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

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Date:	Wed, 26 Jun 2013 00:19:22 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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, linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/8] pch_uart: Add uart_clk selection for the MinnowBoard

On Wed, 2013-06-26 at 08:43 +0200, Jiri Slaby wrote:
> On 06/26/2013 05:58 AM, Darren Hart wrote:
> > Subject: [PATCH] pch_uart: Use DMI interface for board detection
> > 
> > Use the DMI interface rather than manually matching DMI strings.
> > 
> > Signed-off-by: Darren Hart <dvhart@...ux.intel.com>
> > ---
> >  drivers/tty/serial/pch_uart.c | 71
> > +++++++++++++++++++++++++++++--------------
> >  1 file changed, 49 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/pch_uart.c
> > b/drivers/tty/serial/pch_uart.c
> > index 572d481..271cc73 100644
> > --- a/drivers/tty/serial/pch_uart.c
> > +++ b/drivers/tty/serial/pch_uart.c
> > @@ -373,35 +373,62 @@ static const struct file_operations port_regs_ops
> > = {
> >  };
> >  #endif	/* CONFIG_DEBUG_FS */
> >  
> > +static struct dmi_system_id __initdata pch_uart_dmi_table[] = {
> > +	{
> > +		.ident = "CM-iTC",
> > +		{
> > +			DMI_MATCH(DMI_BOARD_NAME, "CM-iTC"),
> > +		},
> > +		(void *)CMITC_UARTCLK,
> > +	},
> > +	{
> > +		.ident = "FRI2",
> > +		{
> > +			DMI_MATCH(DMI_BIOS_VERSION, "FRI2"),
> > +		},
> > +		(void *)FRI2_64_UARTCLK,
> > +	},
> > +	{
> > +		.ident = "Fish River Island II",
> > +		{
> > +			DMI_MATCH(DMI_PRODUCT_NAME, "Fish River Island II"),
> > +		},
> > +		(void *)FRI2_48_UARTCLK,
> > +	},
> > +	{
> > +		.ident = "COMe-mTT",
> > +		{
> > +			DMI_MATCH(DMI_BOARD_NAME, "COMe-mTT"),
> > +		},
> > +		(void *)NTC1_UARTCLK,
> > +	},
> > +	{
> > +		.ident = "nanoETXexpress-TT",
> > +		{
> > +			DMI_MATCH(DMI_BOARD_NAME, "nanoETXexpress-TT"),
> > +		},
> > +		(void *)NTC1_UARTCLK,
> > +	},
> > +	{
> > +		.ident = "MinnowBoard",
> > +		{
> > +			DMI_MATCH(DMI_BOARD_NAME, "MinnowBoard"),
> > +		},
> > +		(void *)MINNOW_UARTCLK,
> > +	},
> > +};
> > +
> >  /* Return UART clock, checking for board specific clocks. */
> >  static int pch_uart_get_uartclk(void)
> >  {
> > -	const char *cmp;
> > +	const struct dmi_system_id *d;
> >  
> >  	if (user_uartclk)
> >  		return user_uartclk;
> >  
> > -	cmp = dmi_get_system_info(DMI_BOARD_NAME);
> > -	if (cmp && strstr(cmp, "CM-iTC"))
> > -		return CMITC_UARTCLK;
> > -
> > -	cmp = dmi_get_system_info(DMI_BIOS_VERSION);
> > -	if (cmp && strnstr(cmp, "FRI2", 4))
> > -		return FRI2_64_UARTCLK;
> > -
> > -	cmp = dmi_get_system_info(DMI_PRODUCT_NAME);
> > -	if (cmp && strstr(cmp, "Fish River Island II"))
> > -		return FRI2_48_UARTCLK;
> > -
> > -	/* Kontron COMe-mTT10 (nanoETXexpress-TT) */
> > -	cmp = dmi_get_system_info(DMI_BOARD_NAME);
> > -	if (cmp && (strstr(cmp, "COMe-mTT") ||
> > -		    strstr(cmp, "nanoETXexpress-TT")))
> > -		return NTC1_UARTCLK;
> > -
> > -	cmp = dmi_get_system_info(DMI_BOARD_NAME);
> > -	if (cmp && strstr(cmp, "MinnowBoard"))
> > -		return MINNOW_UARTCLK;
> > +	d = dmi_first_match(pch_uart_dmi_table);
> > +	if (d)
> > +		return (int)d->driver_data;
> 
> This and the (void *) casts above will generate a warning on 64bit,
> right? We need to go through long here...
> 

You can't actually use this driver on 64 bit as there is no hardware,
but yes, I can clean that up just on principle. Thank you for pointing
that out.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Technical Lead - Linux Kernel

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