[PATCH] serial: msm: select PM_OPP

[Dmitry Sinyavin]

Commit 173ebdedcd84 ("serial: msm: Use OPP table for DVFS support")
made the MSM serial driver unconditionally configure the core clock
through the OPP framework during probe.

When CONFIG_PM_OPP is disabled, devm_pm_opp_set_clkname() is a stub that
returns -EOPNOTSUPP, so every MSM serial port fails to probe. Select
PM_OPP to keep minimal configurations functional.

Fixes: 173ebdedcd84 ("serial: msm: Use OPP table for DVFS support")
Signed-off-by: Dmitry Sinyavin <sinyavin@xxxxxxxxx>
---
Tested with an ARM multi_v7_defconfig after forcing SERIAL_MSM=y and
PM_OPP=n. olddefconfig selected PM_OPP=y, and msm_serial.o built with
Clang and W=1.

 drivers/tty/serial/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index cf7dba473b20..bf680d22199b 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -904,6 +904,7 @@ config SERIAL_JSM
 config SERIAL_MSM
 	tristate "MSM on-chip serial port support"
 	depends on ARCH_QCOM || COMPILE_TEST
+	select PM_OPP
 	select SERIAL_CORE
 
 config SERIAL_MSM_CONSOLE

base-commit: 45c13f3f9e3bb15fd89ff2864c6f627a3b4b4229
-- 
2.53.0