OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

clk: clk-gpio: propagate rate change to parent

Browse Source 
[ Upstream commit fc59462c5c ]

For an external clock source, which is gated via a GPIO, the
rate change should typically be propagated to the parent clock.

The situation where we are requiring this propagation, is when an
external clock is connected to override an internal clock (which typically
has a fixed rate). The external clock can have a different rate than the
internal one, and may also be variable, thus requiring the rate
propagation.

This rate change wasn't propagated until now, and it's unclear about cases
where this shouldn't be propagated. Thus, it's unclear whether this is
fixing a bug, or extending the current driver behavior. Also, it's unsure
about whether this may break any existing setups; in the case that it does,
a device-tree property may be added to disable this flag.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lkml.kernel.org/r/20191108071718.17985-1-alexandru.ardelean@analog.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Michael Hennerich 2019-11-08 09:17:18 +02:00 committed by Greg Kroah-Hartman
parent 0e219dae7c
commit 3d9b0a683e
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/clk/clk-gpio.c
View File

@ -280,7 +280,7 @@ static int gpio_clk_driver_probe(struct platform_device *pdev)
else
clk = clk_register_gpio_gate(&pdev->dev, node->name,
parent_names ? parent_names[0] : NULL, gpiod,
0);
CLK_SET_RATE_PARENT);
if (IS_ERR(clk))
return PTR_ERR(clk);