[PATCH v2] pinctrl/nomadik: make independent of prcmu driver

On 11/09/2012 03:28 AM, Linus Walleij wrote:

From: Jonas Aaberg <redacted>

Currently there are some unnecessary criss-cross
dependencies between the PRCMU driver in MFD and a lot of
other drivers, mainly because other drivers need to poke
around in the PRCM register range.

In cases like this there are actually just a few select
registers that the pinctrl driver need to read/modify/write,
and it turns out that no other driver is actually using
these registers, so there are no concurrency issues
whatsoever.

So: don't let the location of the register range complicate
things, just poke into these registers directly and skip
a layer of indirection.

Take this opportunity to add kerneldoc to the pinctrl
state container.

+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res) {
+		npct->prcm_base = devm_ioremap(&pdev->dev, res->start,
+					       resource_size(res));
+		if (!npct->prcm_base) {
+			dev_err(&pdev->dev,
+				"failed to ioremap PRCM registers\n");
+			return -ENOMEM;
+		}
+	} else {
+		dev_info(&pdev->dev,
+			 "No PRCM base, assume no ALT-Cx control is available\n");
+	}

Where is "assume no ALT-Cx control is available" implemented; I don't
see anything that uses npct->prcm_base to conditionally enable/block any
features. Is it just assumed that the DT won't contain any entries that
trigger writes to the PRCM registers? That seems fragile; it could cause
a "user"-triggered kernel crash.

Aside from that, this seems fine. Much smaller than V1:-)