linux-kernel - Re: [PATCH 06/06] serial8250-em: Add Emma Mobile UART driver

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Date:	Thu, 3 May 2012 08:46:54 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-serial@...r.kernel.org, horms@...ge.net.au,
	linux-sh@...r.kernel.org, swarren@...dotorg.org,
	linux-kernel@...r.kernel.org, rjw@...k.pl, lethal@...ux-sh.org,
	olof@...om.net, dan.j.williams@...el.com, alan@...ux.intel.com
Subject: Re: [PATCH 06/06] serial8250-em: Add Emma Mobile UART driver

On Wednesday 02 May 2012, Greg KH wrote:
> > > +
> > > +config SERIAL_8250_EM
> > > +   tristate "Support for Emma Mobile intergrated serial port"
> > > +   depends on SERIAL_8250
> > 
> > Should we depend on arch=ARM or something similar?  Even if the
> > driver is written to be arch independent, if the Emma itself is
> > physically tied to ARM platforms, we probably don't need to be
> > building it for sparc allyesconfig etc.
> 
> Yeah, it doesn't build on x86-64, I get the following build problems:
>         ERROR: "clk_get_rate" [drivers/tty/serial/8250/8250_em.ko] undefined!
>         ERROR: "clk_enable" [drivers/tty/serial/8250/8250_em.ko] undefined!
>         ERROR: "clk_get" [drivers/tty/serial/8250/8250_em.ko] undefined!
>         ERROR: "clk_put" [drivers/tty/serial/8250/8250_em.ko] undefined!
>         ERROR: "clk_disable" [drivers/tty/serial/8250/8250_em.ko] undefined!
> 
> So it should depend on some arch that has clk at the least.
> 
> Magnus, care to redo just this one patch that fixes this up?  I've
> applied the first 5 already.

I think it's best to make it depend on HAVE_CLK, but depending on
ARM && HAVE_CLK is also fine with me. I would not like to have it depend
on EMMA specifically though because I want to increase built coverage.

	Arnd

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