Message-ID: <20090331225258.GN19758@fluff.org.uk>
Date:	Tue, 31 Mar 2009 23:52:58 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Daniel Gl??ckner <dg@...ix.com>
Cc:	Chris Zankel <chris@...kel.net>, Ben Dooks <ben-linux@...ff.org>,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	Oskar Schirmer <os@...ix.com>
Subject: Re: [patch 1/5] i2c: xtensa s6000 i2c driver

On Mon, Mar 23, 2009 at 04:05:14PM +0100, Daniel Gl??ckner wrote:
> From: Oskar Schirmer <os@...ix.com>
> 
> Support for the s6000 on-chip i2c controller.
> 
> Signed-off-by: Oskar Schirmer <os@...ix.com>
> Signed-off-by: Daniel Gl??ckner <dg@...ix.com>

Not going to merge this on my first pull request to linus, there's
a few things that I'd like to get answered before.

> ---
>  drivers/i2c/busses/Kconfig     |   10 +
>  drivers/i2c/busses/Makefile    |    1 +
>  drivers/i2c/busses/i2c-s6000.c |  380 ++++++++++++++++++++++++++++++++++++++++
>  drivers/i2c/busses/i2c-s6000.h |   79 +++++++++
>  include/linux/i2c/s6000.h      |   10 +
>  5 files changed, 480 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/i2c/busses/i2c-s6000.c
>  create mode 100644 drivers/i2c/busses/i2c-s6000.h
>  create mode 100644 include/linux/i2c/s6000.h
> 
> diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
> index 7f95905..904def4 100644
> --- a/drivers/i2c/busses/Kconfig
> +++ b/drivers/i2c/busses/Kconfig
> @@ -461,6 +461,16 @@ config I2C_S3C2410
>  	  Say Y here to include support for I2C controller in the
>  	  Samsung S3C2410 based System-on-Chip devices.
>  
> +config I2C_S6000
> +	tristate "S6000 I2C support"
> +	depends on XTENSA_VARIANT_S6000
> +	help
> +	  This driver supports the on chip I2C device on the
> +	  S6000 xtensa processor family.
> +
> +	  To compile this driver as a module, choose M here. The module
> +	  will be called i2c-s6000.
> +
>  config I2C_SH7760
>  	tristate "Renesas SH7760 I2C Controller"
>  	depends on CPU_SUBTYPE_SH7760
> diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
> index 0c2c4b2..f7989d1 100644
> --- a/drivers/i2c/busses/Makefile
> +++ b/drivers/i2c/busses/Makefile
> @@ -43,6 +43,7 @@ obj-$(CONFIG_I2C_PASEMI)	+= i2c-pasemi.o
>  obj-$(CONFIG_I2C_PNX)		+= i2c-pnx.o
>  obj-$(CONFIG_I2C_PXA)		+= i2c-pxa.o
>  obj-$(CONFIG_I2C_S3C2410)	+= i2c-s3c2410.o
> +obj-$(CONFIG_I2C_S6000)		+= i2c-s6000.o
>  obj-$(CONFIG_I2C_SH7760)	+= i2c-sh7760.o
>  obj-$(CONFIG_I2C_SH_MOBILE)	+= i2c-sh_mobile.o
>  obj-$(CONFIG_I2C_SIMTEC)	+= i2c-simtec.o
> diff --git a/drivers/i2c/busses/i2c-s6000.c b/drivers/i2c/busses/i2c-s6000.c
> new file mode 100644
> index 0000000..88e3fdc
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-s6000.c
> @@ -0,0 +1,380 @@
> +/*
> + * drivers/i2c/busses/i2c-s6000.c
> + *
> + * Description: Driver for S6000 Family I2C Interface
> + *	(c) 2008 emlix GmbH <info@...ix.com>

Note, I think you need Copyright here as well, (c) needs to be a
proper c in circle i've been informed.

> + * Author:	Oskar Schirmer <os@...ix.com>
> + *
> + * Partially based on i2c-bfin-twi.c driver by <sonic.zhang@...log.com>
> + * Copyright (c) 2005-2007 Analog Devices, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/i2c/s6000.h>
> +#include <linux/timer.h>
> +#include <linux/spinlock.h>
> +#include <linux/completion.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +
> +#include <asm/io.h>
> +#include "i2c-s6000.h"
> +
> +#define POLL_TIMEOUT	(2 * HZ)
> +

would be nice to have some documentation for each of the members
of this.

