clk: keystone: sci-clk: probe clocks from DT instead of firmware

Probing all the available clocks from the PM firmware takes quite a lot
of time, increasing boot time. Instead, implement functionality that
parses only the used clocks from DT, and registers these to clock core.
This way, the boot time is greatly improved.

Additionally, provide a Kconfig option for parsing all the clocks from
firmware, if someone requires this. It is mostly useful as a debugging
functionality if we want to inspect the whole clock tree.

Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tero Kristo <t-kristo@ti.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/clk/keystone/Kconfig b/drivers/clk/keystone/Kconfig
index b04927d06cd1..aaaee7d1c126 100644
--- a/drivers/clk/keystone/Kconfig
+++ b/drivers/clk/keystone/Kconfig
@@ -14,3 +14,14 @@ config TI_SCI_CLK
 	  This adds the clock driver support over TI System Control Interface.
 	  If you wish to use clock resources from the PMMC firmware, say Y.
 	  Otherwise, say N.
+
+config TI_SCI_CLK_PROBE_FROM_FW
+	bool "Probe available clocks from firmware"
+	depends on TI_SCI_CLK
+	default n
+	help
+	  Forces the TI SCI clock driver to probe available clocks from the
+	  firmware. By default, only the used clocks are probed from DT.
+	  This is mostly only useful for debugging purposes, and will
+	  increase the boot time of the device. If you want the clocks probed
+	  from firmware, say Y. Otherwise, say N.