Date: Wed, 25 Jan 2017 20:29:45 -0700 From: Ian Lepore <ian@freebsd.org> To: Tony Hain <tony@tndh.net>, freebsd-arm@freebsd.org Subject: Re: BBB uarts & pps dts definitions Message-ID: <1485401385.30533.59.camel@freebsd.org> In-Reply-To: <03a801d2776e$cae997e0$60bcc7a0$@tndh.net> References: <03a801d2776e$cae997e0$60bcc7a0$@tndh.net>
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On Wed, 2017-01-25 at 16:54 -0800, Tony Hain wrote:
> Hi,
>
> [...]
>
> I figured it would be simpler to start debugging with the serial port first
> since there was an example for the working console port. My original intent
> was to use uart5 since it was also on P8, but given gpioctl is only listing
> the first 32 I switched to uart1 (P9-26). Simply changing the "disabled" to
> "okay" for the uart was sufficient to make it show up as /dev/ttyu1, but not
> enough to make it work. Taking hints from various dts files for uart1, I
> have:
> uart1_pins: pinmux_uart1_pins {
> pinctrl-single,pins = <0x180 0x020 0x184 0x0>;
> linux,phandle = <0x1>;
> phandle = <0x1>;
> };
> ...
> serial@48022000 {
> compatible = "ti,am3352-uart", "ti,omap3-uart";
> ti,hwmods = "uart2";
> clock-frequency = <0x2dc6c00>;
> reg = <0x48022000 0x2000>;
> interrupts = <0x49>;
> // status = "disabled";
> status = "okay";
> dmas = <0x29 0x1c 0x0 0x29 0x1d 0x0>;
> dma-names = "tx", "rx";
>
> pinctrl-names = "default";
> pinctrl-0 = <&uart1_pins>;
> };
> I am getting a duplication error for the phandle lines. I realize the
> existing devices have unique hex values for those, but the only references
> search is turning up and downloadable dtb files I can find have the phandle
> for that uart as 0x1. Is there a reason that all the uarts are not listed
> with the correct values & commented out in the default DTS? In addition,
> uart4 & 5 don't have the dma lines that the others have ... and those lines
> don't appear in the reference linux dts files so I can't tell what they are
> for. Comments in the dts hinting at where to look for references for other
> values would make it easier to clone a working device for another one.
>
I don't know anything about the dts overlay stuff, I haven't had time
to learn about it yet.
Back when I was first working on the dmtpps driver, before I made it
configure the timer input pin for itself, I was just modifying the main
dts source in sys/gnu/dts/arm/am335x-boneblack.dts to enable uart1 and
timer4 for testing. I'll attach the patch I used to enable them and
configure the pins.
-- Ian
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Index: sys/gnu/dts/arm/am335x-boneblack.dts
===================================================================
--- sys/gnu/dts/arm/am335x-boneblack.dts (revision 312786)
+++ sys/gnu/dts/arm/am335x-boneblack.dts (working copy)
@@ -64,8 +64,33 @@
AM33XX_IOPAD(0x9b0, PIN_OUTPUT_PULLDOWN | MUX_MODE3) /* xdma_event_intr0 */
>;
};
+ uart1_pins: uart1_pins {
+ pinctrl-single,pins = <
+ AM33XX_IOPAD(0x978, PIN_INPUT | MUX_MODE0) /* cts */
+ AM33XX_IOPAD(0x97C, PIN_OUTPUT | MUX_MODE0) /* rts */
+ AM33XX_IOPAD(0x980, PIN_INPUT_PULLUP | MUX_MODE0) /* rxd */
+ AM33XX_IOPAD(0x984, PIN_OUTPUT | MUX_MODE0) /* txd */
+ >;
+ };
+ timer4_pins: timer4_pins {
+ pinctrl-single,pins = <
+ AM33XX_IOPAD(0x890, (PIN_INPUT | MUX_MODE2)) /* timer4 */
+ >;
+ };
};
+&uart1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart1_pins>;
+ status = "okay";
+};
+
+&timer4 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&timer4_pins>;
+ status = "okay";
+};
+
&lcdc {
status = "okay";
port {
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