clocksource/drivers/ingenic: Add support for the Ingenic X1000 OST.

X1000 and SoCs after X1000 (such as X1500 and X1830) had a separate
OST, it no longer belongs to TCU. This driver will register both a
clocksource and a sched_clock to the system.

Tested-by: 周正 (Zhou Zheng) <sernia.zhou@foxmail.com>
Co-developed-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>
Signed-off-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@ingenic.com>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200722171804.97559-3-zhouyanjie@wanyeetech.com

drivers/clocksource/Kconfig

@@ -697,8 +697,18 @@ config INGENIC_TIMER
 	help
 	  Support for the timer/counter unit of the Ingenic JZ SoCs.
 
+config INGENIC_SYSOST
+	bool "Clocksource/timer using the SYSOST in Ingenic X SoCs"
+	depends on MIPS || COMPILE_TEST
+	depends on COMMON_CLK
+	select MFD_SYSCON
+	select TIMER_OF
+	select IRQ_DOMAIN
+	help
+	  Support for the SYSOST of the Ingenic X Series SoCs.
+
 config INGENIC_OST
-	bool "Clocksource for Ingenic OS Timer"
+	bool "Clocksource using the OST in Ingenic JZ SoCs"
 	depends on MIPS || COMPILE_TEST
 	depends on COMMON_CLK
 	select MFD_SYSCON

drivers/clocksource/Makefile

@@ -82,6 +82,7 @@ obj-$(CONFIG_H8300_TMR8)		+= h8300_timer8.o
 obj-$(CONFIG_H8300_TMR16)		+= h8300_timer16.o
 obj-$(CONFIG_H8300_TPU)			+= h8300_tpu.o
 obj-$(CONFIG_INGENIC_OST)		+= ingenic-ost.o
+obj-$(CONFIG_INGENIC_SYSOST)	+= ingenic-sysost.o
 obj-$(CONFIG_INGENIC_TIMER)		+= ingenic-timer.o
 obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o