[PATCH v2 11/12] soc: starfive: Add socinfo driver for JHB100 SoC
Conor Dooley
conor at kernel.org
Tue May 12 10:45:23 PDT 2026
On Tue, May 12, 2026 at 01:35:20AM -0700, Changhuang Liang wrote:
> 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/
FWIW, this is not what I asked for in v1, this should remain the full
path to the driver. I wanted you to add this directory back to the
"STARFIVE SOC DRIVERS" entry, since it's me that'll be applying patches
for this driver.
> +
> 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);
Does this really need to be an early initcall btw?
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