Hi Florian. What is it you're asking for from me? Does apica-unix need to be bumped?
> On Jan 13, 2023, at 5:41 AM, Florian Eckert <f...@dev.tdt.de> wrote: > > Hello, > > I have an APU3. This has an I2C bus (SMBUS) to which additional devices can > be connected. On my APU3 board, an IO expander mcp23s08 [1] is connected > there. > This IO expander provides additional GPIOs. This additional GPIOs are > connected to LEDs. The whole thing worked until kernel version 5.4 of > OpenWrt. But after updating to OpenWrt kernel version 5.10 (openwrt-22.03). I > have made the additional LEDs known to the system via a platform driver, > which then integrates these LEDs. The support for reading out the platform > driver data for the driver mcp23s08 has been removed in the kernel with the > commit [2]. I was unable to compile my platform device driver against kernel > 5.10, because of the removed platform data support of the mcp23s08. I > contacted the kernel developer Andy Shevchenko [3] who made this change. His > suggestion was, that the data should be made known to the system via an > additional SSDT table via ACPI [4]. Then everything should work like a system > that supports device-tree. I have now played around with SSDT a bit and > finally managed to get the driver responsible again for this device. I had to > create a new SSDT file and com pile it with a program from the acpica-unix package [5]. The file must be moved into an initrd, so this could be read by the kernel during boot. > > Now to my question: > In order to load this new SSDT file, it must be made available to the kernel > via an initrd. > However, initrd handling is currently not supported by OpenWrt. Manually, it > is no problem for me to load the GRUB initrd. > But I would like to have a solution that is generally valid in OpenWrt during > image generation. I have already prepared a pullrequest for openwrt [6] on my > fork with the changes that are needed. But I am not sure if this is the right > solution. > Additional the acpica-unix package from the package feed [7] must also be > build for the host, to compile the acpi asl source file into acpi aml files. > > > Kind regards > > Florian > > [1] https://github.com/torvalds/linux/blob/master/drivers/pinctrl/Kconfig#L305 > [2] > https://github.com/torvalds/linux/commit/6aba6ed879b3471903c8ada28ba968a268df6143 > [3] https://github.com/andy-shev > [4] https://lore.kernel.org/all/290741faab199d3e43b6255bf2282...@dev.tdt.de/ > [5] https://www.acpica.org/documentation > [6] https://github.com/TDT-AG/openwrt/tree/pr/20230110-config-kernel > [7] https://github.com/openwrt/packages/blob/master/utils/acpica-unix/Makefile _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
