arm: dts: am335x-pocketbeagle: add gpio-line-names

The BeagleBoard.org PocketBeagle has P1 and P2 headers [0] which expose many of the TI AM3358 SoC balls to stacking expansion boards called "capes", or to other external connections like jumper wires connected to a breadboard.

Note: the AM3358 die is actually embedded inside of the OSD335x-SM System-in-Package (SiP) [1] but that is irrelevant to the gpio driver.

Many of the P1 and P2 header pins can muxed to a GPIO line. The gpio-line-names describe which P1 or P2 pin that line goes to and the default mux for that P1 or P2 pin if it is not GPIO.

Some GPIO lines are named "[NC]" as the corresponding balls are not routed to anything on the PCB.

The goal for these names is to make it easier for a user viewing the output of gpioinfo to determine which P1 or P2 pin is connected to a GPIO line. The output of gpioinfo on a PocketBeagle would be:

gpiochip0 - 32 lines:

	line   0:       "[NC]"       unused   input  active-high 
	line   1:       "[NC]"       unused   input  active-high 
	line   2: "P1.08 [SPI0_CLK]" unused input active-high 
	line   3: "P1.10 [SPI0_MISO]" unused input active-high 
	line   4: "P1.12 [SPI0_MOSI]" unused input active-high 
	line   5: "P1.06 [SPI0_CS]" unused input active-high 
	line   6:  "[MMC0_CD]"         "cd"   input   active-low [used]
	line   7: "P2.29 [SPI1_CLK]" unused input active-high 
	line   8:       "[NC]"       unused   input  active-high 
	line   9:       "[NC]"       unused   input  active-high 
	line  10:       "[NC]"       unused   input  active-high 
	line  11:       "[NC]"       unused   input  active-high 
	line  12: "P1.26 [I2C2_SDA]" unused input active-high 
	line  13: "P1.28 [I2C2_SCL]" unused input active-high 
	line  14: "P2.11 [I2C1_SDA]" unused input active-high 
	line  15: "P2.09 [I2C1_SCL]" unused input active-high 
	line  16:       "[NC]"       unused   input  active-high 
	line  17:       "[NC]"       unused   input  active-high 
	line  18:       "[NC]"       unused   input  active-high 
	line  19: "P2.31 [SPI1_CS]" unused input active-high 
	line  20: "P1.20 [PRU0.16]" unused input active-high 
	line  21:       "[NC]"       unused   input  active-high 
	line  22:       "[NC]"       unused   input  active-high 
	line  23:      "P2.03"       unused   input  active-high 
	line  24:       "[NC]"       unused   input  active-high 
	line  25:       "[NC]"       unused   input  active-high 
	line  26:      "P1.34"       unused   input  active-high 
	line  27:      "P2.19"       unused   input  active-high 
	line  28:       "[NC]"       unused   input  active-high 
	line  29:       "[NC]"       unused   input  active-high 
	line  30: "P2.05 [UART4_RX]" unused input active-high 
	line  31: "P2.07 [UART4_TX]" unused input active-high 
gpiochip1 - 32 lines:
	line   0:       "[NC]"       unused   input  active-high 
	line   1:       "[NC]"       unused   input  active-high 
	line   2:       "[NC]"       unused   input  active-high 
	line   3:       "[NC]"       unused   input  active-high 
	line   4:       "[NC]"       unused   input  active-high 
	line   5:       "[NC]"       unused   input  active-high 
	line   6: "P1.06 [SPI0_CS]" unused input active-high 
	line   7: "P1.06 [SPI0_CS]" unused input active-high 
	line   8: "P2.27 [SPI1_MISO]" unused input active-high 
	line   9: "P2.25 [SPI1_MOSI]" unused input active-high 
	line  10: "P1.32 [UART0_RX]" unused input active-high 
	line  11: "P1.30 [UART0_TX]" unused input active-high 
	line  12:      "P2.24"       unused   input  active-high 
	line  13:      "P2.33"       unused   input  active-high 
	line  14:      "P2.22"       unused   input  active-high 
	line  15:      "P2.18"       unused   input  active-high 
	line  16:       "[NC]"       unused   input  active-high 
	line  17:       "[NC]"       unused   input  active-high 
	line  18: "P2.01 [PWM1A]" unused input active-high 
	line  19:       "[NC]"       unused   input  active-high 
	line  20:      "P2.10"       unused   input  active-high 
	line  21: "[user led 0]" "beaglebone:green:usr0" output active-high [used]
	line  22: "[user led 1]" "beaglebone:green:usr1" output active-high [used]
	line  23: "[user led 2]" "beaglebone:green:usr2" output active-high [used]
