Hi All,
I have compiled openwrt CC 15.05 for MT7621A. I can login using console, see web server on LAN.
now I wan to use GPIO#6 as a reset configuration to default pin. for that I need to use this pin as a input
button.
I trace source to get
build_dir/target-mipsel_1004kc+dsp_uClibc-0.9.33.2/linux-ramips_mt7621/linux-3.18.21/arch/mips/ralink/mt7621.c
where gpio are configured. This is yet now clear but I found I can control gpio#10 using sys/class/gpio as a output
but gpio#6 as a input do not read value after button press.
gpio#6 is multi function pin UART3 CTS3_N/GPIO and need to be configured in GPIO MODE register.
I want to make sure it is gpio and not UART3 pin but sys get gpio6, but still I just want to make sure it is gpio pin.
in ralink/mt7621.c
static struct rt2880_pmx_group mt7621_pinmux_data[] = {
GRP("uart1", uart1_grp, 1, MT7621_GPIO_MODE_UART1),
GRP("i2c", i2c_grp, 1, MT7621_GPIO_MODE_I2C),
GRP("uart3", uart2_grp, 1, MT7621_GPIO_MODE_UART2),
GRP("uart2", uart3_grp, 1, MT7621_GPIO_MODE_UART3),
GRP("jtag", jtag_grp, 1, MT7621_GPIO_MODE_JTAG),
GRP_G("wdt", wdt_grp, MT7621_GPIO_MODE_WDT_MASK,
MT7621_GPIO_MODE_WDT_GPIO, MT7621_GPIO_MODE_WDT_SHIFT),
GRP_G("pcie", pcie_rst_grp, MT7621_GPIO_MODE_PCIE_MASK,
MT7621_GPIO_MODE_PCIE_GPIO, MT7621_GPIO_MODE_PCIE_SHIFT),
GRP("mdio", mdio_grp, 1, MT7621_GPIO_MODE_MDIO),
GRP("rgmii2", rgmii2_grp, 1, MT7621_GPIO_MODE_RGMII2),
GRP_G("spi", spi_grp, MT7621_GPIO_MODE_SPI_MASK,
MT7621_GPIO_MODE_SPI_GPIO, MT7621_GPIO_MODE_SPI_SHIFT),
GRP_G("sdhci", sdhci_grp, MT7621_GPIO_MODE_SDHCI_MASK,
MT7621_GPIO_MODE_SDHCI_GPIO, MT7621_GPIO_MODE_SDHCI_SHIFT),
GRP("rgmii1", rgmii1_grp, 1, MT7621_GPIO_MODE_RGMII1),
{ 0 }
};
here
GRP("uart3", uart2_grp, 1, MT7621_GPIO_MODE_UART2),
GRP("uart2", uart3_grp, 1, MT7621_GPIO_MODE_UART3),
above is bit confusing or is it bug that urt2 is mixed with uar3 ??????
I want to disable UART3 and expect gpio#6 will be gpio only as it is gpio after reset by default.
Is there any good link or info about gpio for CC version ??
any hint will be appreciated!!
Thanks in advance !