> +struct s6i2c_if {
> +	u8 __iomem		*reg;
> +	int			irq;
> +	spinlock_t		lock;
> +	struct i2c_msg		*msgs;
> +	int			msgs_num, msgs_push, msgs_done;
> +	unsigned		push, done;
> +	int			timeout_count;
> +	struct timer_list	timeout_timer;
> +	struct i2c_adapter	adap;
> +	struct completion	complete;
> +	struct clk		*clk;
> +	struct resource		*res;
> +};
> +
> +#define I2C_RD16(iface, n) readw(iface->reg + (n))
> +#define I2C_WR16(iface, n, v) writew(v, iface->reg + (n))
> +#define I2C_RD32(iface, n) readl(iface->reg + (n))
> +#define I2C_WR32(iface, n, v) writel(v, iface->reg + (n))

tried inline functions for these?

> +
> +static struct s6i2c_if s6i2c_if;
> +
> +static void s6i2c_handle_interrupt(struct s6i2c_if *iface)
> +{
> +	if (I2C_RD16(iface, S6_I2C_INTRSTAT) & (1 << S6_I2C_INTR_TXABRT)) {
> +		I2C_RD16(iface, S6_I2C_CLRTXABRT);
> +		I2C_WR16(iface, S6_I2C_INTRMASK, 0);
> +		complete(&iface->complete);
> +		return;
> +	}
> +	if (iface->msgs_done >= iface->msgs_num) {
> +		printk(KERN_DEBUG "spurious I2C irq: %x\n",
> +		       I2C_RD16(iface, S6_I2C_INTRSTAT));
> +		I2C_WR16(iface, S6_I2C_INTRMASK, 0);
> +		return;
> +	}
> +	while ((iface->msgs_push < iface->msgs_num)
> +	    && (I2C_RD16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_TFNF))) {
> +		struct i2c_msg *m = &iface->msgs[iface->msgs_push];
> +		if (!(m->flags & I2C_M_RD))
> +			I2C_WR16(iface, S6_I2C_DATACMD, m->buf[iface->push]);
> +		else
> +			I2C_WR16(iface, S6_I2C_DATACMD,
> +				 1 << S6_I2C_DATACMD_READ);
> +		if (++iface->push >= m->len) {
> +			iface->push = 0;
> +			iface->msgs_push += 1;
> +		}
> +	}
> +	do {
> +		struct i2c_msg *m = &iface->msgs[iface->msgs_done];
> +		if (!(m->flags & I2C_M_RD)) {
> +			if (iface->msgs_done < iface->msgs_push)
> +				iface->msgs_done += 1;
> +			else
> +				break;
> +		} else if (I2C_RD16(iface, S6_I2C_STATUS)
> +				& (1 << S6_I2C_STATUS_RFNE)) {
> +			m->buf[iface->done] = I2C_RD16(iface, S6_I2C_DATACMD);
> +			if (++iface->done >= m->len) {
> +				iface->done = 0;
> +				iface->msgs_done += 1;
> +			}
> +		} else{
> +			break;
> +		}
> +	} while (iface->msgs_done < iface->msgs_num);
> +	if (iface->msgs_done >= iface->msgs_num) {
> +		I2C_WR16(iface, S6_I2C_INTRMASK, 1 << S6_I2C_INTR_TXABRT);
> +		complete(&iface->complete);
> +	} else if (iface->msgs_push >= iface->msgs_num) {
> +		I2C_WR16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |
> +						 (1 << S6_I2C_INTR_RXFULL));
> +	} else {
> +		I2C_WR16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |
> +						 (1 << S6_I2C_INTR_TXEMPTY) |
> +						 (1 << S6_I2C_INTR_RXFULL));
> +	}
> +}
> +
> +static irqreturn_t s6i2c_interrupt_entry(int irq, void *dev_id)
> +{
> +	struct s6i2c_if *iface = dev_id;
> +	if (!(I2C_RD16(iface, S6_I2C_STATUS) & ((1 << S6_I2C_INTR_RXUNDER)
> +					      | (1 << S6_I2C_INTR_RXOVER)
> +					      | (1 << S6_I2C_INTR_RXFULL)
> +					      | (1 << S6_I2C_INTR_TXOVER)
> +					      | (1 << S6_I2C_INTR_TXEMPTY)
> +					      | (1 << S6_I2C_INTR_RDREQ)
> +					      | (1 << S6_I2C_INTR_TXABRT)
> +					      | (1 << S6_I2C_INTR_RXDONE)