	line  24: "[user led 3]" "beaglebone:green:usr3" output active-high [used]
	line  25:      "P2.06"       unused   input  active-high 
	line  26:      "P2.04"       unused   input  active-high 
	line  27:      "P2.02"       unused   input  active-high 
	line  28:      "P2.08"       unused   input  active-high 
	line  29:       "[NC]"       unused   input  active-high 
	line  30:       "[NC]"       unused   input  active-high 
	line  31:       "[NC]"       unused   input  active-high 
gpiochip2 - 32 lines:
	line   0:       "[NC]"       unused   input  active-high 
	line   1:      "P2.17"       unused   input  active-high 
	line   2:       "[NC]"       unused   input  active-high 
	line   3:       "[NC]"       unused   input  active-high 
	line   4:       "[NC]"       unused   input  active-high 
	line   5: "[EEPROM_WP]" unused input active-high 
	line   6:       "[NC]"       unused   input  active-high 
	line   7:       "[NC]"       unused   input  active-high 
	line   8:       "[NC]"       unused   input  active-high 
	line   9:       "[NC]"       unused   input  active-high 
	line  10:       "[NC]"       unused   input  active-high 
	line  11:       "[NC]"       unused   input  active-high 
	line  12:       "[NC]"       unused   input  active-high 
	line  13:       "[NC]"       unused   input  active-high 
	line  14:       "[NC]"       unused   input  active-high 
	line  15:       "[NC]"       unused   input  active-high 
	line  16:       "[NC]"       unused   input  active-high 
	line  17:       "[NC]"       unused   input  active-high 
	line  18:       "[NC]"       unused   input  active-high 
	line  19:       "[NC]"       unused   input  active-high 
	line  20:       "[NC]"       unused   input  active-high 
	line  21:       "[NC]"       unused   input  active-high 
	line  22: "P2.35 [AIN5]" unused input active-high 
	line  23: "P1.02 [AIN6]" unused input active-high 
	line  24: "P1.35 [PRU1.10]" unused input active-high 
	line  25: "P1.04 [PRU1.11]" unused input active-high 
	line  26: "[MMC0_DAT3]" unused input active-high 
	line  27: "[MMC0_DAT2]" unused input active-high 
	line  28: "[MMC0_DAT1]" unused input active-high 
	line  29: "[MMC0_DAT0]" unused input active-high 
	line  30: "[MMC0_CLK]"       unused   input  active-high 
	line  31: "[MMC0_CMD]"       unused   input  active-high 
gpiochip3 - 32 lines:
	line   0:       "[NC]"       unused   input  active-high 
	line   1:       "[NC]"       unused   input  active-high 
	line   2:       "[NC]"       unused   input  active-high 
	line   3:       "[NC]"       unused   input  active-high 
	line   4:       "[NC]"       unused   input  active-high 
	line   5: "[I2C0_SDA]"       unused   input  active-high 
	line   6: "[I2C0_SCL]"       unused   input  active-high 
	line   7:     "[JTAG]"       unused   input  active-high 
	line   8:     "[JTAG]"       unused   input  active-high 
	line   9:       "[NC]"       unused   input  active-high 
	line  10:       "[NC]"       unused   input  active-high 
	line  11:       "[NC]"       unused   input  active-high 
	line  12:       "[NC]"       unused   input  active-high 
	line  13: "P1.03 [USB1]" unused input active-high 
	line  14: "P1.36 [PWM0A]" unused input active-high 
	line  15: "P1.33 [PRU0.1]" unused input active-high 
	line  16: "P2.32 [PRU0.2]" unused input active-high 
	line  17: "P2.30 [PRU0.3]" unused input active-high 
	line  18: "P1.31 [PRU0.4]" unused input active-high 
	line  19: "P2.34 [PRU0.5]" unused input active-high 
	line  20: "P2.28 [PRU0.6]" unused input active-high 
	line  21: "P1.29 [PRU0.7]" unused input active-high 
	line  22:       "[NC]"       unused   input  active-high 
	line  23:       "[NC]"       unused   input  active-high 
	line  24:       "[NC]"       unused   input  active-high 
	line  25:       "[NC]"       unused   input  active-high 
	line  26:       "[NC]"       unused   input  active-high 
	line  27:       "[NC]"       unused   input  active-high 
	line  28:       "[NC]"       unused   input  active-high 
	line  29:       "[NC]"       unused   input  active-high 
	line  30:       "[NC]"       unused   input  active-high 
	line  31:       "[NC]"       unused   input  active-high 

