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tcl/interface: Find proper alias for RP1 on Raspberry Pi 5 

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
This commit is contained in:
Tomas Vanek 2024-10-25 17:17:22 +02:00
parent 15d90dd21c
commit 5284a5f3ec
1 changed files with 9 additions and 1 deletions
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10
tcl/interface/raspberrypi5-gpiod.cfg
View File

@ -18,11 +18,19 @@ proc read_file { name } {
return $result
}
proc find_rp1_alias {} {
foreach f [glob -directory "/proc/device-tree/aliases" "gpio\[0-9\]"] {
if {[string match "*/rp1/*" [read_file $f]]} {
return $f
}
}
}
set pcie_aspm [read_file /sys/module/pcie_aspm/parameters/policy]
if {![string match {*\[performance\]*} $pcie_aspm]} {
echo "Warn : Switch PCIe power saving off or the first couple of pulses gets clocked as fast as 20 MHz"
echo "Warn : Issue 'echo performance | sudo tee /sys/module/pcie_aspm/parameters/policy'"
}
set GPIO_CHIP 4
set GPIO_CHIP [string index [find_rp1_alias] end]
source [find interface/raspberrypi-gpio-connector.cfg]