u-boot.git/include/clk.h, branch v2019.10

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

clk: Extend struct clk to provide information regarding clock rate

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

This commit extends the struct clk to provide information regarding the
clock rate.
As a result the clock tree traversal is performed at most once, and further
reads are using the cached value.

Signed-off-by: Lukasz Majewski

dm: Fix documentation entry as there is no UCLASS_CLOCK uclass

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

There is no UCLASS_CLOCK uclass defined. Instead we do use the UCLASS_CLK.

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

clk: Get the CLK by index without device

2019-05-08T19:14:13+00:00

Getting a CLK by index with device is not straight forward
for some use-cases like handling clock operations for child
node in parent driver. So we need to process the child node
in parent probe via ofnode and process CLK operation for child
without udevice but with ofnode.

So add clk_get_by_index_nodev() and move the common code
in clk_get_by_index_tail() to use for clk_get_by_index()

Cc: Stephen Warren 
Signed-off-by: Jagan Teki 
Reviewed-by: Simon Glass