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https://git.code.sf.net/p/openocd/code
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5284a5f3ec
Previously, Linux assigned gpiochip numbers sequentially depending on when the chip driver was probed. As RP1 is on the end of a PCIe link, it is probed later than the on-board chips (including expanders connected over SPI/I2C). This meant that RP1's gpiochip assignment was at an offset that could potentially change. A downstream kernel patch now assigns fixed offsets for RP1 and the onboard gpiochips. Query the device tree to get proper GPIO_CHIP index. Change-Id: I759978d4b3021c815a7d9febb41961cd1d3d185c Signed-off-by: Tomas Vanek <vanekt@fbl.cz> Reviewed-on: https://review.openocd.org/c/openocd/+/8650 Reviewed-by: Jonathan Bell <jonathan@raspberrypi.com> Tested-by: jenkins
37 lines
1.1 KiB
INI
37 lines
1.1 KiB
INI
# SPDX-License-Identifier: GPL-2.0-or-later
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# Config for Raspberry Pi 5 used as a bitbang adapter.
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# https://www.raspberrypi.com/documentation/computers/raspberry-pi.html
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# Raspberry Pi 5 is not compatible with bcm2835gpio native GPIO driver.
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# The linuxgpiod driver without configurable adapter speed runs at approximately
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# 800 kHz (SWD writes) and 360 kHz (SWD reads)
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adapter driver linuxgpiod
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proc read_file { name } {
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if {[catch {open $name r} fd]} {
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return ""
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}
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set result [read $fd]
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close $fd
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return $result
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}
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proc find_rp1_alias {} {
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foreach f [glob -directory "/proc/device-tree/aliases" "gpio\[0-9\]"] {
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if {[string match "*/rp1/*" [read_file $f]]} {
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return $f
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}
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}
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}
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set pcie_aspm [read_file /sys/module/pcie_aspm/parameters/policy]
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if {![string match {*\[performance\]*} $pcie_aspm]} {
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echo "Warn : Switch PCIe power saving off or the first couple of pulses gets clocked as fast as 20 MHz"
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echo "Warn : Issue 'echo performance | sudo tee /sys/module/pcie_aspm/parameters/policy'"
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}
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set GPIO_CHIP [string index [find_rp1_alias] end]
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source [find interface/raspberrypi-gpio-connector.cfg]
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