linux-kernel - Re: [PATCH] tty/serial/imx.c: Rename URTX0 to UTXD0

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Date:   Fri, 22 Feb 2019 21:55:20 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Christina Quast <cquast@...overdisplays.com>
Cc:     linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        jslaby@...e.com, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH] tty/serial/imx.c: Rename URTX0 to UTXD0

On Fri, Feb 22, 2019 at 04:31:27PM +0000, Christina Quast wrote:
> Rename to be coherent with the datasheet.
> 
> Signed-off-by: Christina Quast <cquast@...overdisplays.com>
> ---
>  drivers/tty/serial/imx.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index dff75dc94731..a405e0d21ec9 100644
> --- a/drivers/tty/serial/imx.c
> +++ b/drivers/tty/serial/imx.c
> @@ -40,7 +40,7 @@
>  
>  /* Register definitions */
>  #define URXD0 0x0  /* Receiver Register */
> -#define URTX0 0x40 /* Transmitter Register */
> +#define UTXD0 0x40 /* Transmitter Register */

Oh wow, I never noticed this and it was wrong ever since the kernel is
tracked in git (back in 1da177e4c3f4 the definition was in
include/asm-arm/arch-imx/imx-regs.h)---I didn't check further.

Also I checked the i.MX1, i.MX25 and i.MX6 manuals and the transmit
register was never called RTX, in all three manuals it is named UTXD.

I suggest to also drop the 0 from both URXD0 and UTXD0.

If you send a v2 I recommend adding the imx people (from MAINTAINERS) to
Cc.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |