Merge https://gitlab.denx.de/u-boot/custodians/u-boot-riscv

- Sipeed Maix support S-mode.
- Provide command sbi.
- Use fdtdec_get_addr_size_auto_parent to get fu540 cache base address.
- Fix a compiler error with CONFIG_SPL_SMP=n.
- Fix sifive ram driver 32 compiler warnings.
- Fix kendryte/pll.h redefine nop() warning.

arch/riscv/cpu/fu540/cache.c

@@ -35,7 +35,8 @@ int cache_enable_ways(void)
 	if (node < 0)
 		return node;
 
-	base = fdtdec_get_addr(blob, node, "reg");
+	base = fdtdec_get_addr_size_auto_parent(blob, 0, node, "reg", 0,
+						NULL, false);
 	if (base == FDT_ADDR_T_NONE)
 		return FDT_ADDR_T_NONE;
 

arch/riscv/include/asm/sbi.h

@@ -115,6 +115,8 @@ void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
 				unsigned long asid);
 #endif
 void sbi_set_timer(uint64_t stime_value);
+long sbi_get_spec_version(void);
+int sbi_get_impl_id(void);
 int sbi_probe_extension(int ext);
 
 #endif

arch/riscv/lib/sbi.c

@@ -53,6 +53,42 @@ void sbi_set_timer(uint64_t stime_value)
 #endif
 }
 
+/**
+ * sbi_get_spec_version() - get current SBI specification version
+ *
+ * Return: version id
+ */
+long sbi_get_spec_version(void)
+{
+	struct sbiret ret;
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_SPEC_VERSION,
+			0, 0, 0, 0, 0, 0);
+	if (!ret.error)
+		if (ret.value)
+			return ret.value;
+
+	return -ENOTSUPP;
+}
+
+/**
+ * sbi_get_impl_id() - get SBI implementation ID
+ *
+ * Return: implementation ID
+ */
+int sbi_get_impl_id(void)
+{
+	struct sbiret ret;
+
+	ret = sbi_ecall(SBI_EXT_BASE, SBI_EXT_BASE_GET_IMP_ID,
+			0, 0, 0, 0, 0, 0);
+	if (!ret.error)
+		if (ret.value)
+			return ret.value;
+
+	return -ENOTSUPP;
+}
+
 /**
  * sbi_probe_extension() - Check if an SBI extension ID is supported or not.
  * @extid: The extension ID to be probed.

arch/riscv/lib/spl.c

@@ -39,7 +39,7 @@ void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
 {
 	typedef void __noreturn (*image_entry_riscv_t)(ulong hart, void *dtb);
 	void *fdt_blob;
-	int ret;
+	__maybe_unused int ret;
 
 #if CONFIG_IS_ENABLED(LOAD_FIT) || CONFIG_IS_ENABLED(LOAD_FIT_FULL)
 	fdt_blob = spl_image->fdt_addr;