[PATCH] arm: dts: am335x-pocketbeagle: add gpio-line-names

Drew Fustini
2020-06-09T14:25:13Z

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 <jason@beagleboard.org>
Reviewed-by: Robert Nelson <robertcnelson@gmail.com>
Signed-off-by: Drew Fustini <drew@beagleboard.org>
---
arch/arm/boot/dts/am335x-pocketbeagle.dts | 144 ++++++++++++++++++++++
1 file changed, 144 insertions(+)

diff --git a/arch/arm/boot/dts/am335x-pocketbeagle.dts b/arch/arm/boot/dts/am335x-pocketbeagle.dts
index 4da719098028..60e5fa2b9156 100644
--- a/arch/arm/boot/dts/am335x-pocketbeagle.dts
+++ b/arch/arm/boot/dts/am335x-pocketbeagle.dts
@@ -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 = <
--
2.25.1