> +					      | (1 << S6_I2C_INTR_ACTIVITY)
> +					      | (1 << S6_I2C_INTR_STOPDET)
> +					      | (1 << S6_I2C_INTR_STARTDET)
> +					      | (1 << S6_I2C_INTR_GENCALL))))
> +		return IRQ_NONE;
> +
> +	spin_lock(&iface->lock);
> +	del_timer(&iface->timeout_timer);
> +	s6i2c_handle_interrupt(iface);
> +	spin_unlock(&iface->lock);
> +	return IRQ_HANDLED;
> +}
> +
> +static void s6i2c_timeout(unsigned long data)
> +{
> +	struct s6i2c_if *iface = (struct s6i2c_if *)data;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&iface->lock, flags);
> +	s6i2c_handle_interrupt(iface);
> +	if (--iface->timeout_count > 0) {
> +		iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
> +		add_timer(&iface->timeout_timer);
> +	} else {
> +		complete(&iface->complete);
> +		I2C_WR16(iface, S6_I2C_INTRMASK, 0);
> +	}
> +	spin_unlock_irqrestore(&iface->lock, flags);
> +}
> +
> +static int s6i2c_master_xfer(struct i2c_adapter *adap,
> +				struct i2c_msg *msgs, int num)
> +{
> +	struct s6i2c_if *iface = adap->algo_data;
> +	int i;
> +	if (num == 0)
> +		return 0;
> +	if (I2C_RD16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))
> +		yield();
> +	I2C_WR16(iface, S6_I2C_INTRMASK, 0);
> +	I2C_RD16(iface, S6_I2C_CLRINTR);
> +	for (i = 0; i < num; i++) {
> +		if (msgs[i].flags & I2C_M_TEN) {
> +			dev_err(&(adap->dev),
> +				"s6i2c: 10 bits addr not supported\n");
> +			return -EINVAL;
> +		}
> +		if (msgs[i].len == 0) {
> +			dev_err(&(adap->dev),
> +				"s6i2c: zero length message not supported\n");
> +			return -EINVAL;
> +		}
> +		if (msgs[i].addr != msgs[0].addr) {
> +			dev_err(&(adap->dev),
> +				"s6i2c: multiple xfer cannot change target\n");
> +			return -EINVAL;
> +		}
> +	}
> +	iface->msgs = msgs;
> +	iface->msgs_num = num;
> +	iface->msgs_push = 0;
> +	iface->msgs_done = 0;
> +	iface->push = 0;
> +	iface->done = 0;
> +	iface->timeout_count = 10;
> +	I2C_WR16(iface, S6_I2C_TAR, msgs[0].addr);
> +	I2C_WR16(iface, S6_I2C_ENABLE, 1);
> +	I2C_WR16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXEMPTY) |
> +					 (1 << S6_I2C_INTR_TXABRT));
> +	iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
> +	add_timer(&iface->timeout_timer);
> +	wait_for_completion(&iface->complete);
> +	del_timer_sync(&iface->timeout_timer);
> +	while (I2C_RD32(iface, S6_I2C_TXFLR) > 0)
> +		schedule();
> +	while (I2C_RD16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))
> +		schedule();
> +	I2C_WR16(iface, S6_I2C_INTRMASK, 0);
> +	I2C_WR16(iface, S6_I2C_ENABLE, 0);
> +	return iface->msgs_done;
> +}
> +
> +static u32 s6i2c_functionality(struct i2c_adapter *adap)
> +{
> +	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static struct i2c_algorithm s6i2c_algorithm = {
> +	.master_xfer   = s6i2c_master_xfer,
> +	.functionality = s6i2c_functionality,
> +};
> +
> +static u16 __devinit nanoseconds_on_clk(struct s6i2c_if *iface, u32 ns)
> +{
> +	u64 dividend = (u64)ns * clk_get_rate(iface->clk);
> +	do_div(dividend, 1000000000);
> +	if (dividend > 0xffff)
> +		return 0xffff;
> +	return dividend;
> +}

do you desperately need to be _that_ accurate?

