Meadow.Linux: Add support for Raspberry Pi 5 pinout #379
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The Raspberry Pi 5 pinout is quite different from the previous versions, so we need to add a new pinout class for it. It use a in house developed silicon for I/O, the RP1 I/O controller. It's comes with a new pinctrl driver that changed the sysfs base from 0 to 53 and the gpiochip bank from gpiochip0 to gpiochip4. However, reusing what we already have from previous versions of Raspberry Pi, we can support this simply by modifying the LinuxFlexiPin to allow changing the SysFsGpio and GpiodChip. Signed-off-by: Matheus Castello <matheus.castello@toradex.com>
| // the sysfs base for the pinctrl-rpi1 is 53 | ||
| // the gpiochip bank for pinctrl-rpi1 on rpi5 is gpiochip4 | ||
| foreach (LinuxFlexiPin pin in this.AllPins) { | ||
| pin.SysFsGpio += 53; |
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hey @bcr , no for libgpiod what's changed is the gpiochip number, but the offset continues the same.
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Just to make sure -- there's an integer property called SysFsGpio that you have added 53 to. There is an additional integer property called GpiodOffset that in the base class has the exact same value as SysFsGpio but is not adjusted here. I do understand that you changed the GpiodChip field also.
| // the sysfs base for the pinctrl-rpi1 is 53 | ||
| // the gpiochip bank for pinctrl-rpi1 on rpi5 is gpiochip4 | ||
| foreach (LinuxFlexiPin pin in this.AllPins) { | ||
| pin.SysFsGpio += 53; |
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hey @bcr , no for libgpiod what's changed is the gpiochip number, but the offset continues the same.
source/implementations/linux/Meadow.Linux/Hardware/Pinouts/RaspberryPi5.cs
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Thanks - this is great, we're in the process of sourcing a Pi5. We'll test and likely merge when it arrives. |
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@adrianstevens, @microhobby - this looks cool, I have a Pi 5 so I'm going to pull this and give it a try. |
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Finally received my Pi 5! I'll start verifying these pinouts |
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I'm attacking this to allow running without different pinouts between Pi3,4 and 5, since the physical mapping remains the same. |
The Raspberry Pi 5 pinout is quite different from the previous versions, so we need to add a new pinout class for it. It use a in house developed silicon for I/O, the RP1 I/O controller. It's comes with a new pinctrl driver that changed the sysfs base from 0 to 53 and the gpiochip bank from gpiochip0 to gpiochip4.
However, reusing what we already have from previous versions of the Raspberry Pi we can support this in a simple way, modifying LinuxFlexiPin to allow changing the SysFsGpio and GpiodChip.