u-boot.git/drivers/clk, branch v2026.01

clk: scmi: Remove duplicated scmi_generic_protocol_version() request

2026-01-05T02:04:48+00:00

scmi_generic_protocol_version() request is done twice in scmi_clk_probe().
Remove first call which is useless.

Fixes: ae7e0330ce22 ("clk: scmi: add compatibility with clock protocol 2.0")
Reviewed-by: Peng Fan 
Reviewed-by: Marek Vasut 
Signed-off-by: Patrice Chotard 
Signed-off-by: Peng Fan

clk: scmi: Fix priv initialization in scmi_clk_gate()

2026-01-05T02:04:48+00:00

In scmi_clk_probe(), in case of CLK_CCF is not enabled, parent private
data is not set, so in scmi_clk_gate(), an uninitialized priv struct is
retrieved.

SCMI request is performed either using scmi_clk_state_in_v1 or
scmi_clk_state_in_v2 struct depending of the unpredictable value of
priv->version which leads to error during SCMI clock enable.

Issue detected on STM32MP157C-DK2 board using the SCMI device tree
stm32mp157c-dk2-scmi.dts.

Fixes: 0619cb32030b ("firmware: scmi: Add clock v3.2 CONFIG_SET support")
Reviewed-by: Peng Fan 
Reviewed-by: Marek Vasut 
Signed-off-by: Patrice Chotard 
Signed-off-by: Peng Fan

clk: scmi: Fix typo scmi_clk_get_attibute

2026-01-05T02:04:48+00:00

Fix typo attibute, rename scmi_clk_get_attibute() to
scmi_clk_get_attribute().

Reviewed-by: Peng Fan 
Reviewed-by: Marek Vasut 
Signed-off-by: Patrice Chotard 
Signed-off-by: Peng Fan

clk: renesas: Do not disable realtime modules on R8A77995 D3

2025-12-29T19:47:53+00:00

Later versions of the datasheet makes it clear D3 do not have any
realtime module stop control registers (RMSTPCRx). Remove the
manipulation of them from the module clock table to match this.

Suggested-by: Marek Vasut 
Signed-off-by: Niklas Söderlund

clk: renesas: Do not enable MSTP4 extra modules on R8A77995 D3

2025-12-29T19:47:53+00:00

Since commit a2bd99549c61 ("clk: renesas: Tear clock controller down
last before booting OS") enabling the module gated by bit 8 in MSTP4
prevents Linux from booting. The bits 8 and 7 of MSTP4 where only
documented in early versions of the datasheet and have since been
removed.

To allow Linux to boot update the MSTP4 enable value to reflect the
hardware default, 0x80.

Suggested-by: Marek Vasut 
Signed-off-by: Niklas Söderlund

clk: mediatek: remove duplicate '@parent' field doc

2025-12-16T17:14:31+00:00

Remove duplicate '@parent' field documentation in struct mtk_composite.
There is no need to say the same thing twice.

Also fix spelling mistake in the word "parent" while we're at it.

Signed-off-by: David Lechner

clk: renesas: Introduce temporary compound clock for SCP compatibility

2025-12-02T23:17:15+00:00

The current state of SCP on Renesas R-Car Gen5 is not yet final and
is still missing full clock control, the clock control is exposed as
separate enable/disable and rate controls.

Temporarily introduce custom local compound clock, which are used as
an adaptation layer between U-Boot clock tree and current state of
SCP, and which bind two SCP clock into a single compound clock, which
provides both enable/disable and rate controls.

This is mainly meant to be used by SD/eMMC controller, to allow the
driver to both turn its clock on and off, and also obtain the current
clock rate. This is going to be removed once the SCP clock protocol
solidifies.

Signed-off-by: Marek Vasut

clk: use private clk struct to access clock flags

2025-11-12T04:56:12+00:00

There may be cases where the flags set for a clock is not available.
This is usually the case with clocks which have been retrieved using
clk_request(). However, clock flags are found in their respective
private clock struct, so use that instead.

Signed-off-by: Kaustabh Chakraborty 
Signed-off-by: Minkyu Kang

clk: exynos: add support for Exynos7870 CMU

2025-11-12T04:56:12+00:00

Introduce a simple clock driver for Exynos7870's CMU blocks, more
specifically, CMU_MIF, CMU_FSYS, and CMU_PERI banks. This should be
enough to serve U-Boot's minimal requirements.

Signed-off-by: Kaustabh Chakraborty 
Signed-off-by: Minkyu Kang

clk: exynos: add function for Samsung CMU ops->request

2025-11-12T04:56:12+00:00

The request function performs a simple check if the clock with the
provided ID is present or not. This is done with a simple call to
clk_get_by_id(). A non-zero return value indicates that the requested
clock is not available.

In some cases, clk->dev points to the clock bank device instead of
the clock device. This pointer is therefore overwritten in order to
reference to the correct device instance.

Signed-off-by: Kaustabh Chakraborty 
Signed-off-by: Minkyu Kang