[PATCH v2 11/12] soc: starfive: Add socinfo driver for JHB100 SoC
Changhuang Liang
changhuang.liang at starfivetech.com
Tue May 12 01:35:20 PDT 2026
Add socinfo driver for JHB100 SoC. Currently available for distinguishing
between the two reversions, A0 and A1.
Signed-off-by: Changhuang Liang <changhuang.liang at starfivetech.com>
---
MAINTAINERS | 5 ++
drivers/soc/Kconfig | 1 +
drivers/soc/Makefile | 1 +
drivers/soc/starfive/Kconfig | 6 ++
drivers/soc/starfive/Makefile | 2 +
drivers/soc/starfive/socinfo/Kconfig | 11 +++
drivers/soc/starfive/socinfo/Makefile | 2 +
drivers/soc/starfive/socinfo/jhb100-socinfo.c | 80 +++++++++++++++++++
8 files changed, 108 insertions(+)
create mode 100644 drivers/soc/starfive/Kconfig
create mode 100644 drivers/soc/starfive/Makefile
create mode 100644 drivers/soc/starfive/socinfo/Kconfig
create mode 100644 drivers/soc/starfive/socinfo/Makefile
create mode 100644 drivers/soc/starfive/socinfo/jhb100-socinfo.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 6f6aac7cea95..66175f453d20 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -25613,6 +25613,11 @@ S: Maintained
F: drivers/reset/starfive/reset-starfive-jhb1*
F: include/dt-bindings/reset/starfive,jhb1*.h
+STARFIVE JHB100 SOCINFO DRIVER
+M: Changhuang Liang <changhuang.liang at starfivetech.com>
+S: Maintained
+F: drivers/soc/starfive/
+
STARFIVE JHB100 SYSCON
M: Changhuang Liang <changhuang.liang at starfivetech.com>
S: Maintained
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index a2d65adffb80..b3b01fc38139 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -24,6 +24,7 @@ source "drivers/soc/renesas/Kconfig"
source "drivers/soc/rockchip/Kconfig"
source "drivers/soc/samsung/Kconfig"
source "drivers/soc/sophgo/Kconfig"
+source "drivers/soc/starfive/Kconfig"
source "drivers/soc/sunxi/Kconfig"
source "drivers/soc/tegra/Kconfig"
source "drivers/soc/ti/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index c9e689080ceb..009f85ff891a 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -30,6 +30,7 @@ obj-y += renesas/
obj-y += rockchip/
obj-$(CONFIG_SOC_SAMSUNG) += samsung/
obj-y += sophgo/
+obj-y += starfive/
obj-y += sunxi/
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-y += ti/
diff --git a/drivers/soc/starfive/Kconfig b/drivers/soc/starfive/Kconfig
new file mode 100644
index 000000000000..04b020083d3e
--- /dev/null
+++ b/drivers/soc/starfive/Kconfig
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "StarFive SoC (System On Chip) specific Drivers"
+
+source "drivers/soc/starfive/socinfo/Kconfig"
+
+endmenu
diff --git a/drivers/soc/starfive/Makefile b/drivers/soc/starfive/Makefile
new file mode 100644
index 000000000000..ca1e609b8104
--- /dev/null
+++ b/drivers/soc/starfive/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y += socinfo/
diff --git a/drivers/soc/starfive/socinfo/Kconfig b/drivers/soc/starfive/socinfo/Kconfig
new file mode 100644
index 000000000000..92bbab62895b
--- /dev/null
+++ b/drivers/soc/starfive/socinfo/Kconfig
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config STARFIVE_JHB100_SOCINFO
+ bool "StarFive JHB100 SoC Information"
+ depends on ARCH_STARFIVE || COMPILE_TEST
+ select SOC_BUS
+ default y
+ help
+ Include support for the SoC bus socinfo for the StarFive JHB100 SoC
+ platforms to provide information about the SoC family and variant
+ to user space.
diff --git a/drivers/soc/starfive/socinfo/Makefile b/drivers/soc/starfive/socinfo/Makefile
new file mode 100644
index 000000000000..26c2bdf1de3b
--- /dev/null
+++ b/drivers/soc/starfive/socinfo/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_STARFIVE_JHB100_SOCINFO) += jhb100-socinfo.o
diff --git a/drivers/soc/starfive/socinfo/jhb100-socinfo.c b/drivers/soc/starfive/socinfo/jhb100-socinfo.c
new file mode 100644
index 000000000000..9c5826d7c253
--- /dev/null
+++ b/drivers/soc/starfive/socinfo/jhb100-socinfo.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2025 StarFive Technology Co., Ltd.
+ *
+ * Author: Changhuang Liang <changhuang.liang at starfivetech.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/init.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/sys_soc.h>
+
+#define JHB100_REV_ID 0x38
+#define JHB100_REV_ID_CHAR GENMASK(3, 2)
+#define JHB100_REV_ID_NUM GENMASK(1, 0)
+
+static int __init starfive_socinfo_init(void)
+{
+ struct soc_device_attribute *attrs;
+ struct soc_device *soc_dev;
+ const char *machine = NULL;
+ struct device_node *np;
+ struct regmap *regmap;
+ char rev_char;
+ u32 rev_id;
+ int ret;
+
+ np = of_find_compatible_node(NULL, NULL, "starfive,jhb100-sys0-syscon");
+ if (!of_device_is_available(np)) {
+ of_node_put(np);
+ return -ENODEV;
+ }
+
+ regmap = syscon_node_to_regmap(np);
+ if (IS_ERR(regmap)) {
+ of_node_put(np);
+ return PTR_ERR(regmap);
+ }
+
+ ret = regmap_read(regmap, JHB100_REV_ID, &rev_id);
+ if (ret) {
+ of_node_put(np);
+ return ret;
+ }
+
+ of_node_put(np);
+
+ rev_char = (char)FIELD_GET(JHB100_REV_ID_CHAR, rev_id) + 'A';
+ rev_id = (u32)FIELD_GET(JHB100_REV_ID_NUM, rev_id);
+
+ attrs = kzalloc_obj(*attrs);
+ if (!attrs)
+ return -ENOMEM;
+
+ np = of_find_node_by_path("/");
+ of_property_read_string(np, "model", &machine);
+ if (machine)
+ attrs->machine = kstrdup(machine, GFP_KERNEL);
+ of_node_put(np);
+
+ attrs->revision = kasprintf(GFP_KERNEL, "%c%u", rev_char, rev_id);
+ attrs->family = "JH";
+ attrs->soc_id = "JHB100";
+
+ soc_dev = soc_device_register(attrs);
+ if (IS_ERR(soc_dev)) {
+ kfree(attrs->revision);
+ kfree(attrs->machine);
+ kfree(attrs);
+ return PTR_ERR(soc_dev);
+ }
+
+ pr_info("StarFive %s SoC rev(%s)\n", attrs->soc_id, attrs->revision);
+
+ return 0;
+}
+
+early_initcall(starfive_socinfo_init);
--
2.25.1
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