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Date: Tue, 12 May 2020 06:52:01 -0700
From: Tony Lindgren <tony@...mide.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Grygorii Strashko <grygorii.strashko@...com>,
Benoît Cousson <bcousson@...libre.com>,
Rob Herring <robh+dt@...nel.org>, linux-omap@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Jason Kridner <jkridner@...gleboard.org>,
Robert Nelson <robertcnelson@...gleboard.org>,
Drew Fustini <drew@...gleboard.org>
Subject: Re: [PATCH] arm: dts: am33xx-bone-common: add gpio-line-names
Hi,
Adding Linus W to Cc, would be good to get some comments on this.
* Drew Fustini <drew@...gleboard.org> [200508 09:58]:
> Add gpio-line-names properties to the gpio controller nodes.
> BeagleBone boards have P8 and P9 headers [0] which expose many the
> AM3358 SoC balls to stacking expansion boards called "capes", or to
> other external connections like jumper wires to a breadboard.
>
> Many of the P8/P9 header pins can muxed to a gpio line. The
> gpio-line-names describe which P8/P9 pin that line goes to and the
> default mux for that P8/P9 pin. Some lines are not routed to the
> P8/P9 headers, but instead are dedicated to some functionality such as
> status LEDs. The line name will indicate this. Some line names are
> left empty as the corresponding AM3358 balls are not connected.
>
> The goal is to make it easier for a user viewing the output of gpioinfo
> to determine which P8/P9 pin is connected to a line. The output of
> gpioinfo on a BeagleBone Black will now look like this:
>
> gpiochip0 - 32 lines:
> line 0: "ethernet" unused input active-high
> line 1: "ethernet" unused input active-high
> line 2: "P9_22 spi0_sclk" unused input active-high
> line 3: "P9_21 spi0_d0" unused input active-high
> line 4: "P9_18 spi0_d1" unused input active-high
> line 5: "P9_17 spi0_cs0" unused input active-high
> line 6: "sd card" "cd" input active-low [used]
> line 7: "P9_42A ecappwm0" unused input active-high
> line 8: "P8_35 hdmi" unused input active-high
> line 9: "P8_33 hdmi" unused input active-high
> line 10: "P8_31 hdmi" unused input active-high
> line 11: "P8_32 hdmi" unused input active-high
> line 12: "P9_20 i2c2_sda" unused input active-high
> line 13: "P9_19 i2c2_scl" unused input active-high
> line 14: "P9_26 uart1_rxd" unused input active-high
> line 15: "P9_24 uart1_txd" unused input active-high
> line 16: "ethernet" unused input active-high
> line 17: "ethernet" unused input active-high
> line 18: "usb" unused input active-high
> line 19: "hdmi" unused input active-high
> line 20: "P9_41B gpio" unused input active-high
> line 21: "ethernet" unused input active-high
> line 22: "P8_19 ehrpwm2a" unused input active-high
> line 23: "P8_13 ehrpwm2b" unused input active-high
> line 24: unnamed unused input active-high
> line 25: unnamed unused input active-high
> line 26: "P8_14 gpio" unused input active-high
> line 27: "P8_17 gpio" unused input active-high
> line 28: "ethernet" unused input active-high
> line 29: "ethernet" unused input active-high
> line 30: "P9_11 uart4_rxd" unused input active-high
> line 31: "P9_13 uart4_txd" unused input active-high
> gpiochip1 - 32 lines:
> line 0: "P8_25 emmc" unused input active-high
> line 1: "emmc" unused input active-high
> line 2: "P8_5 emmc" unused input active-high
> line 3: "P8_6 emmc" unused input active-high
> line 4: "P8_23 emmc" unused input active-high
> line 5: "P8_22 emmc" unused input active-high
> line 6: "P8_3 emmc" unused input active-high
> line 7: "P8_4 emmc" 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: "P8_12 gpio" unused input active-high
