ok that works I'll use the dtb-rebuilder.
I'm comparing against the BBB schematic for the pin numbers and need to
understand how they are mapping to the pinmux pins in
src/arm/am335x-bone-common.dtsi.
For example, which BBB schematic pins are P9.19 and P2.20 on the BBB
schematic since I need to check for any conflicts on our board for
pinmuxing. I don't see a gpio9-19 or a gpio9-20 on the BBB rev-c schematic.
I'm looking at document 450-5500-001 Rev C March 21, 2014.
config-pin P9.19 can
config-pin P9.20 can
+ cape-universal {
+ compatible = "gpio-of-helper";
+ status = "okay";
+ pinctrl-names = "default";
+ pinctrl-0 = <>;
+
+ P9_19 {
+ gpio-name = "P9_19";
+ gpio = <&gpio0 13 0>;
+ input;
+ dir-changeable;
+ };
+
+ P9_20 {
+ gpio-name = "P9_20";
+ gpio = <&gpio0 12 0>;
+ input;
+ dir-changeable;
+ };
+
+ };
On Monday, October 30, 2017 at 4:31:38 PM UTC-5, RobertCNelson wrote:
>
> On Mon, Oct 30, 2017 at 3:39 PM, Tracy Smith <[email protected]
> <javascript:>> wrote:
> > Thanks Robert this is great! Please let me know how it goes. I need to
> > pinmux different pins D18/D17 and E17/E18 for CAN1 and CAN2. The CAN
> pins
> > are used for UART or other. What is the pinmuxing file that should be
> > modified for this?
> >
> > config-pin P9.24 can
> > config-pin P9.26 can
>
> Using the "latest" kernel builds from this last weekend..
>
> 4.4.91-ti-r135/4.4.91-ti-rt-r135
> 4.9.59-ti-r73/4.9.59-ti-rt-r73
> 4.14.0-rc7-ti-r6
>
> 4.13.10-bone3/4.13.10-bone-rt-r3
>
> Now support
>
> config-pin P9.19 can
> config-pin P9.20 can
>
>
> On startup:
>
>
> https://github.com/adafruit/adafruit-beaglebone-io-python/blob/master/doc/run_config-pin_during_startup.md
>
>
> you can do:
>
> #!/bin/bash
>
> config-pin P9.19 can
> config-pin P9.20 can
>
> config-pin P9.24 can
> config-pin P9.26 can
>
>
> > I need to have everything in a build for a release and not only enabling
> CAN
> > on an existing boot. So, any script based mods pulled from repos on a
> > booted system, I need to add to the appropriate files for that release.
> The
> > pinmux in particular for the kernel. What is equivalent to the uboot
> pinmux
> > file for the 4.14 kernel?
>
> So the other option, just hard code the can nodes, using dtb-rebuilder:
>
> https://github.com/RobertCNelson/dtb-rebuilder
>
> (pick a branch that matches your kernel)
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
--
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