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Date: Wed, 15 Jul 2020 21:06:56 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Mark Brown <broonie@...nel.org> Cc: Frieder Schrempf <frieder.schrempf@...tron.de>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-spi <linux-spi@...r.kernel.org> Subject: Re: [PATCH] spi: spidev: Add compatible for external SPI ports on Kontron boards On Mon, Jul 13, 2020 at 5:11 PM Mark Brown <broonie@...nel.org> wrote: > On Mon, Jul 13, 2020 at 03:19:52PM +0200, Frieder Schrempf wrote: > > I would have expected that there is some kind of existing userspace API to > > load an overlay manually, but it seems like there isn't!? > > > So what's the reasoning behind this? How can I solve this in a > > mainline-compliant way, meaning without either keeping downstream patches to > > bind spidev to my device or writing and maintaining code that does the > > overlay loading? > > Basically the reasoning is that nobody's done it rather than any grand Nah, it's been done, but a bit unsafe, if you don't know what you're doing ("with great power come great responsibilities"). Please check out https://elinux.org/R-Car/DT-Overlays I do my best to keep topic/overlays branch up-to-date, and working. > design not to do it. There's some issues for more complex connectors > present on multiple boards with mapping the same connector onto multiple > boards where a resource on the connector might be provided by different > things on the base board so it's not quite as trivial for them as it > should be. There's a big list of issues at https://elinux.org/Frank%27s_Evolving_Overlay_Thoughts In other words: more work to be done, to polish it, and make it safe(r). Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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