> line 13: "P8_11 gpio" unused input active-high
> line 14: "P8_16 gpio" unused input active-high
> line 15: "P8_15 gpio" unused input active-high
> line 16: "P9_15A gpio" unused input active-high
> line 17: "P9_23 gpio" unused input active-high
> line 18: "P9_14 ehrpwm1a" unused input active-high
> line 19: "P9_16 ehrpwm1b" unused input active-high
> line 20: "emmc" unused input active-high
> line 21: "usr0 led" "beaglebone:green:heart" output active-high [used]
> line 22: "usr1 led" "beaglebone:green:mmc0" output active-high [used]
> line 23: "usr2 led" "beaglebone:green:usr2" output active-high [used]
> line 24: "usr3 led" "beaglebone:green:usr3" output active-high [used]
> line 25: "hdmi" "interrupt" input active-high [used]
> line 26: "usb" unused input active-high
> line 27: "hdmi audio" "enable" output active-high [used]
> line 28: "P9_12 gpio" unused input active-high
> line 29: "P8_26 gpio" unused input active-high
> line 30: "P8_21 emmc" unused input active-high
> line 31: "P8_20 emmc" unused input active-high
> gpiochip2 - 32 lines:
> line 0: "P9_15B gpio" unused input active-high
> line 1: "P8_18 gpio" unused input active-high
> line 2: "P8_7 gpio" unused input active-high
> line 3: "P8_8 gpio" unused input active-high
> line 4: "P8_10 gpio" unused input active-high
> line 5: "P8_9 gpio" unused input active-high
> line 6: "P8_45 hdmi" unused input active-high
> line 7: "P8_46 hdmi" unused input active-high
> line 8: "P8_43 hdmi" unused input active-high
> line 9: "P8_44 hdmi" unused input active-high
> line 10: "P8_41 hdmi" unused input active-high
> line 11: "P8_42 hdmi" unused input active-high
> line 12: "P8_39 hdmi" unused input active-high
> line 13: "P8_40 hdmi" unused input active-high
> line 14: "P8_37 hdmi" unused input active-high
> line 15: "P8_38 hdmi" unused input active-high
> line 16: "P8_36 hdmi" unused input active-high
> line 17: "P8_34 hdmi" unused input active-high
> line 18: "ethernet" unused input active-high
> line 19: "ethernet" unused input active-high
> line 20: "ethernet" unused input active-high
> line 21: "ethernet" unused input active-high
> line 22: "P8_27 hdmi" unused input active-high
> line 23: "P8_29 hdmi" unused input active-high
> line 24: "P8_28 hdmi" unused input active-high
> line 25: "P8_30 hdmi" unused input active-high
> line 26: "emmc" unused input active-high
> line 27: "emmc" unused input active-high
> line 28: "emmc" unused input active-high
> line 29: "emmc" unused input active-high
> line 30: "emmc" unused input active-high
> line 31: "emmc" unused input active-high
> gpiochip3 - 32 lines:
> line 0: "ethernet" unused input active-high
> line 1: "ethernet" unused input active-high
> line 2: "ethernet" unused input active-high
> line 3: "ethernet" unused input active-high
> line 4: "ethernet" unused input active-high
> line 5: "i2c0" unused input active-high
> line 6: "i2c0" unused input active-high
> line 7: "emu" unused input active-high
> line 8: "emu" unused input active-high
> line 9: "ethernet" unused input active-high
> line 10: "ethernet" unused input active-high
> line 11: unnamed unused input active-high
> line 12: unnamed unused input active-high
> line 13: "usb" unused input active-high
> line 14: "P9_31 spi1_sclk" unused input active-high
> line 15: "P9_29 spi1_d0" unused input active-high
> line 16: "P9_30 spi1_d1" unused input active-high
> line 17: "P9_28 spi1_cs0" unused input active-high
> line 18: "P9_42B ecappwm0" unused input active-high
> line 19: "P9_27 gpio" unused input active-high
