#linux-rockchip on 2020-06-04 — irc logs at freenode.irclog.whitequark.org

2017-05-08 04:47 ChanServ changed the topic of #linux-rockchip to: Rockchip development discussion | IRC log http://irclog.whitequark.org/linux-rockchip | Community GH https://github.com/linux-rockchip | Rockchip GH https://github.com/rockchip-linux | ML https://groups.google.com/group/linux-rockchip

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15:33 <DuClare_> Argh chip select madness..

15:34 <DuClare_> Is a device suppsed to call spi_setup() if it's already been configured via dts?

15:35 <DuClare_> I ran into a stupid thing with spi-gpio

15:36 <DuClare_> I have my chip selects active_low, as usual

15:37 <DuClare_> Apparently spi.c thinks it's appropriate to set SPI_CS_HIGH flag because we have gpiods and gpiolib is supposed to do the inversion for us

15:37 <DuClare_> And there seems to be some logic that relies on such double inversion..

15:37 <DuClare_> All good, so my spi device is setup with cs_high

15:38 <DuClare_> .. then the device's driver sets mode and calls spi_setup() again

15:38 <DuClare_> Setting mode means we just lost the cs_high flag

15:38 <DuClare_> So now the double inversion logic is broken because gpiolib will invert

15:38 <DuClare_> But spi.c does not invert

15:39 <DuClare_> End result: chip select always works as if it were active_high

15:42 <DuClare_> There's a comment in spi.c/spi_add_device "Drivers may modify this initial i/o setup, but will normally rely on the device being set up."

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