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Orange Pi Pc Plus / Enable Uart


Joks
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Hi,

 

I have a orange pi pc plus, and i want to use a PN532 NFC module with Uart.

 

At first, i need to enable uart and i have found this docs : https://docs.armbian.com/Hardware_Allwinner/ , but i think i miss something.

 

My kernel version is 4.9.0, so i follow Vanilla kernel (Device Tree) explanations. 

What i understand is i need to modify "sun8i-h3-orangepi-pc-plus.dtb"  in /boot/dtb.

I try to do it, but i surely do something wrong, because my pi didn't boot anymore, so i flash the sd card.

 

Before remaking any modification i prefer to be certain, do i really need to modify this files? And in particular this lines?

 

/*Part of the files (Uart0 and Uart1) without any changes*/

 

serial@01c28000 {
compatible = "snps,dw-apb-uart";
reg = <0x1c28000 0x400>;
interrupts = <0x0 0x0 0x4>;
reg-shift = <0x2>;
reg-io-width = <0x4>;
clocks = <0x5 0x3e>;
resets = <0x5 0x31>;
dmas = <0xe 0x6 0xe 0x6>;
dma-names = "rx", "tx";
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <0xf>;
linux,phandle = <0x33>;
phandle = <0x33>;
};
--
serial@01c28400 {
compatible = "snps,dw-apb-uart";
reg = <0x1c28400 0x400>;
interrupts = <0x0 0x1 0x4>;
reg-shift = <0x2>;
reg-io-width = <0x4>;
clocks = <0x5 0x3f>;
resets = <0x5 0x32>;
dmas = <0xe 0x7 0xe 0x7>;
dma-names = "rx", "tx";
status = "disabled";                    /*Line i have modify in my first try, "disabled" to "okay"*/
pinctrl-names = "default";
pinctrl-0 = <0x10>;
linux,phandle = <0x34>;
phandle = <0x34>;
};
 
Thanks,
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[sOLVED]

 

Hi,

 

I just solved my problem(try to enable uart for ttyS3) line i have modified was the good one:

serial@01c28c00 {
compatible = "snps,dw-apb-uart";
reg = <0x1c28c00 0x400>;
interrupts = <0x0 0x3 0x4>;
reg-shift = <0x2>;
reg-io-width = <0x4>;
clocks = <0x5 0x41>;
resets = <0x5 0x34>;
dmas = <0xf 0x9 0xf 0x9>;
dma-names = "rx", "tx";
status = "okay";                                                                  /*"Disabled" to "okay"*/
pinctrl-names = "default";
pinctrl-0 = <0x13>;
linux,phandle = <0x36>;
phandle = <0x36>;
};

but defaults pins of "sun8i-h3-orangepi-pc.dts" wasn't:

root@orangepipc:/boot/dtb# cat sun8i-h3-orangepi-pc.dts | grep uart3 -A -6
uart3 {
allwinner,pins = "PG13", "PG14";
allwinner, function = "uart3";
allwinner,drive = <0x0>; 
allwinner,pull = <0x0>;
linux,phandle = <0x12>;
phandle = <0x12>;
}; 

This is the original file, i change "PG13" to "PA13" and "PG14" to "PA14" and its works perfectly.

 

Hope this will help.

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