[0] https://github.com/beagleboard/pocketbeagle/wiki/System-Reference-Manual#71_Expansion_Header_Connectors
[1] https://octavosystems.com/app_notes/osd335x-family-pin-assignments/

Reviewed-by Jason Kridner <[email protected]>

Reviewed-by Robert Nelson <[email protected]>

Signed-off-by Drew Fustini <[email protected]>

---
 arch/arm/boot/dts/am335x-pocketbeagle.dts | 144 ++++++++++++++++++++++
 1 file changed, 144 insertions(+)

arch/arm/boot/dts/am335x-pocketbeagle.dts +144 -0

index 4da719098028..60e5fa2b9156 100644
@@ -59,6 +59,150 @@ vmmcsd_fixed: fixedregulator0 {
 	};
 };
 
+&gpio0 {
+	gpio-line-names =
+		"[NC]",
+		"[NC]",
+		"P1.08 [SPI0_CLK]",
+		"P1.10 [SPI0_MISO]",
+		"P1.12 [SPI0_MOSI]",
+		"P1.06 [SPI0_CS]",
+		"[MMC0_CD]",
+		"P2.29 [SPI1_CLK]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"P1.26 [I2C2_SDA]",
+		"P1.28 [I2C2_SCL]",
+		"P2.11 [I2C1_SDA]",
+		"P2.09 [I2C1_SCL]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"P2.31 [SPI1_CS]",
+		"P1.20 [PRU0.16]",
+		"[NC]",
+		"[NC]",
+		"P2.03",
+		"[NC]",
+		"[NC]",
+		"P1.34",
+		"P2.19",
+		"[NC]",
+		"[NC]",
+		"P2.05 [UART4_RX]",
+		"P2.07 [UART4_TX]";
+};
+
+&gpio1 {
+	gpio-line-names =
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"P1.06 [SPI0_CS]",
+		"P1.06 [SPI0_CS]",
+		"P2.27 [SPI1_MISO]",
+		"P2.25 [SPI1_MOSI]",
+		"P1.32 [UART0_RX]",
+		"P1.30 [UART0_TX]",
+		"P2.24",
+		"P2.33",
+		"P2.22",
+		"P2.18",
+		"[NC]",
+		"[NC]",
+		"P2.01 [PWM1A]",
+		"[NC]",
+		"P2.10",
+		"[user led 0]",
+		"[user led 1]",
+		"[user led 2]",
+		"[user led 3]",
+		"P2.06",
+		"P2.04",
+		"P2.02",
+		"P2.08",
+		"[NC]",
+		"[NC]",
+		"[NC]";
+};
+
+&gpio2 {
+	gpio-line-names =
+		"[NC]",
+		"P2.17",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[EEPROM_WP]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"P2.35 [AIN5]",
+		"P1.02 [AIN6]",
+		"P1.35 [PRU1.10]",
+		"P1.04 [PRU1.11]",
+		"[MMC0_DAT3]",
+		"[MMC0_DAT2]",
+		"[MMC0_DAT1]",
+		"[MMC0_DAT0]",
+		"[MMC0_CLK]",
+		"[MMC0_CMD]";
+};
+
+&gpio3 {
+	gpio-line-names =
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[I2C0_SDA]",
+		"[I2C0_SCL]",
+		"[JTAG]",
+		"[JTAG]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"P1.03 [USB1]",
+		"P1.36 [PWM0A]",
+		"P1.33 [PRU0.1]",
+		"P2.32 [PRU0.2]",
+		"P2.30 [PRU0.3]",
+		"P1.31 [PRU0.4]",
+		"P2.34 [PRU0.5]",
+		"P2.28 [PRU0.6]",
+		"P1.29 [PRU0.7]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]",
+		"[NC]";
+};
+
 &am33xx_pinmux {
 	i2c2_pins: pinmux-i2c2-pins {
 		pinctrl-single,pins = <

Signature · 1 line

2.25.1

Tony - does this look ok for 5.9?

If so, I might start making other variants like BeagleBone Blue and BeagleBone {Green,Black} Wireless and submit those when ready.

Quoted 1 line · Drew Fustini

Tony - does this look ok for 5.9?

Yes looks OK to me.

Just wondering, are the line with "NA" not used internally either? If the "NA" lines are used internally, we should probably use "Reserved" or "Internal" or something like that to avoid later on having to patch them with internal device names..

Quoted 3 lines

If so, I might start making other variants like BeagleBone Blue and BeagleBone {Green,Black} Wireless and submit those when ready.

OK yeah makes sense.