[v3,0/4] drivers: clk: renesas: ignore all clocks which is assinged to non Linux system

Message

Kuninori Morimoto Nov. 30, 2023, 2:14 a.m. UTC

Hi Rob, Geert
Cc Aymeric, Goda-san

This is v3 of ignoring non Linux system assinged device.

Some board might use Linux and another OS in the same time. In such
case, current Linux will stop necessary module clock when booting
which is not used on Linux side, but is used on another OS side.

To avoid such situation, this patch-set try to find status = "reserved"
devices, and add CLK_IGNORE_UNUSED flag to its clock.

Table 2.4: Values for status property
https://github.com/devicetree-org/devicetree-specification/releases/download/v0.4/devicetree-specification-v0.4.pdf

"reserved"
	Indicates that the device is operational, but should not be
	used. Typically this is used for devices that are controlled
	by another software component, such as platform firmware.

[1/4] - [3/4] : expand existing function for "reserved"
[4/4]         : adjust to "reserved" device on Renesas CPG

v2 -> v3
	- "__of_get_next_status_child()" -> "of_get_next_status_child()"
	- add Reviewed-by from Rob

v1 -> v2
	- remove "default_ret" from __of_device_is_status()
	- add new parameter explanation on cpg_mssr_priv

Kuninori Morimoto (4):
  of: add __of_device_is_status() and makes more generic status check
  of: add of_get_next_status_child() and makes more generic of_get_next
  of: add for_each_reserved_child_of_node()
  drivers: clk: renesas: ignore all clocks which is assinged to non Linux system

 drivers/clk/renesas/renesas-cpg-mssr.c | 118 +++++++++++++++++++++++--
 drivers/of/base.c                      | 111 ++++++++++++++++-------
 include/linux/of.h                     |  11 +++
 3 files changed, 201 insertions(+), 39 deletions(-)