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[v6,02/14] clk: apn806: Turn the eMMC clock as optional for dts backwards compatible

Message ID 7dac8a83c938e1073c492a5168961596b54beb5d.1487091464.git-series.gregory.clement@free-electrons.com (mailing list archive)
State New, archived
Headers show

Commit Message

Gregory CLEMENT Feb. 14, 2017, 5:01 p.m. UTC 
First version of the binding didn't have the eMMC clock. This patch
allows to not registering the eMMC clock if it is not present in the
device tree. Then the device tree can be backwards compatible.

Suggested-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
 drivers/clk/mvebu/ap806-system-controller.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)
diff mbox

Patch

diff --git a/drivers/clk/mvebu/ap806-system-controller.c b/drivers/clk/mvebu/ap806-system-controller.c
index 0a785076b0c6..a5459abbc314 100644
--- a/drivers/clk/mvebu/ap806-system-controller.c
+++ b/drivers/clk/mvebu/ap806-system-controller.c
@@ -118,13 +118,19 @@  static int ap806_syscon_clk_probe(struct platform_device *pdev)
 	}
 
 	/* eMMC Clock is fixed clock divided by 3 */
-	of_property_read_string_index(np, "clock-output-names",
-				      4, &name);
-	ap806_clks[4] = clk_register_fixed_factor(NULL, name, fixedclk_name,
-						  0, 1, 3);
-	if (IS_ERR(ap806_clks[4])) {
-		ret = PTR_ERR(ap806_clks[4]);
-		goto fail4;
+	if (of_property_read_string_index(np, "clock-output-names",
+					  4, &name)) {
+		ap806_clk_data.clk_num--;
+		dev_warn(&pdev->dev,
+			 "eMMC clock mising: update the device tree!\n");
+	} else {
+		ap806_clks[4] = clk_register_fixed_factor(NULL, name,
+							  fixedclk_name,
+							  0, 1, 3);
+		if (IS_ERR(ap806_clks[4])) {
+			ret = PTR_ERR(ap806_clks[4]);
+			goto fail4;
+		}
 	}
 
 	of_clk_add_provider(np, of_clk_src_onecell_get, &ap806_clk_data);