I have a working custom iMX8mm device based on L4.14.98. This custom device uses uart4 muxed to the default ECSPI2 pins. My DTS file looks like:
...
pinctrl_uart2: uart2grp {
fsl,pins = <
MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140
MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140
>;
};
pinctrl_uart4: uart4grp {
fsl,pins = <
MX8MM_IOMUXC_ECSPI2_MOSI_UART4_DCE_TX 0x00000116
MX8MM_IOMUXC_ECSPI2_SCLK_UART4_DCE_RX 0x00001916
MX8MM_IOMUXC_ECSPI2_MISO_UART4_DCE_CTS_B 0x00000116
MX8MM_IOMUXC_ECSPI2_SS0_UART4_DCE_RTS_B 0x00000116
>;
};
...
&uart2 { /* console */
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart2>;
status = "okay";
};
&uart4 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart4>;
assigned-clocks = <&clk IMX8MM_CLK_UART4>;
assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
fsl,uart-has-rtscts;
status = "okay";
};
I am in the process of migrating to L4.19.35 and I noticed the DTS files for the evk are quite different in the way of pin mux/control. My DTS file based on L4.14.98 will not migrate directly to L4.19.35. In deed the u-boot will not even compile.
I fixed most things by basing my new DTS following the L4.19.35 iMX8mm evk pattern but I am stuck with UART4.
#############################################
My new DTS looks like:
pinctrl_uart2: uart1grp {
fsl,pins = <
MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x49
MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x49
>;
};
pinctrl_uart4: uart4grp {
fsl,pins = <
MX8MM_IOMUXC_ECSPI2_MOSI_UART4_DCE_TX 0x?????
MX8MM_IOMUXC_ECSPI2_SCLK_UART4_DCE_RX 0x?????
MX8MM_IOMUXC_ECSPI2_MISO_UART4_DCE_CTS_B 0x????
MX8MM_IOMUXC_ECSPI2_SS0_UART4_DCE_RTS_B 0x?????
>;
};
...
&uart2 { /* console */
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart2>;
status = "okay";
};
&uart4 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart4>;
assigned-clocks = <&clk IMX8MM_CLK_UART4>;
assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
fsl,uart-has-rtscts;
status = "okay";
};
My questions are:
1. why is "pinctrl_uart2: uart1grp" which is in the evk source. Where is uart1grp and shouldn't that be uart2grp?
2. what do I need to put in the ???? for the uart4 iomux?
