> -----Original Message----- > From: Arnd Bergmann [mailto:arnd@xxxxxxxx] > Sent: Monday, August 29, 2016 3:38 PM > To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Cc: Stuart Yoder <stuart.yoder@xxxxxxx>; devicetree@xxxxxxxxxxxxxxx; shawnguo@xxxxxxxxxx > Subject: Re: [PATCH 1/2] arm64: dts: updates serial aliases for ls1043a rdb and qds boards > > On Monday 29 August 2016, Stuart Yoder wrote: > > > -----Original Message----- > > > From: Arnd Bergmann [mailto:arnd@xxxxxxxx] > > > Sent: Monday, August 29, 2016 6:01 AM > > > To: Stuart Yoder <stuart.yoder@xxxxxxx> > > > Cc: devicetree@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; shawnguo@xxxxxxxxxx > > > Subject: Re: [PATCH 1/2] arm64: dts: updates serial aliases for ls1043a rdb and qds boards > > > > > > On Friday, August 26, 2016 3:46:20 PM CEST Stuart Yoder wrote: > > > > - serial0 = &lpuart0; > > > > - serial1 = &lpuart1; > > > > - serial2 = &lpuart2; > > > > - serial3 = &lpuart3; > > > > - serial4 = &lpuart4; > > > > - serial5 = &lpuart5; > > > > + serial0 = &duart0; > > > > + serial1 = &duart1; > > > > + serial2 = &duart2; > > > > + serial3 = &duart3; > > > > > > It looks like your board has six uarts that are all driven with the > > > lpuart driver, but after the change, you only list four. Should > > > the serial4 and serial5 aliases keep pointing at lpuart devices > > > so you can still drive all physical connectors? > > > > The only existing reference I can find to the serial aliases is if the > > OF_STDOUT_VIA_ALIAS is enabled in u-boot to specify the console. The > > standard ls1043aqds_defconfig in u-boot specifies DUARTs for the console, > > which is why I'm proposing making the 4 DUARTs the default serial aliases > > in the device tree. > > Ok, so they are mutually exclusive, and the last two ports are > unavailable in the default configuration? Yes, that's the case with u-boot's defconfig. I'm still trying to find out whether that mutual exlusivity was a firmware decision or a hardware limitation. Stuart -- 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
