On Tue, Jul 30, 2019 at 9:29 PM Gedare Bloom <ged...@rtems.org> wrote:
> On Tue, Jul 30, 2019 at 12:40 AM Christian Mauderer > <christian.maude...@embedded-brains.de> wrote: > > > > On 29/07/2019 22:11, Gedare Bloom wrote: > > > We had a GSoC project about GPIO API implemented for RPi. > > > > > > https://devel.rtems.org/wiki/GSoC/2013/Raspberry_Pi_BSP_Peripherals > > > > Hello Gedare, > > > > thanks for the hint. It seems that someone used at least the > > <bsp/gpio.h> for BBB too (in bsps/arm/beagle/gpio/bbb-gpio.c). But it > > seems that RPi and BBB are the only BSPs using the API. > > > > So it would be necessary to find out in what state the API is (is it > > general enough to theoretically support every BSP; is the support in BBB > > in a usable state) and if yes it would be worth to implement a fdt GPIO > > initialization based on that API. > > > > I'll try to take a look at that in the next few days (most likely more > > toward the weekend). Depending on the amount of work, it could be worth > > to just implement it or put it in a future GSoC project. > > > I'm sure it could be expanded to a full project by trying to > generalize it, and by mapping for example the arduino wiring APIs over > it. > > > Hi, I came up with a hack to allow the pinmuxing of only the HDMI pins. This can be used as a hack for the drivers until we have a clean permanent solution. I wrote an overlay to add a field "rtems-pinctrl-0" in the device tree and parsed this property from the fdt_pinctrl file, instead of the default property name. This enables the initialization of only the tda pins. I have tested this with my sample app and it works properly with the screen. the device tree overlay: https://gist.github.com/thelunatic/dd274cb423ea6d3bfbf4c6b06496126c The diff: ``` diff --git a/freebsd/sys/dev/fdt/fdt_pinctrl.c b/freebsd/sys/dev/fdt/fdt_pinctrl.c index c2e0c612..515325aa 100644 --- a/freebsd/sys/dev/fdt/fdt_pinctrl.c +++ b/freebsd/sys/dev/fdt/fdt_pinctrl.c @@ -131,8 +131,13 @@ pinctrl_configure_children(device_t pinctrl, phandle_t parent) if (!ofw_bus_node_status_okay(node)) continue; pinctrl_configure_children(pinctrl, node); +#ifdef __rtems__ + nconfigs = OF_getencprop_alloc_multi(node, "rtems-pinctrl-0", + sizeof(*configs), (void **)&configs); +#else nconfigs = OF_getencprop_alloc_multi(node, "pinctrl-0", sizeof(*configs), (void **)&configs); +#endif /* __rtems__ */ if (nconfigs <= 0) continue; if (bootverbose) { ```
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