> +static int __devinit s6i2c_probe(struct platform_device *dev)
> +{
> +	struct s6i2c_if *iface = &s6i2c_if;
> +	struct i2c_adapter *p_adap;
> +	const char *clock;
> +	int bus_num, rc;
> +	spin_lock_init(&(iface->lock));
> +	init_completion(&(iface->complete));

please don't do &(variable) it is fugly.

> +	iface->irq = platform_get_irq(dev, 0);
> +	if (iface->irq < 0) {
> +		rc = iface->irq;
> +		goto err_out;
> +	}
> +	iface->res = platform_get_resource(dev, IORESOURCE_MEM, 0);
> +	if (!iface->res) {
> +		rc = -ENXIO;
> +		goto err_out;
> +	}
> +	iface->res = request_mem_region(iface->res->start,
> +					iface->res->end - iface->res->start + 1,
> +					dev->dev.bus_id);
> +	if (!iface->res) {
> +		rc = -EBUSY;
> +		goto err_out;
> +	}
> +	iface->reg = ioremap_nocache(iface->res->start,
> +				     iface->res->end - iface->res->start + 1);
> +	if (!iface->reg) {
> +		rc = -ENOMEM;
> +		goto err_reg;
> +	}
> +	clock = 0;
> +	bus_num = -1;
> +	if (dev->dev.platform_data) {
> +		struct s6_i2c_platform_data *pdata = dev->dev.platform_data;
> +		bus_num = pdata->bus_num;
> +		clock = pdata->clock;
> +	}
> +	iface->clk = clk_get(&dev->dev, clock);
> +	if (IS_ERR(iface->clk)) {
> +		rc = PTR_ERR(iface->clk);
> +		goto err_map;
> +	}

passing the name in the platform device is a bit nasty, if there's
only one clock for the device then it should have been dealt with
at the arch level and doing clk_get(&dev->dev, NULL) should be
acceptable.

> +	rc = clk_enable(iface->clk);
> +	if (rc < 0)
> +		goto err_clk_put;
> +	init_timer(&(iface->timeout_timer));
> +	iface->timeout_timer.function = s6i2c_timeout;
> +	iface->timeout_timer.data = (unsigned long)iface;
> +	p_adap = &iface->adap;
> +	strlcpy(p_adap->name, dev->name, sizeof(p_adap->name));
> +	p_adap->algo = &s6i2c_algorithm;
> +	p_adap->algo_data = iface;
> +	p_adap->nr = bus_num;
> +	p_adap->class = 0;
> +	p_adap->dev.parent = &dev->dev;

some spacing for readability would be nice.