> line 20: "P9_41A gpio" unused input active-high
> line 21: "P9_25 gpio" unused input active-high
> line 22: unnamed unused input active-high
> line 23: unnamed unused input active-high
> line 24: unnamed unused input active-high
> line 25: unnamed unused input active-high
> line 26: unnamed unused input active-high
> line 27: unnamed unused input active-high
> line 28: unnamed unused input active-high
> line 29: unnamed unused input active-high
> line 30: unnamed unused input active-high
> line 31: unnamed unused input active-high
>
> [0] https://beagleboard.org/Support/bone101
> [1] https://beagleboard.org/capes
>
> Reviewed-by: Jason Kridner <jason@...gleboard.org>
> Reviewed-by: Robert Nelson <robertcnelson@...il.com>
> Signed-off-by: Drew Fustini <drew@...gleboard.org>
> ---
> arch/arm/boot/dts/am335x-bone-common.dtsi | 144 ++++++++++++++++++++++
> 1 file changed, 144 insertions(+)
>
> diff --git a/arch/arm/boot/dts/am335x-bone-common.dtsi b/arch/arm/boot/dts/am335x-bone-common.dtsi
> index 6c9187bc0f17..defdf68edb58 100644
> --- a/arch/arm/boot/dts/am335x-bone-common.dtsi
> +++ b/arch/arm/boot/dts/am335x-bone-common.dtsi
> @@ -397,3 +397,147 @@
> clocks = <&clk_32768_ck>, <&clk_24mhz_clkctrl AM3_CLK_24MHZ_CLKDIV32K_CLKCTRL 0>;
> clock-names = "ext-clk", "int-clk";
> };
> +
> +&gpio0 {
> + gpio-line-names =
> + "ethernet",
> + "ethernet",
> + "P9_22 spi0_sclk",
> + "P9_21 spi0_d0",
> + "P9_18 spi0_d1",
> + "P9_17 spi0_cs0",
> + "sd card",
> + "P9_42A ecappwm0",
> + "P8_35 hdmi",
> + "P8_33 hdmi",
> + "P8_31 hdmi",
> + "P8_32 hdmi",
> + "P9_20 i2c2_sda",
> + "P9_19 i2c2_scl",
> + "P9_26 uart1_rxd",
> + "P9_24 uart1_txd",
> + "ethernet",
> + "ethernet",
> + "usb",
> + "hdmi",
> + "P9_41B gpio",
> + "ethernet",
> + "P8_19 ehrpwm2a",
> + "P8_13 ehrpwm2b",
> + "",
> + "",
> + "P8_14 gpio",
> + "P8_17 gpio",
> + "ethernet",
> + "ethernet",
> + "P9_11 uart4_rxd",
> + "P9_13 uart4_txd";
> +};
> +
> +&gpio1 {
> + gpio-line-names =
> + "P8_25 emmc",
> + "emmc",
> + "P8_5 emmc",
> + "P8_6 emmc",
> + "P8_23 emmc",
> + "P8_22 emmc",
> + "P8_3 emmc",
> + "P8_4 emmc",
> + "",
> + "",
> + "",
> + "",
> + "P8_12 gpio",
> + "P8_11 gpio",
> + "P8_16 gpio",
> + "P8_15 gpio",
> + "P9_15A gpio",
> + "P9_23 gpio",
> + "P9_14 ehrpwm1a",
> + "P9_16 ehrpwm1b",
> + "emmc",
> + "usr0 led",
> + "usr1 led",
> + "usr2 led",
> + "usr3 led",
> + "hdmi",
> + "usb",
> + "hdmi audio",
> + "P9_12 gpio",
> + "P8_26 gpio",
> + "P8_21 emmc",
> + "P8_20 emmc";
> +};
> +
> +&gpio2 {
> + gpio-line-names =
> + "P9_15B gpio",
> + "P8_18 gpio",
> + "P8_7 gpio",
> + "P8_8 gpio",
> + "P8_10 gpio",
> + "P8_9 gpio",
> + "P8_45 hdmi",
> + "P8_46 hdmi",
> + "P8_43 hdmi",
> + "P8_44 hdmi",
> + "P8_41 hdmi",
> + "P8_42 hdmi",
> + "P8_39 hdmi",
> + "P8_40 hdmi",
> + "P8_37 hdmi",
> + "P8_38 hdmi",
> + "P8_36 hdmi",
> + "P8_34 hdmi",
> + "ethernet",
> + "ethernet",
> + "ethernet",
> + "ethernet",
> + "P8_27 hdmi",
> + "P8_29 hdmi",
> + "P8_28 hdmi",
> + "P8_30 hdmi",
> + "emmc",
> + "emmc",
> + "emmc",
> + "emmc",
> + "emmc",
> + "emmc";
> +};
> +
> +&gpio3 {
> + gpio-line-names =
> + "ethernet",
> + "ethernet",
> + "ethernet",
> + "ethernet",
> + "ethernet",
> + "i2c0",
> + "i2c0",
> + "emu",
> + "emu",
> + "ethernet",
> + "ethernet",
> + "",
> + "",
> + "usb",
> + "P9_31 spi1_sclk",
> + "P9_29 spi1_d0",
> + "P9_30 spi1_d1",
> + "P9_28 spi1_cs0",
> + "P9_42B ecappwm0",
> + "P9_27 gpio",
> + "P9_41A gpio",
> + "P9_25 gpio",
> + "",
> + "",
> + "",
> + "",
> + "",
> + "",
> + "",
> + "",
> + "",
> + "";
> +};
> --
> 2.20.1
>
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