clk: Add get/enable/disable/release for a bulk of clocks

This patch adds a "bulk" API to the clock API in order to get/enable/disable
/release a group of clocks associated with a device.

This bulk API will avoid adding a copy of the same code to manage
a group of clocks in drivers.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c
index ad763795d9..6e99b3b15d 100644
--- a/drivers/clk/clk-uclass.c
+++ b/drivers/clk/clk-uclass.c
@@ -104,6 +104,39 @@ int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
 	return clk_get_by_indexed_prop(dev, "clocks", index, clk);
 }
 
+int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
+{
+	int i, ret, err, count;
+	
+	bulk->count = 0;
+
+	count = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
+	if (!count)
+		return 0;
+
+	bulk->clks = devm_kcalloc(dev, count, sizeof(struct clk), GFP_KERNEL);
+	if (!bulk->clks)
+		return -ENOMEM;
+
+	for (i = 0; i < count; i++) {
+		ret = clk_get_by_index(dev, i, &bulk->clks[i]);
+		if (ret < 0)
+			goto bulk_get_err;
+
+		++bulk->count;
+	}
+
+	return 0;
+
+bulk_get_err:
+	err = clk_release_all(bulk->clks, bulk->count);
+	if (err)
+		debug("%s: could release all clocks for %p\n",
+		      __func__, dev);
+
+	return ret;
+}
+
 static int clk_set_default_parents(struct udevice *dev)
 {
 	struct clk clk, parent_clk;
@@ -336,6 +369,19 @@ int clk_enable(struct clk *clk)
 	return ops->enable(clk);
 }
 
+int clk_enable_bulk(struct clk_bulk *bulk)
+{
+	int i, ret;
+
+	for (i = 0; i < bulk->count; i++) {
+		ret = clk_enable(&bulk->clks[i]);
+		if (ret < 0 && ret != -ENOSYS)
+			return ret;
+	}
+
+	return 0;
+}
+
 int clk_disable(struct clk *clk)
 {
 	const struct clk_ops *ops = clk_dev_ops(clk->dev);
@@ -348,6 +394,19 @@ int clk_disable(struct clk *clk)
 	return ops->disable(clk);
 }
 
+int clk_disable_bulk(struct clk_bulk *bulk)
+{
+	int i, ret;
+
+	for (i = 0; i < bulk->count; i++) {
+		ret = clk_disable(&bulk->clks[i]);
+		if (ret < 0 && ret != -ENOSYS)
+			return ret;
+	}
+
+	return 0;
+}
+
 UCLASS_DRIVER(clk) = {
 	.id		= UCLASS_CLK,
 	.name		= "clk",