This patch add support for the imx6dl based aristainetos board with following configuration: CPU: Freescale i.MX6DL rev1.1 at 792 MHz DRAM: 1 GiB NAND: 512 MiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 SF: Detected N25Q128 with page size 256 Bytes, erase size 64 KiB, total 16 MiB As this board can used with 2 different display types, the differences between them are extracted into 2 DTS files, and the common settings are collected in a common file. Signed-off-by: Heiko Schocher <hs@xxxxxxx> --- Cc: Shawn Guo <shawn.guo@xxxxxxxxxxxxx> Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx> Cc: devicetree@xxxxxxxxxxxxxxx <devicetree@xxxxxxxxxxxxxxx> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx - changes for v2: add comments from Shawn Guo: - fixed patch subject - move 'status' at the bottom of property list - sort nodes alphabetical - use macro in include/dt-bindings/gpio/gpio.h - renamed regulator node name to generic name - removed partition table - move iomuxc node to the end - remove Codingstyle issues - sort pinctrl entries alphabetically - remove pinctrl_backlight and pinctrl_gpio - use specific pad configuration arch/arm/boot/dts/Makefile | 2 + arch/arm/boot/dts/imx6dl-aristainetos_4.dts | 85 ++++++ arch/arm/boot/dts/imx6dl-aristainetos_7.dts | 74 +++++ arch/arm/boot/dts/imx6qdl-aristainetos.dtsi | 400 ++++++++++++++++++++++++++++ 4 files changed, 561 insertions(+) create mode 100644 arch/arm/boot/dts/imx6dl-aristainetos_4.dts create mode 100644 arch/arm/boot/dts/imx6dl-aristainetos_7.dts create mode 100644 arch/arm/boot/dts/imx6qdl-aristainetos.dtsi diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile index 5986ff6..3b9a275 100644 --- a/arch/arm/boot/dts/Makefile +++ b/arch/arm/boot/dts/Makefile @@ -182,6 +182,8 @@ dtb-$(CONFIG_ARCH_MXC) += \ imx53-tx53-x03x.dtb \ imx53-tx53-x13x.dtb \ imx53-voipac-bsb.dtb \ + imx6dl-aristainetos_4.dtb \ + imx6dl-aristainetos_7.dtb \ imx6dl-cubox-i.dtb \ imx6dl-dfi-fs700-m60.dtb \ imx6dl-gw51xx.dtb \ diff --git a/arch/arm/boot/dts/imx6dl-aristainetos_4.dts b/arch/arm/boot/dts/imx6dl-aristainetos_4.dts new file mode 100644 index 0000000..9cd06e5 --- /dev/null +++ b/arch/arm/boot/dts/imx6dl-aristainetos_4.dts @@ -0,0 +1,85 @@ +/* + * support fot the imx6 based aristainetos board + * + * Copyright (C) 2014 Heiko Schocher <hs@xxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +/dts-v1/; +#include "imx6dl.dtsi" +#include "imx6qdl-aristainetos.dtsi" + +/ { + model = "aristainetos i.MX6 Dual Lite Board 4"; + compatible = "fsl,imx6dl"; + + backlight { + compatible = "pwm-backlight"; + pwms = <&pwm1 0 5000000>; + brightness-levels = <0 4 8 16 32 64 128 255>; + default-brightness-level = <7>; + enable-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_backlight>; + status = "okay"; + }; + + memory { + reg = <0x10000000 0x40000000>; + }; + + soc { + display0: display@di0 { + compatible = "fsl,imx-parallel-display"; + interface-pix-fmt = "rgb24"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_ipu_disp>; + status = "okay"; + + display-timings { + 480x800p60 { + native-mode; + clock-frequency = <30000000>; + hactive = <480>; + vactive = <800>; + hfront-porch = <59>; + hback-porch = <10>; + hsync-len = <10>; + vback-porch = <15>; + vfront-porch = <15>; + vsync-len = <15>; + hsync-active = <1>; + vsync-active = <1>; + }; + }; + + port { + display0_in: endpoint { + remote-endpoint = <&ipu1_di0_disp0>; + }; + }; + }; + }; +}; + +&ecspi2 { + fsl,spi-num-chipselects = <1>; + cs-gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_ecspi2>; + status = "okay"; +}; + +&i2c2 { + clock-frequency = <100000>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c2>; + status = "okay"; +}; + +&ipu1_di0_disp0 { + remote-endpoint = <&display0_in>; +}; diff --git a/arch/arm/boot/dts/imx6dl-aristainetos_7.dts b/arch/arm/boot/dts/imx6dl-aristainetos_7.dts new file mode 100644 index 0000000..b413e24 --- /dev/null +++ b/arch/arm/boot/dts/imx6dl-aristainetos_7.dts @@ -0,0 +1,74 @@ +/* + * support fot the imx6 based aristainetos board + * + * Copyright (C) 2014 Heiko Schocher <hs@xxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ +/dts-v1/; +#include "imx6dl.dtsi" +#include "imx6qdl-aristainetos.dtsi" + +/ { + model = "aristainetos i.MX6 Dual Lite Board 7"; + compatible = "fsl,imx6dl"; + + memory { + reg = <0x10000000 0x40000000>; + }; + + soc { + display0: display@di0 { + compatible = "fsl,imx-parallel-display"; + interface-pix-fmt = "rgb24"; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_ipu_disp>; + status = "okay"; + + display-timings { + 800x480p60 { + native-mode; + clock-frequency = <33246000>; + hactive = <800>; + vactive = <480>; + hfront-porch = <88>; + hback-porch = <88>; + hsync-len = <80>; + vback-porch = <10>; + vfront-porch = <10>; + vsync-len = <25>; + vsync-active = <1>; + }; + }; + + port { + display0_in: endpoint { + remote-endpoint = <&ipu1_di0_disp0>; + }; + }; + }; + }; + + backlight { + compatible = "pwm-backlight"; + pwms = <&pwm3 0 3000>; + brightness-levels = <0 4 8 16 32 64 128 255>; + default-brightness-level = <6>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_backlight>; + }; +}; + +&i2c2 { + clock-frequency = <100000>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c2>; + status = "okay"; +}; + +&ipu1_di0_disp0 { + remote-endpoint = <&display0_in>; +}; diff --git a/arch/arm/boot/dts/imx6qdl-aristainetos.dtsi b/arch/arm/boot/dts/imx6qdl-aristainetos.dtsi new file mode 100644 index 0000000..b7f41fa --- /dev/null +++ b/arch/arm/boot/dts/imx6qdl-aristainetos.dtsi @@ -0,0 +1,400 @@ +/* + * support fot the imx6 based aristainetos board + * + * Copyright (C) 2014 Heiko Schocher <hs@xxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <dt-bindings/gpio/gpio.h> + +/ { + regulators { + compatible = "simple-bus"; + + reg_2p5v: regulator@0 { + compatible = "regulator-fixed"; + regulator-name = "2P5V"; + regulator-min-microvolt = <2500000>; + regulator-max-microvolt = <2500000>; + regulator-always-on; + }; + + reg_3p3v: regulator@1 { + compatible = "regulator-fixed"; + regulator-name = "3P3V"; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + regulator-always-on; + }; + + reg_usbh1_vbus: regulator@2 { + compatible = "regulator-fixed"; + enable-active-high; + gpio = <&gpio3 31 GPIO_ACTIVE_HIGH>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_aristainetos_usbh1_vbus>; + regulator-name = "usb_h1_vbus"; + regulator-min-microvolt = <5000000>; + regulator-max-microvolt = <5000000>; + }; + + reg_usbotg_vbus: regulator@3 { + compatible = "regulator-fixed"; + enable-active-high; + gpio = <&gpio4 15 GPIO_ACTIVE_HIGH>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_aristainetos_usbotg_vbus>; + regulator-name = "usb_otg_vbus"; + regulator-min-microvolt = <5000000>; + regulator-max-microvolt = <5000000>; + }; + }; +}; + +&audmux { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_audmux>; + status = "okay"; +}; + +&can1 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_flexcan1>; + status = "okay"; +}; + +&can2 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_flexcan2>; + status = "okay"; +}; + +&i2c1 { + clock-frequency = <100000>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c1>; + status = "okay"; + + tmp103: tmp103@71 { + compatible = "ti,tmp103"; + reg = <0x71>; + }; +}; + +&i2c3 { + clock-frequency = <100000>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c3>; + status = "okay"; + + rtc@68 { + compatible = "dallas,m41t00"; + reg = <0x68>; + }; +}; + +&ecspi4 { + fsl,spi-num-chipselects = <1>; + cs-gpios = <&gpio3 20 0>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_ecspi4>; + status = "okay"; + + flash: m25p80@0 { + #address-cells = <1>; + #size-cells = <1>; + compatible = "micron,n25q128a11"; + spi-max-frequency = <20000000>; + reg = <0>; + }; +}; + +&fec { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_enet>; + phy-mode = "rmii"; + phy-reset-gpios = <&gpio3 29 GPIO_ACTIVE_HIGH>; + status = "okay"; +}; + +&gpmi { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_gpmi_nand>; + status = "okay"; +}; + +&pcie { + status = "okay"; +}; + +&uart2 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_uart2>; + status = "okay"; +}; + + +&uart4 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_uart4>; + fsl,uart-has-rtscts; + status = "okay"; +}; + +&uart5 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_uart5>; + fsl,uart-has-rtscts; + status = "okay"; +}; + +&usbh1 { + vbus-supply = <®_usbh1_vbus>; + dr_mode = "host"; + status = "okay"; +}; + +&usbotg { + vbus-supply = <®_usbotg_vbus>; + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_usbotg>; + disable-over-current; + dr_mode = "host"; + status = "okay"; +}; + +&usdhc1 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_usdhc1>; + vmmc-supply = <®_3p3v>; + cd-gpios = <&gpio4 7 GPIO_ACTIVE_HIGH>; + status = "okay"; +}; + +&usdhc2 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_usdhc2>; + vmmc-supply = <®_3p3v>; + cd-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>; + status = "okay"; +}; + +&iomuxc { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_hog>; + + imx6qdl-aristainetos { + pinctrl_aristainetos_usbh1_vbus: aristainetos-usbh1-vbus { + fsl,pins = <MX6QDL_PAD_EIM_D31__GPIO3_IO31 0x130b0>; + }; + + pinctrl_aristainetos_usbotg_vbus: aristainetos-usbotg-vbus { + fsl,pins = <MX6QDL_PAD_KEY_ROW4__GPIO4_IO15 0x130b0>; + }; + + pinctrl_audmux: audmuxgrp { + fsl,pins = < + MX6QDL_PAD_CSI0_DAT7__AUD3_RXD 0x80000000 + MX6QDL_PAD_CSI0_DAT4__AUD3_TXC 0x80000000 + MX6QDL_PAD_CSI0_DAT5__AUD3_TXD 0x80000000 + MX6QDL_PAD_CSI0_DAT6__AUD3_TXFS 0x80000000 + >; + }; + + pinctrl_backlight: backlightgrp { + fsl,pins = < + MX6QDL_PAD_GPIO_9__PWM1_OUT 0x1b0b0 + MX6QDL_PAD_SD4_DAT1__PWM3_OUT 0x1b0b0 + MX6QDL_PAD_GPIO_2__GPIO1_IO02 0x1b0b0 + >; + }; + + pinctrl_ecspi2: ecspi2grp { + fsl,pins = < + MX6QDL_PAD_EIM_OE__ECSPI2_MISO 0x100b1 + MX6QDL_PAD_EIM_CS0__ECSPI2_SCLK 0x100b1 + MX6QDL_PAD_EIM_CS1__ECSPI2_MOSI 0x100b1 + MX6QDL_PAD_EIM_D24__GPIO3_IO24 0x100b1 + >; + }; + + pinctrl_ecspi4: ecspi4grp { + fsl,pins = < + MX6QDL_PAD_EIM_D21__ECSPI4_SCLK 0x100b1 + MX6QDL_PAD_EIM_D22__ECSPI4_MISO 0x100b1 + MX6QDL_PAD_EIM_D28__ECSPI4_MOSI 0x100b1 + MX6QDL_PAD_EIM_D20__GPIO3_IO20 0x100b1 + MX6QDL_PAD_SD4_DAT7__GPIO2_IO15 0x1b0b0 /* WP pin */ + >; + }; + + pinctrl_enet: enetgrp { + fsl,pins = < + MX6QDL_PAD_GPIO_16__ENET_REF_CLK 0x4001b0a8 + MX6QDL_PAD_ENET_MDIO__ENET_MDIO 0x1b0b0 + MX6QDL_PAD_ENET_MDC__ENET_MDC 0x1b0b0 + MX6QDL_PAD_ENET_TXD0__ENET_TX_DATA0 0x1b0b0 + MX6QDL_PAD_ENET_TXD1__ENET_TX_DATA1 0x1b0b0 + MX6QDL_PAD_ENET_TX_EN__ENET_TX_EN 0x1b0b0 + MX6QDL_PAD_ENET_RX_ER__ENET_RX_ER 0x1b0b0 + MX6QDL_PAD_ENET_RXD0__ENET_RX_DATA0 0x1b0b0 + MX6QDL_PAD_ENET_RXD1__ENET_RX_DATA1 0x1b0b0 + MX6QDL_PAD_ENET_CRS_DV__ENET_RX_EN 0x1b0b0 + >; + }; + + pinctrl_flexcan1: flexcan1grp { + fsl,pins = < + MX6QDL_PAD_KEY_ROW2__FLEXCAN1_RX 0x80000000 + MX6QDL_PAD_KEY_COL2__FLEXCAN1_TX 0x80000000 + >; + }; + + pinctrl_flexcan2: flexcan2grp { + fsl,pins = < + MX6QDL_PAD_SD3_DAT0__FLEXCAN2_TX 0x80000000 + MX6QDL_PAD_SD3_DAT1__FLEXCAN2_RX 0x80000000 + >; + }; + + pinctrl_gpmi_nand: gpminandgrp { + fsl,pins = < + MX6QDL_PAD_NANDF_CLE__NAND_CLE 0xb0b1 + MX6QDL_PAD_NANDF_ALE__NAND_ALE 0xb0b1 + MX6QDL_PAD_NANDF_WP_B__NAND_WP_B 0xb0b1 + MX6QDL_PAD_NANDF_RB0__NAND_READY_B 0xb000 + MX6QDL_PAD_NANDF_CS0__NAND_CE0_B 0xb0b1 + MX6QDL_PAD_NANDF_CS1__NAND_CE1_B 0xb0b1 + MX6QDL_PAD_SD4_CMD__NAND_RE_B 0xb0b1 + MX6QDL_PAD_SD4_CLK__NAND_WE_B 0xb0b1 + MX6QDL_PAD_NANDF_D0__NAND_DATA00 0xb0b1 + MX6QDL_PAD_NANDF_D1__NAND_DATA01 0xb0b1 + MX6QDL_PAD_NANDF_D2__NAND_DATA02 0xb0b1 + MX6QDL_PAD_NANDF_D3__NAND_DATA03 0xb0b1 + MX6QDL_PAD_NANDF_D4__NAND_DATA04 0xb0b1 + MX6QDL_PAD_NANDF_D5__NAND_DATA05 0xb0b1 + MX6QDL_PAD_NANDF_D6__NAND_DATA06 0xb0b1 + MX6QDL_PAD_NANDF_D7__NAND_DATA07 0xb0b1 + MX6QDL_PAD_SD4_DAT0__NAND_DQS 0x00b1 + >; + }; + + pinctrl_hog: hoggrp { + fsl,pins = < + MX6QDL_PAD_EIM_D29__GPIO3_IO29 0x10 + >; + }; + + pinctrl_i2c1: i2c1grp { + fsl,pins = < + MX6QDL_PAD_CSI0_DAT8__I2C1_SDA 0x4001b8b1 + MX6QDL_PAD_CSI0_DAT9__I2C1_SCL 0x4001b8b1 + >; + }; + + pinctrl_i2c2: i2c2grp { + fsl,pins = < + MX6QDL_PAD_KEY_COL3__I2C2_SCL 0x4001b8b1 + MX6QDL_PAD_KEY_ROW3__I2C2_SDA 0x4001b8b1 + >; + }; + + pinctrl_i2c3: i2c3grp { + fsl,pins = < + MX6QDL_PAD_EIM_D17__I2C3_SCL 0x4001b8b1 + MX6QDL_PAD_EIM_D18__I2C3_SDA 0x4001b8b1 + >; + }; + + pinctrl_ipu_disp: ipudisp1grp { + fsl,pins = < + MX6QDL_PAD_DI0_DISP_CLK__IPU1_DI0_DISP_CLK 0x10 + MX6QDL_PAD_DI0_PIN15__IPU1_DI0_PIN15 0x10 + MX6QDL_PAD_DI0_PIN2__IPU1_DI0_PIN02 0x10 + MX6QDL_PAD_DI0_PIN3__IPU1_DI0_PIN03 0x10 + MX6QDL_PAD_DI0_PIN4__GPIO4_IO20 0x20000 + MX6QDL_PAD_DISP0_DAT0__IPU1_DISP0_DATA00 0x10 + MX6QDL_PAD_DISP0_DAT1__IPU1_DISP0_DATA01 0x10 + MX6QDL_PAD_DISP0_DAT2__IPU1_DISP0_DATA02 0x10 + MX6QDL_PAD_DISP0_DAT3__IPU1_DISP0_DATA03 0x10 + MX6QDL_PAD_DISP0_DAT4__IPU1_DISP0_DATA04 0x10 + MX6QDL_PAD_DISP0_DAT5__IPU1_DISP0_DATA05 0x10 + MX6QDL_PAD_DISP0_DAT6__IPU1_DISP0_DATA06 0x10 + MX6QDL_PAD_DISP0_DAT7__IPU1_DISP0_DATA07 0x10 + MX6QDL_PAD_DISP0_DAT8__IPU1_DISP0_DATA08 0x10 + MX6QDL_PAD_DISP0_DAT9__IPU1_DISP0_DATA09 0x10 + MX6QDL_PAD_DISP0_DAT10__IPU1_DISP0_DATA10 0x10 + MX6QDL_PAD_DISP0_DAT11__IPU1_DISP0_DATA11 0x10 + MX6QDL_PAD_DISP0_DAT12__IPU1_DISP0_DATA12 0x10 + MX6QDL_PAD_DISP0_DAT13__IPU1_DISP0_DATA13 0x10 + MX6QDL_PAD_DISP0_DAT14__IPU1_DISP0_DATA14 0x10 + MX6QDL_PAD_DISP0_DAT15__IPU1_DISP0_DATA15 0x10 + MX6QDL_PAD_DISP0_DAT16__IPU1_DISP0_DATA16 0x10 + MX6QDL_PAD_DISP0_DAT17__IPU1_DISP0_DATA17 0x10 + MX6QDL_PAD_DISP0_DAT18__IPU1_DISP0_DATA18 0x10 + MX6QDL_PAD_DISP0_DAT19__IPU1_DISP0_DATA19 0x10 + MX6QDL_PAD_DISP0_DAT20__IPU1_DISP0_DATA20 0x10 + MX6QDL_PAD_DISP0_DAT21__IPU1_DISP0_DATA21 0x10 + MX6QDL_PAD_DISP0_DAT22__IPU1_DISP0_DATA22 0x10 + MX6QDL_PAD_DISP0_DAT23__IPU1_DISP0_DATA23 0x10 + >; + }; + + pinctrl_uart2: uart2grp { + fsl,pins = < + MX6QDL_PAD_EIM_D26__UART2_TX_DATA 0x1b0b1 + MX6QDL_PAD_EIM_D27__UART2_RX_DATA 0x1b0b1 + >; + }; + + pinctrl_uart4: uart4grp { + fsl,pins = < + MX6QDL_PAD_CSI0_DAT12__UART4_TX_DATA 0x1b0b1 + MX6QDL_PAD_CSI0_DAT13__UART4_RX_DATA 0x1b0b1 + MX6QDL_PAD_CSI0_DAT16__UART4_RTS_B 0x1b0b1 + MX6QDL_PAD_CSI0_DAT17__UART4_CTS_B 0x1b0b1 + >; + }; + + pinctrl_uart5: uart5grp { + fsl,pins = < + MX6QDL_PAD_CSI0_DAT14__UART5_TX_DATA 0x1b0b1 + MX6QDL_PAD_CSI0_DAT15__UART5_RX_DATA 0x1b0b1 + >; + }; + + pinctrl_usbotg: usbotggrp { + fsl,pins = < + MX6QDL_PAD_GPIO_1__USB_OTG_ID 0x17059 + >; + }; + + pinctrl_usdhc1: usdhc1grp { + fsl,pins = < + MX6QDL_PAD_SD1_CMD__SD1_CMD 0x17059 + MX6QDL_PAD_SD1_CLK__SD1_CLK 0x10059 + MX6QDL_PAD_SD1_DAT0__SD1_DATA0 0x17059 + MX6QDL_PAD_SD1_DAT1__SD1_DATA1 0x17059 + MX6QDL_PAD_SD1_DAT2__SD1_DATA2 0x17059 + MX6QDL_PAD_SD1_DAT3__SD1_DATA3 0x17059 + MX6QDL_PAD_KEY_ROW0__GPIO4_IO07 0x1b0b0 + >; + }; + + pinctrl_usdhc2: usdhc2grp { + fsl,pins = < + MX6QDL_PAD_SD2_CMD__SD2_CMD 0x17059 + MX6QDL_PAD_SD2_CLK__SD2_CLK 0x10059 + MX6QDL_PAD_SD2_DAT0__SD2_DATA0 0x17059 + MX6QDL_PAD_SD2_DAT1__SD2_DATA1 0x17059 + MX6QDL_PAD_SD2_DAT2__SD2_DATA2 0x17059 + MX6QDL_PAD_SD2_DAT3__SD2_DATA3 0x17059 + MX6QDL_PAD_KEY_COL1__GPIO4_IO08 0x1b0b0 + >; + }; + }; +}; -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html