u-boot.git/include/clk.h, branch v2020.01

drivers: clk: Fix using assigned-clocks in the node of the clock it sets up

2019-10-22T14:14:05+00:00

This fixes the case where assigned-clocks is used to define a clock
defaults inside this same clock's node. This is used sometimes to setup a
default parents and/or rate for a clock.

example:
muxed_clock: muxed_clock {
	clocks = <&clk_provider 0>, <&clk_provider 1>;
	#clock-cells = <0>;
	assigned-clocks = <&muxed_clock>;
	assigned-clock-parents = <&clk_provider 1>;
};

It doesn't work in u-boot because the assigned-clocks are setup *before*
the clock is probed. (clk_set_parent() will likely crash or fail if called
before the device probe function)
Making it work by handling "assigned-clocks" in 2 steps: first before the
clk device is probed, and then after the clk device is probed.

Signed-off-by: Jean-Jacques Hiblot

drivers: clk: Add a managed API to get clocks from the device-tree

2019-10-22T14:14:05+00:00

Add devm_clk_get(), devm_clk_get_optional() to get clocks from the
device-tree. The clocks is automatically released and the data structure
freed when the device is unbound.
Also add devm_clk_put() to release the clock and free the data structure
manually.

Signed-off-by: Jean-Jacques Hiblot

drivers: clk: Handle gracefully NULL pointers

2019-10-22T14:14:05+00:00

Prepare the way for a managed CLK API by handling NULL pointers without
crashing nor failing.

Signed-off-by: Jean-Jacques Hiblot

clk: introduce enable_count

2019-08-21T22:10:09+00:00

As what Linux Kernel 5.3.0 provides when enable/disable clk,
there is an enable_count in clk_core_disable/enable. Introduce
enable_count to track the clk enable/disable count when
clk_enable/disable for CCF. And Initialize enable_count to 0 when
register the clk.

And clk tree dump with enable_count will be supported, it will
be easy for us to check the clk status with enable_count

Signed-off-by: Peng Fan

clk: add support for clk_is_match()

2019-08-12T17:33:38+00:00

Add support for clk_is_match() which is required to
know if two clock pointers point to the same exact
physical clock.

Also add a unit test for the new API.

Reviewed-by: Lokesh Vutla 
Signed-off-by: Sekhar Nori

clk: introduce clk_dev_binded

2019-07-31T07:20:51+00:00

When support Clock Common Framework, U-Boot use dev for
clk tree information, there is no clk->parent. When
support composite clk, it contains mux/gate/divider,
but the mux/gate/divider is not binded with device.
So we could not use dev_get_uclass_priv to get the correct
clk_mux/gate/divider. So add clk_dev_binded to let
choose the correct method.

Signed-off-by: Peng Fan

dm: clk: Define clk_get_by_id() for clk operations

2019-07-19T12:50:30+00:00

This commit adds the clk_get_by_id() function, which is responsible
for getting the udevice with matching clk->id. Such approach allows
re-usage of inherit DM list relationship for the same class (UCLASS_CLK).
As a result - we don't need any other external list - it is just enough
to look for UCLASS_CLK related udevices.

Signed-off-by: Lukasz Majewski 
Reviewed-by: Peng Fan

dm: clk: Define clk_get_parent_rate() for clk operations

2019-07-19T12:50:30+00:00

This commit adds the clk_get_parent_rate() function, which is responsible
for getting the rate of parent clock.
Unfortunately, u-boot's DM support for getting parent is different
(the parent relationship is in udevice) than the one in Common Clock
Framework [CCF] in Linux.

To alleviate this problem - the clk_get_parent_rate() function has been
introduced to clk-uclass.c.

Signed-off-by: Lukasz Majewski 
Reviewed-by: Peng Fan

dm: clk: Define clk_get_parent() for clk operations

2019-07-19T12:50:30+00:00

This commit adds the clk_get_parent() function, which is responsible
for getting the parent's struct clock pointer.

U-Boot's DM support for getting parent is different (the parent
relationship is in udevice) than the one in Common Clock Framework [CCF]
in Linux. To obtain the pointer to struct clk of parent the
pdev->uclass_priv field is read via dev_get_clk_ptr() wrapper.

Signed-off-by: Lukasz Majewski 
Reviewed-by: Peng Fan

clk: Extend struct clk to provide clock type agnostic flags

2019-07-19T12:50:30+00:00

This commit extends the struct clk to provide information regarding the
flags related to this devices.

Those flags are clk device agnostic and indicate generic features
(like e.g. CLK_GET_RATE_NOCACHE - the need to always recalculate the rate).

Signed-off-by: Lukasz Majewski 
Reviewed-by: Peng Fan