linux-kernel - Re: [PATCH v2 1/1] serial: 8250_of: Drop quirk fot NPCM from 8250

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Date: Thu, 15 Feb 2024 18:40:15 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    LKML <linux-kernel@...r.kernel.org>, 
    linux-serial <linux-serial@...r.kernel.org>, 
    Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v2 1/1] serial: 8250_of: Drop quirk fot NPCM from
 8250_port

On Thu, 15 Feb 2024, Andy Shevchenko wrote:

> We are not supposed to spread quirks in 8250_port module especially
> when we have a separate driver for the hardware in question.
> 
> Move quirk from generic module to the driver that uses it.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v2: added missing bits.h, reworked error handling in a switch-case
>  drivers/tty/serial/8250/8250_of.c   | 44 +++++++++++++++++++++++++++--
>  drivers/tty/serial/8250/8250_port.c | 24 ----------------
>  2 files changed, 42 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
> index 34f17a9785e7..9dcc17e33269 100644
> --- a/drivers/tty/serial/8250/8250_of.c
> +++ b/drivers/tty/serial/8250/8250_of.c
> @@ -4,7 +4,10 @@
>   *
>   *    Copyright (C) 2006 Arnd Bergmann <arnd@...db.de>, IBM Corp.
>   */
> +
> +#include <linux/bits.h>
>  #include <linux/console.h>
> +#include <linux/math.h>
>  #include <linux/module.h>
>  #include <linux/slab.h>
>  #include <linux/serial_core.h>
> @@ -25,6 +28,36 @@ struct of_serial_info {
>  	int line;
>  };
>  
> +/* Nuvoton NPCM timeout register */
> +#define UART_NPCM_TOR          7
> +#define UART_NPCM_TOIE         BIT(7)  /* Timeout Interrupt Enable */
> +
> +static int npcm_startup(struct uart_port *port)
> +{
> +	/*
> +	 * Nuvoton calls the scratch register 'UART_TOR' (timeout
> +	 * register). Enable it, and set TIOC (timeout interrupt
> +	 * comparator) to be 0x20 for correct operation.
> +	 */
> +	serial_port_out(port, UART_NPCM_TOR, UART_NPCM_TOIE | 0x20);
> +
> +	return serial8250_do_startup(port);

I know this matches how it is currently done but I wonder if TOIE 
should not be enabled until ->setup_irq() has been called.

-- 
 i.