linux-kernel - Re: [PATCH 2/2] mtd: msm_nand: Add initial msm nand driver support.

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Date:	Sat, 16 Apr 2011 11:31:52 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Murali Nalajala <mnalajal@...eaurora.org>
Cc:	dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Dima Zavin <dima@...roid.com>,
	Brian Swetland <swetland@...gle.com>,
	Arve Hjønnevåg <arve@...roid.com>
Subject: Re: [PATCH 2/2] mtd: msm_nand: Add initial msm nand driver support.

On Sat, 2011-04-16 at 11:20 +0300, Artem Bityutskiy wrote:
> > > +#define MSM_NAND_REG(off) (msm_nand_phys + (off))
> > > +
> > > +#define MSM_NAND_FLASH_CMD            MSM_NAND_REG(0x0000)
> > > +#define MSM_NAND_ADDR0                MSM_NAND_REG(0x0004)
> > >
> > > Could you please make the macros to take the "struct msm_nand_chip
> > > *chip" argument instead, and store the pase address there. Do not hide
> > > the fact that those macros are actually functions, not constant - this
> > > is error prone.
> > >
> > > Besides, I'm do not know your HW, but if you have several controllers
> > > with various base addresses - your driver won't work.
> > 
> > you are correct, we have multiple controllers, which breaks this logic 
> > in future.
> 
> So then make your macros to accept the base address as an argument
> instead please.

Or better make macros to be constants, and always use something like
base + MSM_NAND_FLASH_CMD - this is the standard approach.
-- 
Best Regards,
Artem Bityutskiy (Битюцкий Артём)

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