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

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Date:	Tue, 25 Jun 2013 20:16:18 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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, 2013-06-25 at 19:31 -0700, Greg Kroah-Hartman wrote:
> On Tue, Jun 25, 2013 at 06:53:22PM -0700, Darren Hart wrote:
>   
> >  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...

I was aiming for minimal change. Partly because I'm lazy. Partly
because I don't have all of the impacted hardware to test. Partly
because I wanted to keep it simple so I could push this to 3.8 stable.

I can rewrite this detection to use the DMI interface. Would you allow
it as a follow-on, to keep the changes to stable minimal?

Also, I do have a PCI subsystem ID for this particular board which I
could trigger on, but since that mechanism didn't exist in the driver
already and the other boards don't do it, I just followed what was
already there (yeah, so I wrote most of what was already there...
but.... anyway) :-)

What do you prefer? Rewrite, then add Minnow, or use this, then
rewrite?

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

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