[RFC PATCH 1/2] include: sbi_ecall_interface: Add defines for the RISC-V SBI watchdog extension

[Prajwal N]

Add the SBI watchdog extension ID and function IDs for supported
operations, including start, stop, pat, and attribute read and write.

Define the attribute IDs exposed by the SBI watchdog extension, including
watchdog capabilities such as MSI support and configurable watchdog
parameters.

Signed-off-by: Prajwal N <prajwal.n at oss.qualcomm.com>
---
 arch/riscv/include/asm/sbi.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
index 5725e0ca4dda..b67ee507c517 100644
--- a/arch/riscv/include/asm/sbi.h
+++ b/arch/riscv/include/asm/sbi.h
@@ -38,6 +38,7 @@ enum sbi_ext_id {
 	SBI_EXT_FWFT = 0x46574654,
 	SBI_EXT_MPXY = 0x4D505859,
 	SBI_EXT_DBTR = 0x44425452,
+	SBI_EXT_WDT = 0x574454,
 
 	/* Experimentals extensions must lie within this range */
 	SBI_EXT_EXPERIMENTAL_START = 0x08000000,
@@ -534,6 +535,31 @@ union sbi_dbtr_shmem_entry {
 	struct sbi_dbtr_id_msg id;
 };
 
+/* SBI watchdog function IDs */
+enum sbi_ext_wdt_fid {
+	SBI_EXT_WATCHDOG_READ_ATTRIBUTE = 0,
+	SBI_EXT_WATCHDOG_WRITE_ATTRIBUTE,
+	SBI_EXT_WATCHDOG_WRITE_NOTIF_MSI_MESSAGE,
+	SBI_EXT_WATCHDOG_START,
+	SBI_EXT_WATCHDOG_STOP,
+	SBI_EXT_WATCHDOG_PAT,
+};
+
+/* SBI watchdog attributes */
+enum sbi_ext_attribute_id {
+	SBI_WDT_CAPABILITY		= 0x00000000,
+	SBI_WDT_STATE			= 0x00000001,
+	SBI_WDT_MIN_PERIOD		= 0x00000002,
+	SBI_WDT_PERIOD			= 0x00000003,
+	SBI_WDT_TIME_LEFT		= 0x00000004,
+	SBI_WDT_NOTIF_TIME		= 0x00000005,
+	SBI_WDT_NOTIF_MSI_ADDR_LOW	= 0x00000006,
+	SBI_WDT_NOTIF_MSI_ADDR_HIGH	= 0x00000007,
+	SBI_WDT_NOTIF_MSI_DATA		= 0x00000008,
+	SBI_WDT_ATTR_MAX		= 0x00000009,
+	SBI_WDT_ATTR_RESERVED_MAX	= 0xFFFFFFFF
+};
+
 /* SBI spec version fields */
 #define SBI_SPEC_VERSION_DEFAULT	0x1
 #define SBI_SPEC_VERSION_MAJOR_SHIFT	24
-- 
2.43.0