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clk: apn806: Turn the eMMC clock as optional for dts backwards compatible 

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>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Gregory CLEMENT 2017-03-30 17:22:54 +02:00 committed by Ulf Hansson
parent a8309cedcd
commit b92a3bcc7c
1 changed files with 13 additions and 7 deletions
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20
drivers/clk/mvebu/ap806-system-controller.c
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@ -136,13 +136,19 @@ 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);