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Date: Tue, 26 Jun 2012 20:59:15 +0200
From: Sascha Hauer <s.hauer@pengutronix.de>
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Subject: Re: [PATCH 03/12] mach-davinci: add pin mux support
To: Jan Luebbe <jlu@pengutronix.de>
Cc: barebox@lists.infradead.org

On Tue, Jun 26, 2012 at 11:51:45AM +0200, Jan Luebbe wrote:
> Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
> ---
> +++ b/arch/arm/mach-davinci/mux.c
> @@ -0,0 +1,78 @@
> +/*
> + * Utility to set the DAVINCI MUX register from a table in mux.h
> + *
> + * Author: Vladimir Barinov, MontaVista Software, Inc. <source@mvista.com>
> + *
> + * Based on linux/arch/arm/plat-omap/mux.c:
> + * Copyright (C) 2003 - 2005 Nokia Corporation
> + *
> + * Written by Tony Lindgren
> + *
> + * 2007 (c) MontaVista Software, Inc. This file is licensed under
> + * the terms of the GNU General Public License version 2. This program
> + * is licensed "as is" without any warranty of any kind, whether express
> + * or implied.
> + *
> + * Copyright (C) 2008 Texas Instruments.
> + */
> +
> +#include <config.h>
> +#include <common.h>
> +#include <errno.h>
> +#include <io.h>
> +
> +#include <mach/da8xx.h>
> +#include <mach/mux.h>
> +
> +static void *pinmux_base = (void*)DA8XX_SYSCFG0_BASE + 0x120;
> +
> +/*
> + * Sets the DAVINCI MUX register
> + */
> +int davinci_cfg_reg(const struct mux_config *cfg)
> +{
> +	unsigned int reg_orig = 0, reg = 0;
> +	unsigned int mask, warn = 0;
> +
> +	/* Update the mux register in question */
> +	if (cfg->mask) {
> +		unsigned	tmp1, tmp2;
> +
> +		reg_orig = readl(pinmux_base + cfg->mux_reg);
> +
> +		mask = (cfg->mask << cfg->mask_offset);
> +		tmp1 = reg_orig & mask;
> +		reg = reg_orig & ~mask;
> +
> +		tmp2 = (cfg->mode << cfg->mask_offset);
> +		reg |= tmp2;
> +
> +		if (tmp1 != tmp2)
> +			warn = 1;

Does this 'warn' mean that this function actually changes something? If
yes, the variable should better be named 'changed'.

> +
> +		writel(reg, pinmux_base + cfg->mux_reg);
> +	}
> +
> +	if (warn) {
> +#ifdef DEBUG
> +		printk("MUX: setting register %s in %s (0x%08x) = 0x%08x -> 0x%08x\n", cfg->name,
> +		       cfg->mux_reg_name, (unsigned int)pinmux_base + cfg->mux_reg, reg_orig, reg);
> +#endif

You can just use the debug() function without ifdefs.

Sascha

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