On Mon, Jul 11, 2016 at 2:50 PM, Maxime Ripard
[off-list ref] wrote:

Hi,

On Fri, Jul 08, 2016 at 10:33:42PM +0800, Chen-Yu Tsai wrote:

quoted

The 32.768 kHz clock inside the A80 SoC is fed from an external source,
typically the AC100 RTC module.

Make the osc32k placeholder a fixed-factor clock so board dts files can
specify its source.

Signed-off-by: Chen-Yu Tsai <redacted>
---
Changes since v4: none
Changes since v3: none
Changes since v2: none
Changes since v1: none
---
 arch/arm/boot/dts/sun9i-a80-cubieboard4.dts | 5 +++++
 arch/arm/boot/dts/sun9i-a80-optimus.dts     | 5 +++++
 arch/arm/boot/dts/sun9i-a80.dtsi            | 9 +++------
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts b/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts
index cf2f4b72a841..04b014603659 100644
--- a/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts
+++ b/arch/arm/boot/dts/sun9i-a80-cubieboard4.dts

@@ -103,6 +103,11 @@
      allwinner,drive = <SUN4I_PINCTRL_40_MA>;
 };

+&osc32k {
+     /* osc32k input is from AC100 */
+     clocks = <&ac100_rtc 0>;
+};
+

I'm guessing that an unresolved dependency when the driver has not
loaded yet, or is not even compiled ?

How is it working then?

I assume the clk framework will leave it unresolved and unusable.
Also it seems that none of existing clks use it as a parent by
default. I will need to check the remaining unimplemented ones
though.

ChenYu