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4.63) (envelope-from ) id 1jy91N-0004Tc-RZ; Wed, 22 Jul 2020 00:18:34 -0700 Subject: Re: [PATCH] tty: xilinx_uartps: Really fix id assignment To: Maarten Brock , Helmut Grohne Cc: Michal Simek , Greg Kroah-Hartman , Jiri Slaby , Shubhrajyoti Datta , Jan Kiszka , linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-serial-owner@vger.kernel.org References: <20200709074849.GA28968@laureti-dev> <20200713071123.GA1994@laureti-dev> <20200713121019.GA6920@laureti-dev> <2db78149ae9ffb205f02ca4919b50d88@vanmierlo.com> From: Michal Simek Autocrypt: addr=michals@xilinx.com; keydata= xsFNBFFuvDEBEAC9Amu3nk79+J+4xBOuM5XmDmljuukOc6mKB5bBYOa4SrWJZTjeGRf52VMc howHe8Y9nSbG92obZMqsdt+d/hmRu3fgwRYiiU97YJjUkCN5paHXyBb+3IdrLNGt8I7C9RMy svSoH4WcApYNqvB3rcMtJIna+HUhx8xOk+XCfyKJDnrSuKgx0Svj446qgM5fe7RyFOlGX/wF Ae63Hs0RkFo3I/+hLLJP6kwPnOEo3lkvzm3FMMy0D9VxT9e6Y3afe1UTQuhkg8PbABxhowzj SEnl0ICoqpBqqROV/w1fOlPrm4WSNlZJunYV4gTEustZf8j9FWncn3QzRhnQOSuzTPFbsbH5 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X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR02MB5284 Sender: linux-serial-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org On 13. 07. 20 18:08, Maarten Brock wrote: > On 2020-07-13 14:10, Helmut Grohne wrote: >> Hi Michal, >> >> On Mon, Jul 13, 2020 at 01:49:38PM +0200, Michal Simek wrote: >>> On 13. 07. 20 9:11, Helmut Grohne wrote: >>> > Let me try to enumerate those I know: >>> > >>> > uart0    | uart1    | console | remark >>> > ---------+----------+---------+---------- >>> > serial0  | serial1  | ttyPS0  | regular case >>> > serial0  | serial1  | ttyPS1  | normal assignment, second console >>> > serial1  | serial0  | ttyPS0  | -> Jan Kiszka, broken since revert >>> > disabled | serial0  | ttyPS0  | use only uart1 as serial0 >>> > serial0  | disabled | ttyPS0  | regular case with uart1 disabled >>> > >>> > Out of these, I'm actively using configurations 3 and 4. >>> > >>> > Which of these scenarios do you test already? >>> >>> For above we are missing also others >>> serial1 | serial0 | ttyPS1 >>> disabled| serial1 | ttyPS1 >> >> Is it actually possible to have ttyPS1, but no ttyPS0? I think I tried >> doing that earlier and it resulted in there being ttyPS0, but no ttyPS1. > > What if you also have a 16550 (in the PL) and give it the serial0 alias? > Or a UARTlite? The serialN alias is inappropriate to set the number for > ttyPSn. How are you supposed to create all of ttyPS0, ttyS0 and ttyUL0 > using a single serial0 alias? yes this combination is not possible and I don't think this is xilinx specific issue. I expect the same problem you have with ttyAMA, ttyS and others. >>> serial1 | disables | ttyPS0 >> >> I'm not sure what this is supposed to mean. When there is no serial0 >> alias, I'd expect ttyPS0 to be missing. However as indicated above that >> is not what happens in practice. So either of these two configurations >> seems invalid to me. >> >>> All of these above are just not setting any console= on bootargs. >> >> We usually set the console= assignment on bootargs. >> >>> It means mix of these combinations is tested regularly but not all of >>> them. Do you see any other combination which is not supported? >> >> I'm not aware of further relevant combinations. >> >> Can we maybe trim down the matrix somehow? In my context, the need for >> swapping the serial aliases arises from a limitation in u-boot-xlnx and >> the desire to use one dtb for both linux and u-boot. It requires that >> the serial0 alias is the console. Are there other reasons to swap them? >> If not, maybe fixing u-boot would be an option? >> >> Helmut > > I think that it would be better if u-boot used a "console" alias. console is defined in bootargs which is OS specific feature. U-Boot has no idea what ttyPS, ttyS, etc means. That's why I don't think there is something wrong in this in u-boot. But please elaborate more on this because I am not aware about any issue on u-boot configuration. Thanks, Michal