linux-kernel - RE: [PATCH 1/2] i2c: Add support for Ux500/Nomadik I2C controller

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Date:	Thu, 7 Jan 2010 21:37:04 +0100
From:	"Linus Walleij" <linus.walleij@...ricsson.com>
To:	"Srinidhi KASAGAR" <srinidhi.kasagar@...ricsson.com>,
	<linux-i2c@...r.kernel.org>
Cc:	<ben-linux@...ff.org>, <linux-kernel@...r.kernel.org>,
	<STEricsson_nomadik_linux@...t.st.com>, <sachin.verma@...com>,
	<andrea.gallo@...ricsson.com>
Subject: RE: [PATCH 1/2] i2c: Add support for Ux500/Nomadik I2C controller

Hi Srinidhi, great work!

Just a few quickies, if you fix these it's
Acked-by: Linus Walleij <linus.walleij@...ricsson.com> 

> diff --git a/arch/arm/plat-nomadik/include/plat/i2c.h 
> b/arch/arm/plat-nomadik/include/plat/i2c.h
> +enum i2c_freq_mode {
> +	I2C_FREQ_MODE_STANDARD,		/* up to 100 Kb/s */
> +	I2C_FREQ_MODE_FAST,		/* up to 400 Kb/s */
> +	I2C_FREQ_MODE_FAST_PLUS,	/* up to 1 Mb/s */
> +	I2C_FREQ_MODE_HIGH_SPEED	/* up to 3.4 Mb/s */
> +};
> +
> +enum i2c_addr_mode {
> +	I2C_7_BIT_ADDRESS = 0x1,
> +	I2C_10_BIT_ADDRESS = 0x2
> +};

Which field in the struct will use this? Can't
I2C_FUNC_10BIT_ADDR and I2C_M_TEN from include/linux/i2c.h (and
siblings) be used for this instead? Leftover?

You have this later:

(...)
+		if (unlikely(msgs[i].flags & I2C_M_TEN)) {
+			dev_err(&dev->pdev->dev, "10 bit addressing"
+					"not supported\n");
+			return -EINVAL;
(...)

Hmmmm?

> +
> +struct nmk_i2c_controller {

Please use kerneldoc for these comments.
(see Documentation/kernel-doc-nano-HOWTO.txt)

> +	unsigned long	clk_freq;
> +	unsigned short	slsu;	/* slave data set up time */

Comment which unit this is in. (Nanosecs I think?)

> +	unsigned char 	tft;	/* Tx FIFO Threshold */
> +	unsigned char 	rft;	/* Rx FIFO Threshold */

In bytes?

> +	unsigned short	sm;	/* speed mode */

Shouldn't this last element be 
enum i2c_freq_mode sm
then?

> +++ b/drivers/i2c/busses/i2c-nmk.c
(...)
> +	dev->irq = platform_get_irq(pdev, 0);
> +	ret = request_irq(dev->irq, i2c_irq_handler, IRQF_DISABLED,
> +				DRIVER_NAME, dev);

Since I2C IRQs can be a bit tedious, could this be converted
to a request_threaded_irq()? OK I know that is probably a bit
intrusive and can very well be done later (so no blocker) but
think about it.

Linus Walleij
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