Re: [PATCH 1/2] omap3isp: Use the common clock framework

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Hi Laurent,

I don't remember when did I see equally nice patch to the omap3isp driver!
:-) Thanks!

A few comments below.

On Thu, Apr 04, 2013 at 01:08:38PM +0200, Laurent Pinchart wrote:
...
> +static int isp_xclk_set_rate(struct clk_hw *hw, unsigned long rate,
> +			     unsigned long parent_rate)
> +{
> +	struct isp_xclk *xclk = to_isp_xclk(hw);
> +	unsigned long flags;
> +	u32 divider;
> +
> +	divider = isp_xclk_calc_divider(&rate, parent_rate);
> +
> +	spin_lock_irqsave(&xclk->lock, flags);
> +
> +	xclk->divider = divider;
> +	if (xclk->enabled)
> +		isp_xclk_update(xclk, divider);
> +
> +	spin_unlock_irqrestore(&xclk->lock, flags);
> +
> +	dev_dbg(xclk->isp->dev, "%s: cam_xclk%c set to %lu Hz (div %u)\n",
> +		__func__, xclk->id == ISP_XCLK_A ? 'a' : 'b', rate, divider);
> +	return 0;
> +}
> +
> +static const struct clk_ops isp_xclk_ops = {
> +	.prepare = isp_xclk_prepare,
> +	.unprepare = isp_xclk_unprepare,
> +	.enable = isp_xclk_enable,
> +	.disable = isp_xclk_disable,
> +	.recalc_rate = isp_xclk_recalc_rate,
> +	.round_rate = isp_xclk_round_rate,
> +	.set_rate = isp_xclk_set_rate,
> +};
> +
> +static const char *isp_xclk_parent_name = "cam_mclk";
> +
> +static const struct clk_init_data isp_xclk_init_data = {
> +	.name = "cam_xclk",
> +	.ops = &isp_xclk_ops,
> +	.parent_names = &isp_xclk_parent_name,
> +	.num_parents = 1,
> +};

isp_xclk_init_data is unused.

> +static int isp_xclk_init(struct isp_device *isp)
> +{
> +	struct isp_platform_data *pdata = isp->pdata;
> +	struct clk_init_data init;

Init can be declared inside the loop.

> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
> +		struct isp_xclk *xclk = &isp->xclks[i];
> +		struct clk *clk;
> +
> +		xclk->isp = isp;
> +		xclk->id = i == 0 ? ISP_XCLK_A : ISP_XCLK_B;
> +		xclk->divider = 1;
> +		spin_lock_init(&xclk->lock);
> +
> +		init.name = i == 0 ? "cam_xclka" : "cam_xclkb";
> +		init.ops = &isp_xclk_ops;
> +		init.parent_names = &isp_xclk_parent_name;
> +		init.num_parents = 1;
> +
> +		xclk->hw.init = &init;
> +
> +		clk = devm_clk_register(isp->dev, &xclk->hw);
> +		if (IS_ERR(clk))
> +			return PTR_ERR(clk);
> +
> +		if (pdata->xclks[i].con_id == NULL &&
> +		    pdata->xclks[i].dev_id == NULL)
> +			continue;
> +
> +		xclk->lookup = kzalloc(sizeof(*xclk->lookup), GFP_KERNEL);

How about devm_kzalloc()? You'd save a bit of error handling (which is btw.
missing now, as well as kfree in cleanup).

> +		if (xclk->lookup == NULL)
> +			return -ENOMEM;
> +
> +		xclk->lookup->con_id = pdata->xclks[i].con_id;
> +		xclk->lookup->dev_id = pdata->xclks[i].dev_id;
> +		xclk->lookup->clk = clk;
> +
> +		clkdev_add(xclk->lookup);
> +	}
> +
> +	return 0;
> +}
> +
> +static void isp_xclk_cleanup(struct isp_device *isp)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
> +		struct isp_xclk *xclk = &isp->xclks[i];
> +
> +		if (xclk->lookup)
> +			clkdev_drop(xclk->lookup);
> +	}
> +}

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@xxxxxx	XMPP: sailus@xxxxxxxxxxxxxx
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