FAQ_MA35D1_Add GPIO-Line-Name

[yhcheng3]

Question :

Add GPIO-Line-Name


Answer.


Assuming that GPIO0~GPIO7 are named "test0...test7" respectively, they need to be configured in ma35d1.dtsi. The relevant configuration is as follows:

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gpioa: gpioa@40040000 {
                        reg = <0x0 0x40040000 0 0x40>,
                              <0x0 0x40040800 0 0x40>;
                        interrupts = <GIC_SPI  14 IRQ_TYPE_LEVEL_HIGH>;
                        clocks = <&clk GPA_GATE>;
                        gpio-controller;
                        #gpio-cells = <2>;
                        interrupt-controller;
                        #interrupt-cells = <2>;
                        gpio-line-names =
                              "test0", 
                              "test1", 
                              "test2",
                              "test3",
                              "test4",
                              "test5", 
                              "test6",
                              "test7","","","","","","","","";
                };

After compiling, use the tool gpioinfo to query GPIO information as follows:

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# ./gpioinfo

gpiochip0 - 16 lines:
line 0: "test0" unused input active-high
line 1: "test1" unused input active-high
line 2: "test2" unused input active-high
line 3: "test3" unused input active-high
line 4: "test4" unused input active-high
line 5: "test5" unused input active-high
line 6: "test6" unused input active-high
line 7: "test7" unused input active-high
line 8: unnamed unused input active-high
line 9: unnamed unused input active-high
line 10: unnamed unused input active-high
line 11: unnamed unused input active-high
line 12: unnamed unused input active-high
line 13: unnamed unused input active-high
line 14: unnamed unused input active-high
line 15: unnamed unused input active-high
......


The first column is the GPIO number, and the second column is line-name, which is configured in dts by configuring gpio-line-names.
The third column is the name of the user, the fourth column is the direction, and the last column is the activation status.

Test Command:

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# ./gpiofind test0

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# ./gpioget gpiochip0 0

#MA35D1, #GPIO
.