Hi,
Our target board use the 3 uarts.
UART0 : for debug
UART1 : for MODULE1
UART3: for MODULE2
if we open the 2 uarts(uart0 and uart1), uart1 is working.
uart1_pins: pinmux_uart1_pins {
pinctrl-single,pins = <
0x180 ( PIN_INPUT_PULLUP | MUX_MODE0 ) /* (D16) uart1_rxd.uart1_rxd */
0x184 ( PIN_OUTPUT_PULLDOWN | MUX_MODE0 ) /* (D15) uart1_txd.uart1_txd */
0x178 ( PIN_INPUT_PULLUP | MUX_MODE0 ) /* (D18) uart1_ctsn.uart1_ctsn */
0x17c ( PIN_OUTPUT_PULLDOWN | MUX_MODE0 ) /* (D17) uart1_rtsn.uart1_rtsn */
0xf0 ( PIN_INPUT_PULLUP | MUX_MODE4 ) /* (F17) mmc0_dat3.uart1_dcdn */
0xf4 ( PIN_INPUT_PULLUP | MUX_MODE4 ) /* (F18) mmc0_dat2.uart1_dsrn */
0xf8 ( PIN_OUTPUT_PULLDOWN | MUX_MODE4 ) /* (G15) mmc0_dat1.uart1_dtrn */
0xfc ( PIN_INPUT_PULLUP | MUX_MODE4 ) /* (G16) mmc0_dat0.uart1_rin */
>;
};
&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&uart1_pins>;
status = "okay";
};
But if we open the 3 uarts(uart0, uart1 and uart3), then uart1 is not working.
uart1_pins: pinmux_uart1_pins {
pinctrl-single,pins = <
0x180 ( PIN_INPUT_PULLUP | MUX_MODE0 ) /* (D16) uart1_rxd.uart1_rxd */
0x184 ( PIN_OUTPUT_PULLDOWN | MUX_MODE0 ) /* (D15) uart1_txd.uart1_txd */
0x178 ( PIN_INPUT_PULLUP | MUX_MODE0 ) /* (D18) uart1_ctsn.uart1_ctsn */
0x17c ( PIN_OUTPUT_PULLDOWN | MUX_MODE0 ) /* (D17) uart1_rtsn.uart1_rtsn */
0xf0 ( PIN_INPUT_PULLUP | MUX_MODE4 ) /* (F17) mmc0_dat3.uart1_dcdn */
0xf4 ( PIN_INPUT_PULLUP | MUX_MODE4 ) /* (F18) mmc0_dat2.uart1_dsrn */
0xf8 ( PIN_OUTPUT_PULLDOWN | MUX_MODE4 ) /* (G15) mmc0_dat1.uart1_dtrn */
0xfc ( PIN_INPUT_PULLUP | MUX_MODE4 ) /* (G16) mmc0_dat0.uart1_rin */
>;
};
uart3_pins: pinmux_uart1_pins {
pinctrl-single,pins = <
0x160 ( PIN_INPUT_PULLUP | MUX_MODE1 ) /* (C15) spi0_cs1.uart3_rxd */
0x164 ( PIN_OUTPUT_PULLDOWN | MUX_MODE1 ) /* (C18) eCAP0_in_PWM0_out.uart3_txd */
>;
};
&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&uart1_pins>;
status = "okay";
};
&uart3 {
pinctrl-names = "default";
pinctrl-0 = <&uart3_pins>;
status = "okay";
};
Is there a max uart open number restrictions?
My environment:
linux-3.14.26-g2489c02
u-boot-2014.07-g7e537bf
