Part Number: PROCESSOR-SDK-AM335X
It seems 335x has UART using limitations.
/dev/ttyS0 - /dev/ttyS3 device(UART0,UART1,UART2,UART4),
1. and I registered one more UART(UART3), got message "can not register UART4 820 drivers" in dmesg
2. then disable UART2, all goes well
3. helping.... thanks
myuart1_pins_default: myuart1_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x970, PIN_INPUT | MUX_MODE0) /* (E15) uart0_rxd.uart0_rxd */
AM33XX_IOPAD(0x974, PIN_OUTPUT | MUX_MODE0) /* (E16) uart0_txd.uart0_txd */
>;
};
/* Optional sleep pin settings. Must manually enter values in the below skeleton. */
myuart1_pins_sleep: myuart1_pins_sleep {
pinctrl-single,pins = <
AM33XX_IOPAD(0x970, ) /* (E15) uart0_rxd.uart0_rxd */
AM33XX_IOPAD(0x974, ) /* (E16) uart0_txd.uart0_txd */
>;
};
myuart2_pins_default: myuart2_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x980, PIN_INPUT | MUX_MODE0) /* (D16) uart1_rxd.uart1_rxd */
AM33XX_IOPAD(0x984, PIN_OUTPUT | MUX_MODE0) /* (D15) uart1_txd.uart1_txd */
>;
};
/* Optional sleep pin settings. Must manually enter values in the below skeleton. */
myuart2_pins_sleep: myuart2_pins_sleep {
pinctrl-single,pins = <
AM33XX_IOPAD(0x980, ) /* (D16) uart1_rxd.uart1_rxd */
AM33XX_IOPAD(0x984, ) /* (D15) uart1_txd.uart1_txd */
>;
};
myuart3_pins_default: myuart3_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x950, PIN_INPUT | MUX_MODE1) /* (A17) spi0_sclk.uart2_rxd */
AM33XX_IOPAD(0x954, PIN_OUTPUT | MUX_MODE1) /* (B17) spi0_d0.uart2_txd */
>;
};
/* Optional sleep pin settings. Must manually enter values in the below skeleton. */
myuart3_pins_sleep: myuart3_pins_sleep {
pinctrl-single,pins = <
AM33XX_IOPAD(0x950, ) /* (A17) spi0_sclk.uart2_rxd */
AM33XX_IOPAD(0x954, ) /* (B17) spi0_d0.uart2_txd */
>;
};
myuart4_pins_default: myuart4_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8f8, PIN_INPUT | MUX_MODE3) /* (G15) mmc0_dat1.uart3_rxd */
AM33XX_IOPAD(0x8fc, PIN_OUTPUT | MUX_MODE3) /* (G16) mmc0_dat0.uart3_txd */
>;
};
/* Optional sleep pin settings. Must manually enter values in the below skeleton. */
myuart4_pins_sleep: myuart4_pins_sleep {
pinctrl-single,pins = <
AM33XX_IOPAD(0x8f8, ) /* (G15) mmc0_dat1.uart3_rxd */
AM33XX_IOPAD(0x8fc, ) /* (G16) mmc0_dat0.uart3_txd */
>;
};
myuart5_pins_default: myuart5_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x968, PIN_INPUT | MUX_MODE1) /* (E18) uart0_ctsn.uart4_rxd */
AM33XX_IOPAD(0x96c, PIN_OUTPUT | MUX_MODE1) /* (E17) uart0_rtsn.uart4_txd */
>;
};
/* Optional sleep pin settings. Must manually enter values in the below skeleton. */
myuart5_pins_sleep: myuart5_pins_sleep {
pinctrl-single,pins = <
AM33XX_IOPAD(0x968, ) /* (E18) uart0_ctsn.uart4_rxd */
AM33XX_IOPAD(0x96c, ) /* (E17) uart0_rtsn.uart4_txd */
>;
};
myuart6_pins_default: myuart6_pins_default {
pinctrl-single,pins = <
AM33XX_IOPAD(0x908, PIN_INPUT | MUX_MODE3) /* (H16) gmii1_col.uart5_rxd */
AM33XX_IOPAD(0x918, PIN_OUTPUT | MUX_MODE3) /* (J17) gmii1_rxdv.uart5_txd */
>;
};
/* Optional sleep pin settings. Must manually enter values in the below skeleton. */
myuart6_pins_sleep: myuart6_pins_sleep {
pinctrl-single,pins = <
AM33XX_IOPAD(0x908, ) /* (H16) gmii1_col.uart5_rxd */
AM33XX_IOPAD(0x918, ) /* (J17) gmii1_rxdv.uart5_txd */
>;
};
