stm32mp: stpmic1: remove the debug unit request by debugger

Depending on backup register value, U-Boot SPL maintains the debug unit
powered-on for debugging purpose; only BUCK1 is required for powering
the debug unit, so revert the setting for all the other power lanes,
except BUCK3 that has to be always on.

To be functional this patch requires a modification in the debugger
,openocd for example, to update the STM32MP15 backup register when it is
required to debug SPL after reset. After deeper analysis this behavior
will be never supported in tools so the associated code, will be never
used and the associated code can be removed.

Signed-off-by: Patrick Delaunay <[email protected]>
Reviewed-by: Patrice Chotard <[email protected]>

Author: patrickdelaunay

arch/arm/mach-stm32mp/include/mach/stm32.h

@@ -135,7 +135,6 @@ enum boot_device {
 #define TAMP_BOOT_DEVICE_MASK		GENMASK(7, 4)
 #define TAMP_BOOT_INSTANCE_MASK		GENMASK(3, 0)
 #define TAMP_BOOT_FORCED_MASK		GENMASK(7, 0)
-#define TAMP_BOOT_DEBUG_ON		BIT(16)
 
 enum forced_boot_mode {
 	BOOT_NORMAL = 0x00,

board/st/common/stpmic1.c

@@ -202,18 +202,4 @@ void stpmic1_init(u32 voltage_mv)
 			STPMIC1_BUCKS_MRST_CR,
 			STPMIC1_MRST_BUCK(STPMIC1_BUCK3),
 			STPMIC1_MRST_BUCK(STPMIC1_BUCK3));
-
-	/* Check if debug is enabled to program PMIC according to the bit */
-	if (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_DEBUG_ON) {
-		log_info("Keep debug unit ON\n");
-
-		pmic_clrsetbits(dev, STPMIC1_BUCKS_MRST_CR,
-				STPMIC1_MRST_BUCK_DEBUG,
-				STPMIC1_MRST_BUCK_DEBUG);
-
-		if (STPMIC1_MRST_LDO_DEBUG)
-			pmic_clrsetbits(dev, STPMIC1_LDOS_MRST_CR,
-					STPMIC1_MRST_LDO_DEBUG,
-					STPMIC1_MRST_LDO_DEBUG);
-	}
 }

include/power/stpmic1.h

@@ -23,12 +23,9 @@
 
 /* BUCKS_MRST_CR */
 #define STPMIC1_MRST_BUCK(buck)		BIT(buck)
-#define STPMIC1_MRST_BUCK_DEBUG		(STPMIC1_MRST_BUCK(STPMIC1_BUCK1) | \
-					 STPMIC1_MRST_BUCK(STPMIC1_BUCK3))
 
 /* LDOS_MRST_CR */
 #define STPMIC1_MRST_LDO(ldo)		BIT(ldo)
-#define STPMIC1_MRST_LDO_DEBUG		0
 
 /* BUCKx_MAIN_CR (x=1...4) */
 #define STPMIC1_BUCK_ENA		BIT(0)