linux-kernel - Re: [PATCH 2/8] pch_uart: Add uart_clk selection for the MinnowBoard

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Date:	Tue, 25 Jun 2013 19:31:43 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Darren Hart <dvhart@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, peter.p.waskiewicz.jr@...el.com,
	andriy.shevchenko@...ux.intel.com, danders@...cuitco.com,
	vishal.l.verma@...el.com, Jiri Slaby <jslaby@...e.cz>,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/8] pch_uart: Add uart_clk selection for the MinnowBoard

On Tue, Jun 25, 2013 at 06:53:22PM -0700, Darren Hart wrote:
> Use DMI_BOARD_NAME to determine if we are running on a MinnowBoard and
> set the uart clock to 50MHz if so. This removes the need to pass the
> user_uartclk to the kernel at boot time.
> 
> Signed-off-by: Darren Hart <dvhart@...ux.intel.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Jiri Slaby <jslaby@...e.cz>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Peter Waskiewicz <peter.p.waskiewicz.jr@...el.com>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: linux-serial@...r.kernel.org
> ---
>  drivers/tty/serial/pch_uart.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
> index 21a7e17..572d481 100644
> --- a/drivers/tty/serial/pch_uart.c
> +++ b/drivers/tty/serial/pch_uart.c
> @@ -217,6 +217,7 @@ enum {
>  #define FRI2_64_UARTCLK  64000000 /*  64.0000 MHz */
>  #define FRI2_48_UARTCLK  48000000 /*  48.0000 MHz */
>  #define NTC1_UARTCLK     64000000 /*  64.0000 MHz */
> +#define MINNOW_UARTCLK   50000000 /*  50.0000 MHz */
>  
>  struct pch_uart_buffer {
>  	unsigned char *buf;
> @@ -398,6 +399,10 @@ static int pch_uart_get_uartclk(void)
>  		    strstr(cmp, "nanoETXexpress-TT")))
>  		return NTC1_UARTCLK;
>  
> +	cmp = dmi_get_system_info(DMI_BOARD_NAME);
> +	if (cmp && strstr(cmp, "MinnowBoard"))
> +		return MINNOW_UARTCLK;
> +

You know, we do have the DMI interface to handle this in a much nicer
way instead of just randomly trying different strings over and over
until we find one that matches...

greg k-h
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