Le 24/07/2023 à 08:33, Randy Dunlap a écrit :
> Reconcile devices.txt with serial/ucc_uart.c regarding device number
> assignments. ucc_uart.c supports 4 ports and uses minor devnums
> 46-49, so update devices.txt with that info.
> Then update ucc_uart.c's reference to the location of the devices.txt
> list in the kernel source tree.
Devices ttyCPM* belong to cpm_uart driver. As explained in the comment
you have modified in UCC uart driver, UCC uart borrows those devices and
shall not be considered as the reference. But the lines you modify in
device.txt doesn't mention QE UCC, it mentions CPM SCC and CPM SMC.
CPM uart driver supports up to 6 ports (4 SCC and 2 SMC).
On one of my boards which has a powerpc mpc866 CPU, I have:
[ 2.393872] ff000a80.serial: ttyCPM0 at MMIO 0xfff00a80 (irq = 19,
base_baud = 8250000) is a CPM UART
[ 2.411899] ff000a90.serial: ttyCPM1 at MMIO 0xfff00a90 (irq = 20,
base_baud = 8250000) is a CPM UART
[ 2.430352] ff000a00.serial: ttyCPM2 at MMIO 0xfff00a00 (irq = 30,
base_baud = 8250000) is a CPM UART
[ 2.448944] ff000a20.serial: ttyCPM3 at MMIO 0xfff00a20 (irq = 29,
base_baud = 8250000) is a CPM UART
[ 2.467435] ff000a40.serial: ttyCPM4 at MMIO 0xfff00a40 (irq = 28,
base_baud = 8250000) is a CPM UART
[ 2.485924] ff000a60.serial: ttyCPM5 at MMIO 0xfff00a60 (irq = 27,
base_baud = 8250000) is a CPM UART
# ll /dev/ttyCPM*
crw------- 1 root root 204, 46 Jan 1 01:01 /dev/ttyCPM0
crw------- 1 root root 204, 47 Jan 1 01:00 /dev/ttyCPM1
crw------- 1 root root 204, 48 Jan 1 01:00 /dev/ttyCPM2
crw------- 1 root root 204, 49 Jan 1 01:00 /dev/ttyCPM3
crw------- 1 root root 204, 50 Jan 1 01:00 /dev/ttyCPM4
crw------- 1 root root 204, 51 Jan 1 01:00 /dev/ttyCPM5
# cat /proc/tty/drivers
/dev/tty /dev/tty 5 0 system:/dev/tty
/dev/console /dev/console 5 1 system:console
/dev/ptmx /dev/ptmx 5 2 system
ttyCPM /dev/ttyCPM 204 46-51 serial
pty_slave /dev/pts 136 0-1048575 pty:slave
pty_master /dev/ptm 128 0-1048575 pty:master
pty_slave /dev/ttyp 3 0-4 pty:slave
pty_master /dev/pty 2 0-4 pty:master
Christophe
>
> Fixes: d7584ed2b994 ("[POWERPC] qe-uart: add support for Freescale QUICCEngine UART")
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
> Cc: Timur Tabi <timur@xxxxxxxxxx>
> Cc: Kumar Gala <galak@xxxxxxxxxxxxxxxxxxx>
> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
> Cc: linux-serial@xxxxxxxxxxxxxxx
> Cc: Jonathan Corbet <corbet@xxxxxxx>
> Cc: linux-doc@xxxxxxxxxxxxxxx
> ---
> Documentation/admin-guide/devices.txt | 2 +-
> drivers/tty/serial/ucc_uart.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff -- a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c
> --- a/drivers/tty/serial/ucc_uart.c
> +++ b/drivers/tty/serial/ucc_uart.c
> @@ -59,7 +59,7 @@ static int firmware_loaded;
> /* #define LOOPBACK */
>
> /* The major and minor device numbers are defined in
> - * http://www.lanana.org/docs/device-list/devices-2.6+.txt. For the QE
> + * Documentation/admin-guide/devices.txt. For the QE
> * UART, we have major number 204 and minor numbers 46 - 49, which are the
> * same as for the CPM2. This decision was made because no Freescale part
> * has both a CPM and a QE.
> diff -- a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
> --- a/Documentation/admin-guide/devices.txt
> +++ b/Documentation/admin-guide/devices.txt
> @@ -2691,7 +2691,7 @@
> 45 = /dev/ttyMM1 Marvell MPSC - port 1 (obsolete unused)
> 46 = /dev/ttyCPM0 PPC CPM (SCC or SMC) - port 0
> ...
> - 47 = /dev/ttyCPM5 PPC CPM (SCC or SMC) - port 5
> + 49 = /dev/ttyCPM5 PPC CPM (SCC or SMC) - port 3
> 50 = /dev/ttyIOC0 Altix serial card
> ...
> 81 = /dev/ttyIOC31 Altix serial card
