Messages in this thread | | | Subject | Re: [PATCH] spi: spidev: Add compatible for external SPI ports on Kontron boards | From | Frieder Schrempf <> | Date | Thu, 2 Jul 2020 18:04:05 +0200 |
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Hi Geert,
On 02.07.20 16:57, Geert Uytterhoeven wrote: > Hi Frieder, > > On Thu, Jul 2, 2020 at 4:46 PM Frieder Schrempf > <frieder.schrempf@kontron.de> wrote: >> On 02.07.20 16:25, Mark Brown wrote: >>> On Thu, Jul 02, 2020 at 04:18:46PM +0200, Schrempf Frieder wrote: >>>> From: Frieder Schrempf <frieder.schrempf@kontron.de> >>>> >>>> Allow external SPI ports on Kontron boards to use the spidev driver. >>> >>> I'd have expected this to require loading a DT overlay for whatever's >>> attached? >> >> My intention is to use the spidev driver in the default board DT for an >> interface that is routed to an extension connector and has no dedicated >> slave device attached onboard. So users can attach sensors, etc. with >> userspace drivers without touching the kernel or DT. >> >> See https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.kernel.org%2Fpatch%2F11639075%2F&data=02%7C01%7Cfrieder.schrempf%40kontron.de%7C5ca9f0ba0ccb4ab0329f08d81e983d4e%7C8c9d3c973fd941c8a2b1646f3942daf1%7C0%7C0%7C637292987071583819&sdata=M8y9HYICQLocSgRmak6uYsx9Y%2FoukaqgmK2D0F%2FTV98%3D&reserved=0 for the boards DT. > > You can bind "kontron,user-spi" devices to spidev from userspace: > [PATCH v2 0/3] device tree spidev solution - driver_override for SPI > https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fspinics.net%2Flists%2Flinux-spi%2Fmsg13951.html&data=02%7C01%7Cfrieder.schrempf%40kontron.de%7C5ca9f0ba0ccb4ab0329f08d81e983d4e%7C8c9d3c973fd941c8a2b1646f3942daf1%7C0%7C0%7C637292987071583819&sdata=D9pum1oTXWSt%2BY8Egb1J4DOgSa5KH3RwxsSmUl7LgUk%3D&reserved=0
Thanks for pointing that out. I didn't know that this is possible. I just tried like below it and it works like a charm:
> echo "spidev" > /sys/devices/platform/soc@0/30800000.bus/30840000.spi/spi_master/spi2/spi2.0/driver_override > echo "spi2.0" > /sys/bus/spi/drivers/spidev/bind
Thanks, Frieder
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