On Tue, Jul 19, 2016 at 12:27:54PM -0700, Brian Norris wrote: > + Rob + Rob for real > Hi, > > On Tue, Jul 19, 2016 at 08:56:47PM +0200, Heiko Stuebner wrote: > > Am Dienstag, 19. Juli 2016, 08:39:55 schrieb Uwe Kleine-König: > > > On Thu, Jul 14, 2016 at 06:24:33PM -0700, Brian Norris wrote: > > > > It's nicer to see this: > > > > # ls -l /sys/bus/spi/devices/ > > > > total 0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi0.0 -> > > > > ../../../devices/platform/ff1c0000.spi/spi_master/spi0/spi0.0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi1.0 -> > > > > ../../../devices/platform/ff1d0000.spi/spi_master/spi1/spi1.0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi2.0 -> > > > > ../../../devices/platform/ff1e0000.spi/spi_master/spi2/spi2.0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi5.0 -> > > > > ../../../devices/platform/ff200000.spi/spi_master/spi5/spi5.0> > > > > than this: > > > > # ls -l /sys/bus/spi/devices/ > > > > total 0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi32763.0 -> > > > > ../../../devices/platform/ff200000.spi/spi_master/spi32763/spi32763.0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi32764.0 -> > > > > ../../../devices/platform/ff1e0000.spi/spi_master/spi32764/spi32764.0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi32765.0 -> > > > > ../../../devices/platform/ff1d0000.spi/spi_master/spi32765/spi32765.0 > > > > lrwxrwxrwx 1 root root 0 Dec 31 1969 spi32766.0 -> > > > > ../../../devices/platform/ff1c0000.spi/spi_master/spi32766/spi32766.0> > > > > With the latter, it's much clearer which bus devices are on. > > > > > > > > Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx> > > > > --- > > > > > > > > arch/arm64/boot/dts/rockchip/rk3399.dtsi | 6 ++++++ > > > > 1 file changed, 6 insertions(+) > > > > > > > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi > > > > b/arch/arm64/boot/dts/rockchip/rk3399.dtsi index > > > > 4c84229789ef..b04abbfd4898 100644 > > > > --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi > > > > +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi > > > > @@ -70,6 +70,12 @@ > > > > > > > > serial2 = &uart2; > > > > serial3 = &uart3; > > > > serial4 = &uart4; > > > > > > > > + spi0 = &spi0; > > > > + spi1 = &spi1; > > > > + spi2 = &spi2; > > > > + spi3 = &spi3; > > > > + spi4 = &spi4; > > > > + spi5 = &spi5; > > > > > > Note that Rob Herring (with his dt-maintainer hat on) doesn't like these > > > aliases. > > > See for example: > > > http://mid.gmane.org/20160705140546.GA10601@rob-hp-laptop > > But why? I believe half the arguments in the linked thread were > Catch-22's -- there were no "mainline" users (which is a false target > IMO anyway, as Christer Weinigel mentioned somewhere in the thread Rob > linked), and so we couldn't accept more documentation (or users) for the > feature. FWIW, my quick grep now shows there are currently 43 mainline > users. > > This feature is very useful. Some of the thread Rob pointed to argued > that the indexing isn't HW documentation; in this case, it most > certainly is. The RK3399 TRM explicitly has these SPI buses named SPI0, > SPI1, SPI2, SPI3, SPI4, and SPI5, and schematics that I've seen use the > same terminology. It is therefore *much* nicer to have my device show up > as 'spi2.0' (reflecting their correct HW name) rather than spi32764.0. > Sometimes I can't even get as far as mounting sysfs to check what this > maps to, but having spi2.0 in the kernel log can clearly tell me what > device is causing problems. > > If Rob can support a better alternative solution, I'd be happy to > switch. But I don't understand why we can't use a useful (not just to > me, but presumably to at least 43 other independent users, and many > more out of tree), existing, and long-supported feature here. > > > thanks for the heads up on this. I've dropped this patch again. > > :( > > Regards, > Brian -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
