN_2_v_proc_ss_0: port@0 {
/* For xlnx,video-format user
needs to fill as per their requirement */
reg = <0>;
xlnx,video-format = <3>;
xlnx,video-width = <10>;
};
};
};
Sorry for the bad formatting of the snippets.
kind regards,
Patrice
