Hi Andrew,

On 18-08-01 02:55 PM, Andrew Lunn wrote:

quoted

md->core_clk = devm_clk_get(&pdev->dev, NULL);
if (md->core_clk == ERR_PTR(-ENOENT) || md->core_clk == ERR_PTR(-EINVAL)) {
	/* clock is optional, without it the default
	 * rate divider register values will be used
	 */
	md->core_clk = NULL;
} else if (IS_ERR(md->core_clk)) {
	return PTR_ERR(md->core_clk);
} else {
	rc = clk_prepare_enable(md->core_clk);
	...
}

As Florian pointed out, the clk_ API is happy to take a NULL pointer
for a clock. So you don't need this last else.

    Andrew

I do return with an error from the probe if the clk_prepare_enable() fails,
so I was calling the prepare with a valid clock.

In the other places where I used the clock, the return values were being
ignored.

The 'else' part should have been, I apologize for the confusion.

if (md->core_clk == ERR_PTR(-ENOENT) || md->core_clk == ERR_PTR(-EINVAL)) {
 	/* clock is optional, without it the default
 	 * rate divider register values will be used
 	 */
 	md->core_clk = NULL;
} else if (IS_ERR(md->core_clk)) {
 	return PTR_ERR(md->core_clk);
} else {
	rc = clk_prepare_enable(md->core_clk);
	if (rc) {
		dev_err(&pdev->dev, "failed to enable core clk\n");
		return rc;
	}
}


Thanks
Arun