soc/mediatek/mt8195: Add clk_buf driver

Both mt8192 and mt8195 use mt6359p clk_buf.
But mt8195 clk_buf uses legacy co-clock mode without srclken_rc.

Signed-off-by: Yuchen Huang <yuchen.huang@mediatek.corp-partner.google.com>
Change-Id: Ie9ee91449a7a14e77231493f807b321b2dbaa6a6
Signed-off-by: Yidi Lin <yidi.lin@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/53896
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/mainboard/google/cherry/romstage.c

@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <arch/stages.h>
+#include <soc/clkbuf.h>
 #include <soc/mt6315.h>
 #include <soc/mt6359p.h>
 #include <soc/pmif.h>
@@ -10,4 +11,5 @@ void platform_romstage_main(void)
 	mtk_pmif_init();
 	mt6359p_init();
 	mt6315_init();
+	clk_buf_init();
 }

src/soc/mediatek/common/clkbuf.c

@@ -5,8 +5,9 @@
 #include <device/mmio.h>
 #include <soc/clkbuf.h>
 #include <soc/pmif.h>
+#if CONFIG(SRCLKEN_RC_SUPPORT)
 #include <soc/srclken_rc.h>
-
+#endif
 
 #define BUFTAG			"[CLKBUF]"
 #define buf_info(fmt, arg ...)	printk(BIOS_INFO, BUFTAG "%s,%d: " fmt, \

src/soc/mediatek/common/include/soc/clkbuf.h

@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#ifndef SOC_MEDIATEK_MT8192_CLKBUF_H
+#ifndef SOC_MEDIATEK_COMMON_CLKBUF_H
-#define SOC_MEDIATEK_MT8192_CLKBUF_H
+#define SOC_MEDIATEK_COMMON_CLKBUF_H
 
 #include <device/mmio.h>
 
@@ -66,4 +66,4 @@ DEFINE_BITFIELD(PMIC_RG_XO_VOTE, 10, 0)
 
 int clk_buf_init(void);
 
-#endif /* SOC_MEDIATEK_MT8192_CLKBUF_H */
+#endif /* SOC_MEDIATEK_COMMON_CLKBUF_H */

src/soc/mediatek/mt8192/Makefile.inc

@@ -23,7 +23,7 @@ verstage-y += ../common/uart.c
 
 romstage-y += ../common/auxadc.c
 romstage-y += ../common/cbmem.c
-romstage-y += clkbuf.c srclken_rc.c
+romstage-y += ../common/clkbuf.c srclken_rc.c
 romstage-y += ../common/dram_init.c
 romstage-y += ../common/dramc_param.c
 romstage-y += ../common/flash_controller.c

src/soc/mediatek/mt8195/Makefile.inc

@@ -20,6 +20,7 @@ verstage-y += ../common/uart.c
 verstage-y += ../common/wdt.c
 
 romstage-y += ../common/cbmem.c
+romstage-y += ../common/clkbuf.c
 romstage-y += emi.c
 romstage-y += ../common/flash_controller.c
 romstage-y += ../common/gpio.c gpio.c