> +	I2C_WR16(iface, S6_I2C_INTRMASK, 0);
> +	rc = request_irq(iface->irq, s6i2c_interrupt_entry,
> +			 IRQF_SHARED, dev->name, iface);
> +	if (rc) {
> +		dev_err(&(p_adap->dev), "s6i2c: cant get IRQ %d\n", iface->irq);
> +		goto err_clk_dis;
> +	}
> +	I2C_WR16(iface, S6_I2C_ENABLE, 0);
> +	udelay(1);
> +	I2C_WR32(iface, S6_I2C_SRESET, 1 << S6_I2C_SRESET_IC_SRST);
> +	I2C_WR16(iface, S6_I2C_CLRTXABRT, 1);
> +	I2C_WR16(iface, S6_I2C_CON,
> +			(1 << S6_I2C_CON_MASTER) |
> +			(S6_I2C_CON_SPEED_NORMAL << S6_I2C_CON_SPEED) |
> +			(0 << S6_I2C_CON_10BITSLAVE) |
> +			(0 << S6_I2C_CON_10BITMASTER) |
> +			(1 << S6_I2C_CON_RESTARTENA) |
> +			(1 << S6_I2C_CON_SLAVEDISABLE));
> +	I2C_WR16(iface, S6_I2C_SSHCNT, nanoseconds_on_clk(iface, 4000));
> +	I2C_WR16(iface, S6_I2C_SSLCNT, nanoseconds_on_clk(iface, 4700));
> +	I2C_WR16(iface, S6_I2C_FSHCNT, nanoseconds_on_clk(iface, 600));
> +	I2C_WR16(iface, S6_I2C_FSLCNT, nanoseconds_on_clk(iface, 1300));
> +	I2C_WR16(iface, S6_I2C_RXTL, 0);
> +	I2C_WR16(iface, S6_I2C_TXTL, 0);
> +	platform_set_drvdata(dev, iface);
> +	if (bus_num < 0)
> +		rc = i2c_add_adapter(p_adap);
> +	else
> +		rc = i2c_add_numbered_adapter(p_adap);
> +	if (rc)
> +		goto err_irq_free;
> +	return 0;
> +
> +err_irq_free:
> +	free_irq(iface->irq, iface);
> +err_clk_dis:
> +	clk_disable(iface->clk);
> +err_clk_put:
> +	clk_put(iface->clk);
> +err_map:
> +	iounmap(iface->reg);
> +err_reg:
> +	release_mem_region(iface->res->start,
> +			   iface->res->end - iface->res->start + 1);
> +err_out:
> +	return rc;
> +}
> +
> +static int __devexit s6i2c_remove(struct platform_device *pdev)
> +{
> +	struct s6i2c_if *iface = platform_get_drvdata(pdev);
> +	I2C_WR16(iface, S6_I2C_ENABLE, 0);
> +	platform_set_drvdata(pdev, NULL);
> +	i2c_del_adapter(&(iface->adap));
> +	free_irq(iface->irq, iface);
> +	clk_disable(iface->clk);
> +	clk_put(iface->clk);
> +	iounmap(iface->reg);
> +	release_mem_region(iface->res->start,
> +			   iface->res->end - iface->res->start + 1);

resource_size() would be good here, and elsewhere in the driver.

> +	return 0;
> +}
> +
> +static struct platform_driver s6i2c_driver = {
> +	.probe		= s6i2c_probe,
> +	.remove		= __devexit_p(s6i2c_remove),
> +	.driver		= {
> +		.name	= "i2c-s6000",
> +		.owner	= THIS_MODULE,
> +	},
> +};
> +
> +static int __init s6i2c_init(void)
> +{
> +	pr_info("I2C: S6000 I2C driver\n");
> +	return platform_driver_register(&s6i2c_driver);
> +}
> +
> +static void __exit s6i2c_exit(void)
> +{
> +	platform_driver_unregister(&s6i2c_driver);
> +}
> +
> +MODULE_DESCRIPTION("I2C-Bus adapter routines for S6000 I2C");
> +MODULE_LICENSE("GPL");
> +
> +subsys_initcall(s6i2c_init);
> +module_exit(s6i2c_exit);


as a note, the code is quite dense, a few blank lines would be
nice.

