[PATCH v3 0/3] nvmem: s32g-ocotp: Add driver for S32G OCOTP

[PATCH v3 0/3] nvmem: s32g-ocotp: Add driver for S32G OCOTP

[Dan Carpenter]

This driver provides a way to access the On Chip One-Time Programmable
Controller (OCOTP) on the s32g chipset.  There are three versions of this
chip but they're compatible.

v3: Mostly small cleanups.  Re-order device tree entries.  Remove unused
    label.  Use dev_err_probe().

v2: Major cleanups to device tree.  Fix sign-offs.  Re-write driver using
    keepouts.

Ciprian Costea (2):
  dt-bindings: nvmem: Add the nxp,s32g-ocotp yaml file
  nvmem: s32g-ocotp: Add driver for S32G OCOTP

Dan Carpenter (1):
  arm64: dts: s32g: Add device tree information for the OCOTP driver

 .../bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml  |  45 ++++++++
 arch/arm64/boot/dts/freescale/s32g2.dtsi      |   7 ++
 arch/arm64/boot/dts/freescale/s32g3.dtsi      |   7 ++
 drivers/nvmem/Kconfig                         |  10 ++
 drivers/nvmem/Makefile                        |   2 +
 drivers/nvmem/s32g-ocotp-nvmem.c              | 100 ++++++++++++++++++
 6 files changed, 171 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml
 create mode 100644 drivers/nvmem/s32g-ocotp-nvmem.c

-- 
2.47.2

[PATCH v3 1/3] dt-bindings: nvmem: Add the nxp,s32g-ocotp yaml file

[Dan Carpenter]

From: Ciprian Costea <ciprianmarian.costea@nxp.com>

Add bindings to expose the On Chip One-Time Programmable Controller
(OCOTP) for the NXP s32g chipset.  There are three versions of this
chip but they're compatible so we can fall back to the nxp,s32g2-ocotp
compatible.

Signed-off-by: Ciprian Costea <ciprianmarian.costea@nxp.com>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
v3: Remove unnecessary |
    Move $ref to end
    Alphabetize the compatibles
    Delete the unused ocotp: label

v2: dt_binding_check DT_SCHEMA_FILES=nxp,s32g-ocotp-nvmem.yaml is clean
    make CHECK_DTBS=y freescale/*.dtb is clean.  Particularly the
      freescale/s32g274a-evb.dtb file which Rob mentioned.
    remove bogus include file
    remove redundant "reg" description
    remove #address-cells and #size-cells since they are already in
    nvmem.yaml
    Fix email From header
---
 .../bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml  | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml b/Documentation/devicetree/bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml
new file mode 100644
index 000000000000..8d46e7d28da6
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml
@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/nxp,s32g-ocotp-nvmem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP S32G OCOTP NVMEM driver
+
+maintainers:
+  - Ciprian Costea <ciprianmarian.costea@nxp.com>
+
+description:
+  The drivers provides an interface to access One Time
+  Programmable memory pages, such as TMU fuse values.
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - nxp,s32g2-ocotp
+      - items:
+          - enum:
+              - nxp,s32g3-ocotp
+              - nxp,s32r45-ocotp
+          - const: nxp,s32g2-ocotp
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+allOf:
+  - $ref: nvmem.yaml#
+
+examples:
+  - |
+    nvmem@400a4000 {
+      compatible = "nxp,s32g2-ocotp";
+      reg = <0x400a4000 0x400>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+    };
-- 
2.47.2

[PATCH v3 2/3] nvmem: s32g-ocotp: Add driver for S32G OCOTP

[Dan Carpenter]

From: Ciprian Costea <ciprianmarian.costea@nxp.com>

Provide access to the On Chip One-Time Programmable Controller (OCOTP)
pages on the NXP S32G platform.

Signed-off-by: Ciprian Costea <ciprianmarian.costea@nxp.com>
Co-developed-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
Co-developed-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
v3: Use dev_err_probe()
v2: Add S-o-b tags for Ghennadi and Larisa.

    Use keepouts instead of the s32g_map[] table.  This allows a bunch
    of code to be deleted.

    Version 1 only let one word (S32G_OCOTP_WORD_SIZE or 4) to be read
    at a time, but now the driver allows larger reads.  Set the
    .word_size in s32g_ocotp_nvmem_config to be 4 instead.

    Krzysztof asked for some changes in the probe() function but that
    code was deleted instead.
---
 drivers/nvmem/Kconfig            |  10 ++++
 drivers/nvmem/Makefile           |   2 +
 drivers/nvmem/s32g-ocotp-nvmem.c | 100 +++++++++++++++++++++++++++++++
 3 files changed, 112 insertions(+)
 create mode 100644 drivers/nvmem/s32g-ocotp-nvmem.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 0bdd86d74f62..55016f803492 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -240,6 +240,16 @@ config NVMEM_NINTENDO_OTP
 	  This driver can also be built as a module. If so, the module
 	  will be called nvmem-nintendo-otp.
 
+config NVMEM_S32G_OCOTP
+	tristate "S32G SoC OCOTP support"
+	depends on ARCH_S32
+	help
+	  This is a driver for the 'OCOTP' peripheral available on S32G
+	  platforms.
+
+	  If you say Y here, you will get support for the One Time
+	  Programmable memory pages.
+
 config NVMEM_QCOM_QFPROM
 	tristate "QCOM QFPROM Support"
 	depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 84fef48b7ff6..e01bb4ad612a 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -79,6 +79,8 @@ obj-$(CONFIG_NVMEM_SUNPLUS_OCOTP)	+= nvmem_sunplus_ocotp.o
 nvmem_sunplus_ocotp-y			:= sunplus-ocotp.o
 obj-$(CONFIG_NVMEM_SUNXI_SID)		+= nvmem_sunxi_sid.o
 nvmem_sunxi_sid-y			:= sunxi_sid.o
+obj-$(CONFIG_NVMEM_S32G_OCOTP)		+= nvmem-s32g-ocotp-nvmem.o
+nvmem-s32g-ocotp-nvmem-y		:= s32g-ocotp-nvmem.o
 obj-$(CONFIG_NVMEM_U_BOOT_ENV)		+= nvmem_u-boot-env.o
 nvmem_u-boot-env-y			:= u-boot-env.o
 obj-$(CONFIG_NVMEM_UNIPHIER_EFUSE)	+= nvmem-uniphier-efuse.o
diff --git a/drivers/nvmem/s32g-ocotp-nvmem.c b/drivers/nvmem/s32g-ocotp-nvmem.c
new file mode 100644
index 000000000000..119871ab3a94
--- /dev/null
+++ b/drivers/nvmem/s32g-ocotp-nvmem.c
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2023-2025 NXP
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/nvmem-provider.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+struct s32g_ocotp_priv {
+	struct device *dev;
+	void __iomem *base;
+};
+
+static int s32g_ocotp_read(void *context, unsigned int offset,
+			    void *val, size_t bytes)
+{
+	struct s32g_ocotp_priv *s32g_data = context;
+	u32 *dst = val;
+
+	while (bytes >= sizeof(u32)) {
+		*dst++ = ioread32(s32g_data->base + offset);
+
+		bytes -= sizeof(u32);
+		offset += sizeof(u32);
+	}
+
+	return 0;
+}
+
+static struct nvmem_keepout s32g_keepouts[] = {
+	{ .start = 0,   .end = 520 },
+	{ .start = 540, .end = 564 },
+	{ .start = 596, .end = 664 },
+	{ .start = 668, .end = 676 },
+	{ .start = 684, .end = 732 },
+	{ .start = 744, .end = 864 },
+	{ .start = 908, .end = 924 },
+	{ .start = 928, .end = 936 },
+	{ .start = 948, .end = 964 },
+	{ .start = 968, .end = 976 },
+	{ .start = 984, .end = 1012 },
+};
+
+static struct nvmem_config s32g_ocotp_nvmem_config = {
+	.name = "s32g-ocotp",
+	.add_legacy_fixed_of_cells = true,
+	.read_only = true,
+	.word_size = 4,
+	.reg_read = s32g_ocotp_read,
+	.keepout = s32g_keepouts,
+	.nkeepout = ARRAY_SIZE(s32g_keepouts),
+};
+
+static const struct of_device_id ocotp_of_match[] = {
+	{ .compatible = "nxp,s32g2-ocotp" },
+	{ /* sentinel */ }
+};
+
+static int s32g_ocotp_probe(struct platform_device *pdev)
+{
+	struct s32g_ocotp_priv *s32g_data;
+	struct device *dev = &pdev->dev;
+	struct nvmem_device *nvmem;
+	struct resource *res;
+
+	s32g_data = devm_kzalloc(dev, sizeof(*s32g_data), GFP_KERNEL);
+	if (!s32g_data)
+		return -ENOMEM;
+
+	s32g_data->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(s32g_data->base))
+		return dev_err_probe(dev, PTR_ERR(s32g_data->base),
+				     "Cannot map OCOTP device.\n");
+
+	s32g_data->dev = dev;
+	s32g_ocotp_nvmem_config.dev = dev;
+	s32g_ocotp_nvmem_config.priv = s32g_data;
+	s32g_ocotp_nvmem_config.size = resource_size(res);
+
+	nvmem = devm_nvmem_register(dev, &s32g_ocotp_nvmem_config);
+
+	return PTR_ERR_OR_ZERO(nvmem);
+}
+
+static struct platform_driver s32g_ocotp_driver = {
+	.probe = s32g_ocotp_probe,
+	.driver = {
+		.name = "s32g-ocotp",
+		.of_match_table = ocotp_of_match,
+	},
+};
+module_platform_driver(s32g_ocotp_driver);
+MODULE_AUTHOR("NXP");
+MODULE_DESCRIPTION("S32G OCOTP driver");
+MODULE_LICENSE("GPL");
-- 
2.47.2

