soc: samsung: Add Exynos PMU driver
Add basic Power Management Unit (PMU) driver for Exynos SoCs. For now
it's only capable of changing UART path in PMU, which is needed for
E850-96 board. The driver's structure resembles the exynos-pmu driver
from Linux kernel, and although it's very basic and slim at the moment,
it can be easily extended in future if the need arises.
UCLASS_NOP is used, as there are no benefits in using more elaborate
classes like UCLASS_MISC in this case. The DM_FLAG_PROBE_AFTER_BIND flag
is added in bind function, as the probe function must be always called
for this driver.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/drivers/soc/samsung/Makefile b/drivers/soc/samsung/Makefile
index 833ac07..0eb3ed8 100644
--- a/drivers/soc/samsung/Makefile
+++ b/drivers/soc/samsung/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0+
+obj-$(CONFIG_EXYNOS_PMU) += exynos-pmu.o
obj-$(CONFIG_EXYNOS_USI) += exynos-usi.o