linux-kernel - Re: [PATCH 2/9] add support for the TI VLYNQ bus

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Message-Id: <20090604042032.51ece7a9.akpm@linux-foundation.org>
Date:	Thu, 4 Jun 2009 04:20:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Florian Fainelli <florian@...nwrt.org>
Cc:	linux-kernel@...r.kernel.org, Ralf Baechle <ralf@...ux-mips.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 2/9] add support for the TI VLYNQ bus

On Thu, 4 Jun 2009 12:52:18 +0200 Florian Fainelli <florian@...nwrt.org> wrote:

> Le Tuesday 02 June 2009 07:08:54 Andrew Morton, vous avez __crit__:
> > On Mon, 1 Jun 2009 13:58:27 +0200 Florian Fainelli <florian@...nwrt.org> 
> wrote:
> > > This patch adds support for the TI VLYNQ high-speed,
> > > serial and packetized bus. This bus allows external
> > > devices to be connected to the System-on-Chip and
> > > appear in the main system memory just like any memory
> > > mapped peripheral. It is widely used in TI's networking
> > > and mutlimedia SoC, including the AR7 SoC.
> > >
> > >
> > > ...
> > >
> > > +struct vlynq_regs {
> > > +	u32 revision;
> > > +	u32 control;
> > > +	u32 status;
> > > +	u32 int_prio;
> > > +	u32 int_status;
> > > +	u32 int_pending;
> > > +	u32 int_ptr;
> > > +	u32 tx_offset;
> > > +	struct vlynq_mapping rx_mapping[4];
> > > +	u32 chip;
> > > +	u32 autonego;
> > > +	u32 unused[6];
> > > +	u32 int_device[8];
> > > +};
> > > +
> > > +#define vlynq_reg_read(reg) readl(&(reg))
> > > +#define vlynq_reg_write(reg, val)  writel(val, &(reg))
> >
> > grumble.  These just make the code harder to follow.  it'd be better to
> > open-code readl() and writel() at the callsites.
> 
> I do not understand how to fix this. Would an inlined accessors be a better 
> solution for you?

Just remove the accessors altogether.  Each place where there is a call
to vlynq_reg_read(), replace that with a call to readl().

Unless there's a reason not to do this.  For example, some hardware
might require a udelay(1) before each writel(), or some platforms might
want to use outl()/inl().  In cases like these, sure, standalone
functions are needed to handle them.

But if vlynq_reg_read() and vlynq_reg_write() will never do anything
apart from a bare readl()/writel() then let's just remove them
altogether, as they add nothing.

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