mfd: rohm-bd96801: Support ROHM BD96802

The ROHM BD96802 PMIC looks from software point of view a lot like ROHM
BD96801 PMIC. Just with reduced number of voltage rails. Both PMICs
provide two physical IRQ lines referred as INTB and ERRB and contain
blocks implementing regulator controls and a weatchdog. Hence it makes
sense to use same MFD core for both PMICs.

Add support for ROHM BD96802 scalable companion PMIC to the BD96801
core driver.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/05957d194425a79a4f35f287695c3d9ca2ed1ae2.1744090658.git.mazziesaccount@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>

3 files changed, 77 insertions, 0 deletions

diff --git a/include/linux/mfd/rohm-bd96801.h b/include/linux/mfd/rohm-bd96801.h
index e2d9e10b6364..68c8ac8ad409 100644
--- a/include/linux/mfd/rohm-bd96801.h
+++ b/include/linux/mfd/rohm-bd96801.h
@@ -40,7 +40,9 @@
  * INTB status registers are at range 0x5c ... 0x63
  */
 #define BD96801_REG_INT_SYS_ERRB1	0x52
+#define BD96801_REG_INT_BUCK2_ERRB	0x56
 #define BD96801_REG_INT_SYS_INTB	0x5c
+#define BD96801_REG_INT_BUCK2_INTB	0x5e
 #define BD96801_REG_INT_LDO7_INTB	0x63
 
 /* MASK registers */
diff --git a/include/linux/mfd/rohm-bd96802.h b/include/linux/mfd/rohm-bd96802.h
new file mode 100644
index 000000000000..bf4b77944edf
--- /dev/null
+++ b/include/linux/mfd/rohm-bd96802.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2025 ROHM Semiconductors
+ *
+ * The digital interface of trhe BD96802 PMIC is a reduced version of the
+ * BD96801. Hence the BD96801 definitions are used for registers and masks
+ * while this header only holds the IRQ definitions - mainly to avoid gaps in
+ * IRQ numbers caused by the lack of some BUCKs / LDOs and their respective
+ * IRQs.
+ */
+
+#ifndef __LINUX_MFD_BD96802_H__
+#define __LINUX_MFD_BD96802_H__
+
+/* ERRB IRQs */
+enum {
+	/* Reg 0x52, 0x53, 0x54 - ERRB system IRQs */
+	BD96802_OTP_ERR_STAT,
+	BD96802_DBIST_ERR_STAT,
+	BD96802_EEP_ERR_STAT,
+	BD96802_ABIST_ERR_STAT,
+	BD96802_PRSTB_ERR_STAT,
+	BD96802_DRMOS1_ERR_STAT,
+	BD96802_DRMOS2_ERR_STAT,
+	BD96802_SLAVE_ERR_STAT,
+	BD96802_VREF_ERR_STAT,
+	BD96802_TSD_ERR_STAT,
+	BD96802_UVLO_ERR_STAT,
+	BD96802_OVLO_ERR_STAT,
+	BD96802_OSC_ERR_STAT,
+	BD96802_PON_ERR_STAT,
+	BD96802_POFF_ERR_STAT,
+	BD96802_CMD_SHDN_ERR_STAT,
+	BD96802_INT_SHDN_ERR_STAT,
+
+	/* Reg 0x55 BUCK1 ERR IRQs */
+	BD96802_BUCK1_PVIN_ERR_STAT,
+	BD96802_BUCK1_OVP_ERR_STAT,
+	BD96802_BUCK1_UVP_ERR_STAT,
+	BD96802_BUCK1_SHDN_ERR_STAT,
+
+	/* Reg 0x56 BUCK2 ERR IRQs */
+	BD96802_BUCK2_PVIN_ERR_STAT,
+	BD96802_BUCK2_OVP_ERR_STAT,
+	BD96802_BUCK2_UVP_ERR_STAT,
+	BD96802_BUCK2_SHDN_ERR_STAT,
+};
+
+/* INTB IRQs */
+enum {
+	/* Reg 0x5c (System INTB) */
+	BD96802_TW_STAT,
+	BD96802_WDT_ERR_STAT,
+	BD96802_I2C_ERR_STAT,
+	BD96802_CHIP_IF_ERR_STAT,
+
+	/* Reg 0x5d (BUCK1 INTB) */
+	BD96802_BUCK1_OCPH_STAT,
+	BD96802_BUCK1_OCPL_STAT,
+	BD96802_BUCK1_OCPN_STAT,
+	BD96802_BUCK1_OVD_STAT,
+	BD96802_BUCK1_UVD_STAT,
+	BD96802_BUCK1_TW_CH_STAT,
+
+	/* Reg 0x5e (BUCK2 INTB) */
+	BD96802_BUCK2_OCPH_STAT,
+	BD96802_BUCK2_OCPL_STAT,
+	BD96802_BUCK2_OCPN_STAT,
+	BD96802_BUCK2_OVD_STAT,
+	BD96802_BUCK2_UVD_STAT,
+	BD96802_BUCK2_TW_CH_STAT,
+};
+
+#endif
diff --git a/include/linux/mfd/rohm-generic.h b/include/linux/mfd/rohm-generic.h
index e7d4e6afe388..11b86f9129e3 100644
--- a/include/linux/mfd/rohm-generic.h
+++ b/include/linux/mfd/rohm-generic.h
@@ -17,6 +17,7 @@ enum rohm_chip_type {
 	ROHM_CHIP_TYPE_BD71837,
 	ROHM_CHIP_TYPE_BD71847,
 	ROHM_CHIP_TYPE_BD96801,
+	ROHM_CHIP_TYPE_BD96802,
 	ROHM_CHIP_TYPE_AMOUNT
 };