From: Helmut Grohne <helmut.grohne@intenta.de> To: Michal Simek <michal.simek@xilinx.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>, "Jan Kiszka" <jan.kiszka@web.de>, <linux-serial@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH] tty: xilinx_uartps: Really fix id assignment Date: Mon, 13 Jul 2020 14:10:19 +0200 [thread overview] Message-ID: <20200713121019.GA6920@laureti-dev> (raw) In-Reply-To: <e7b766ab-8c99-d30c-2352-6d7b09033537@xilinx.com> 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. > 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
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From: Helmut Grohne <helmut.grohne@intenta.de> To: Michal Simek <michal.simek@xilinx.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>, Jan Kiszka <jan.kiszka@web.de>, linux-serial@vger.kernel.org, Jiri Slaby <jslaby@suse.com>, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH] tty: xilinx_uartps: Really fix id assignment Date: Mon, 13 Jul 2020 14:10:19 +0200 [thread overview] Message-ID: <20200713121019.GA6920@laureti-dev> (raw) In-Reply-To: <e7b766ab-8c99-d30c-2352-6d7b09033537@xilinx.com> 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. > 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-07-13 12:10 UTC|newest] Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-18 8:11 [PATCH] Revert "tty: xilinx_uartps: Fix missing id assignment to the console" Jan Kiszka 2020-06-18 8:11 ` Jan Kiszka 2020-06-18 8:17 ` Michal Simek 2020-06-18 8:17 ` Michal Simek 2020-07-09 7:48 ` [PATCH] tty: xilinx_uartps: Really fix id assignment Helmut Grohne 2020-07-09 7:48 ` Helmut Grohne 2020-07-10 11:45 ` Michal Simek 2020-07-10 11:45 ` Michal Simek 2020-07-13 7:11 ` Helmut Grohne 2020-07-13 7:11 ` Helmut Grohne 2020-07-13 11:49 ` Michal Simek 2020-07-13 11:49 ` Michal Simek 2020-07-13 12:10 ` Helmut Grohne [this message] 2020-07-13 12:10 ` Helmut Grohne 2020-07-13 16:08 ` Maarten Brock 2020-07-13 16:08 ` Maarten Brock 2020-07-22 7:18 ` Michal Simek 2020-07-22 7:18 ` Michal Simek 2020-07-22 16:50 ` Maarten Brock 2020-07-22 16:50 ` Maarten Brock 2020-07-24 9:19 ` Michal Simek 2020-07-24 9:19 ` Michal Simek 2020-07-22 7:14 ` Michal Simek 2020-07-23 9:50 ` Helmut Grohne 2020-07-23 9:50 ` Helmut Grohne 2020-07-24 8:43 ` Michal Simek 2020-07-24 8:43 ` Michal Simek 2020-07-10 12:45 ` Greg Kroah-Hartman 2020-07-10 12:45 ` Greg Kroah-Hartman 2020-07-13 7:32 ` [PATCH v2] " Helmut Grohne 2020-07-13 7:32 ` Helmut Grohne
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