[PATCH v3 3/3] arm64: dts: s32g: Add device tree information for the OCOTP driver

[Dan Carpenter]

Add the device tree information for the S32G On Chip One-Time
Programmable Controller (OCOTP) chip.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
v3: Add the device tree entry in the correct location based on
    the 0x400a4000 address.
v2: change "ocotp: ocotp@400a4000 {" to "ocotp: nvmem@400a4000 {"
---
 arch/arm64/boot/dts/freescale/s32g2.dtsi | 7 +++++++
 arch/arm64/boot/dts/freescale/s32g3.dtsi | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/s32g2.dtsi b/arch/arm64/boot/dts/freescale/s32g2.dtsi
index 6a7cc7b33754..d6a9f61394d3 100644
--- a/arch/arm64/boot/dts/freescale/s32g2.dtsi
+++ b/arch/arm64/boot/dts/freescale/s32g2.dtsi
@@ -355,6 +355,13 @@ serdes_presence: serdes-presence@100 {
 			};
 		};
 
+		ocotp: nvmem@400a4000 {
+			compatible = "nxp,s32g2-ocotp";
+			reg = <0x400a4000 0x400>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
 		edma0: dma-controller@40144000 {
 			compatible = "nxp,s32g2-edma";
 			reg = <0x40144000 0x24000>,
diff --git a/arch/arm64/boot/dts/freescale/s32g3.dtsi b/arch/arm64/boot/dts/freescale/s32g3.dtsi
index 61ee08f0cfdc..f0e2a2907431 100644
--- a/arch/arm64/boot/dts/freescale/s32g3.dtsi
+++ b/arch/arm64/boot/dts/freescale/s32g3.dtsi
@@ -408,6 +408,13 @@ serdes_presence: serdes-presence@100 {
 			};
 		};
 
+		ocotp: nvmem@400a4000 {
+			compatible = "nxp,s32g3-ocotp", "nxp,s32g2-ocotp";
+			reg = <0x400a4000 0x400>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+		};
+
 		edma0: dma-controller@40144000 {
 			compatible = "nxp,s32g3-edma", "nxp,s32g2-edma";
 			reg = <0x40144000 0x24000>,
-- 
2.47.2

Re: [PATCH v3 1/3] dt-bindings: nvmem: Add the nxp,s32g-ocotp yaml file

[Rob Herring (Arm)]

On Tue, 02 Sep 2025 12:47:45 +0300, Dan Carpenter wrote:
> From: Ciprian Costea <ciprianmarian.costea@nxp.com>
> 
> Add bindings to expose the On Chip One-Time Programmable Controller
> (OCOTP) for the NXP s32g chipset.  There are three versions of this
> chip but they're compatible so we can fall back to the nxp,s32g2-ocotp
> compatible.
> 
> Signed-off-by: Ciprian Costea <ciprianmarian.costea@nxp.com>
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
> v3: Remove unnecessary |
>     Move $ref to end
>     Alphabetize the compatibles
>     Delete the unused ocotp: label
> 
> v2: dt_binding_check DT_SCHEMA_FILES=nxp,s32g-ocotp-nvmem.yaml is clean
>     make CHECK_DTBS=y freescale/*.dtb is clean.  Particularly the
>       freescale/s32g274a-evb.dtb file which Rob mentioned.
>     remove bogus include file
>     remove redundant "reg" description
>     remove #address-cells and #size-cells since they are already in
>     nvmem.yaml
>     Fix email From header
> ---
>  .../bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml  | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/nvmem/nxp,s32g-ocotp-nvmem.yaml
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>