> diff --git a/drivers/i2c/busses/i2c-s6000.h b/drivers/i2c/busses/i2c-s6000.h
> new file mode 100644
> index 0000000..ff23b81
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-s6000.h
> @@ -0,0 +1,79 @@
> +/*
> + * drivers/i2c/busses/i2c-s6000.h
> + *
> + * This file is subject to the terms and conditions of the GNU General Public
> + * License.  See the file "COPYING" in the main directory of this archive
> + * for more details.
> + *
> + * Copyright (C) 2008 Emlix GmbH <info@...ix.com>
> + * Author:	Oskar Schirmer <os@...ix.com>
> + */
> +
> +#ifndef __DRIVERS_I2C_BUSSES_I2C_S6000_H
> +#define __DRIVERS_I2C_BUSSES_I2C_S6000_H
> +
> +#define S6_I2C_CON		0x000
> +#define S6_I2C_CON_MASTER		0
> +#define S6_I2C_CON_SPEED		1
> +#define S6_I2C_CON_SPEED_NORMAL			1
> +#define S6_I2C_CON_SPEED_FAST			2
> +#define S6_I2C_CON_SPEED_MASK			3
> +#define S6_I2C_CON_10BITSLAVE		3
> +#define S6_I2C_CON_10BITMASTER		4
> +#define S6_I2C_CON_RESTARTENA		5
> +#define S6_I2C_CON_SLAVEDISABLE		6
> +#define S6_I2C_TAR		0x004
> +#define S6_I2C_TAR_GCORSTART		10
> +#define S6_I2C_TAR_SPECIAL		11
> +#define S6_I2C_SAR		0x008
> +#define S6_I2C_HSMADDR		0x00C
> +#define S6_I2C_DATACMD		0x010
> +#define S6_I2C_DATACMD_READ		8
> +#define S6_I2C_SSHCNT		0x014
> +#define S6_I2C_SSLCNT		0x018
> +#define S6_I2C_FSHCNT		0x01C
> +#define S6_I2C_FSLCNT		0x020
> +#define S6_I2C_INTRSTAT		0x02C
> +#define S6_I2C_INTRMASK		0x030
> +#define S6_I2C_RAWINTR		0x034
> +#define S6_I2C_INTR_RXUNDER		0
> +#define S6_I2C_INTR_RXOVER		1
> +#define S6_I2C_INTR_RXFULL		2
> +#define S6_I2C_INTR_TXOVER		3
> +#define S6_I2C_INTR_TXEMPTY		4
> +#define S6_I2C_INTR_RDREQ		5
> +#define S6_I2C_INTR_TXABRT		6
> +#define S6_I2C_INTR_RXDONE		7
> +#define S6_I2C_INTR_ACTIVITY		8
> +#define S6_I2C_INTR_STOPDET		9
> +#define S6_I2C_INTR_STARTDET		10
> +#define S6_I2C_INTR_GENCALL		11
> +#define S6_I2C_RXTL		0x038
> +#define S6_I2C_TXTL		0x03C
> +#define S6_I2C_CLRINTR		0x040
> +#define S6_I2C_CLRRXUNDER	0x044
> +#define S6_I2C_CLRRXOVER	0x048
> +#define S6_I2C_CLRTXOVER	0x04C
> +#define S6_I2C_CLRRDREQ		0x050
> +#define S6_I2C_CLRTXABRT	0x054
> +#define S6_I2C_CLRRXDONE	0x058
> +#define S6_I2C_CLRACTIVITY	0x05C
> +#define S6_I2C_CLRSTOPDET	0x060
> +#define S6_I2C_CLRSTARTDET	0x064
> +#define S6_I2C_CLRGENCALL	0x068
> +#define S6_I2C_ENABLE		0x06C
> +#define S6_I2C_STATUS		0x070
> +#define S6_I2C_STATUS_ACTIVITY		0
> +#define S6_I2C_STATUS_TFNF		1
> +#define S6_I2C_STATUS_TFE		2
> +#define S6_I2C_STATUS_RFNE		3
> +#define S6_I2C_STATUS_RFF		4
> +#define S6_I2C_TXFLR		0x074
> +#define S6_I2C_RXFLR		0x078
> +#define S6_I2C_SRESET		0x07C
> +#define S6_I2C_SRESET_IC_SRST		0
> +#define S6_I2C_SRESET_IC_MASTER_SRST	1
> +#define S6_I2C_SRESET_IC_SLAVE_SRST	2
> +#define S6_I2C_TXABRTSOURCE	0x080
> +
> +#endif
> diff --git a/include/linux/i2c/s6000.h b/include/linux/i2c/s6000.h

and again.

> new file mode 100644
> index 0000000..0b6b0c6
> --- /dev/null
> +++ b/include/linux/i2c/s6000.h
> @@ -0,0 +1,10 @@
> +#ifndef __LINUX_I2C_S6000_H
> +#define __LINUX_I2C_S6000_H
> +

documentation comments would be nice here too.

> +struct s6_i2c_platform_data {
> +	const char *clock;
> +	int bus_num;
> +};
> +
> +#endif
> +
> -- 
> 1.6.2.107.ge47ee
> 
> --
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-- 
Ben (ben@...ff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'
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