[PATCH v3 0/3] Support AM62P silicon revision detection via uniphier-efuse

This series adds support for reading AM62P silicon revision from the
efuse GP_SW register. The solution reuses the  existing uniphier-efuse
driver by adding ti,am62p-efuse as a compatible string. The three patches
update the devicetree binding to document the new compatible, configure
the driver as mandatory builtin for K3 architectures, and extend the driver
to support AM62P devices. The uniphier-efuse driver is simple enough to be
reused for efuse register reads on the AM62P SoC.

Patches have been tested on AM62p SK hardware using SR1.0, SR1.1 and SR1.2
silicon.

Changes since v2:
- Add Kunihiko's review tag
- Update binding to include fallback compatible as per Conor's review [0]

Link to v2:
https://lore.kernel.org/all/20260902222759.736124-1-jm@ti.com/
Link to rfc:
https://lore.kernel.org/all/20260812154442.3379851-1-jm@ti.com/

[0] https://lore.kernel.org/all/aqEuyLac2OGkSYX7@squawk/

Judith Mendez (3):
  dt-bindings: nvmem: uniphier-efuse: Add ti,am62p-efuse compatible
  nvmem: uniphier-efuse: Enable for K3 SoCs
  nvmem: uniphier-efuse: Add ti,am62p-efuse compatible

 .../devicetree/bindings/nvmem/socionext,uniphier-efuse.yaml | 6 +++++-
 drivers/nvmem/Kconfig                                       | 3 ++-
 drivers/nvmem/uniphier-efuse.c                              | 1 +
 3 files changed, 8 insertions(+), 2 deletions(-)

-- 
2.34.1

Add ARCH_K3 dependency and set to always build for K3 architecture.
The uniphier-efuse driver must be builtin to support early probe of
k3-socinfo during boot. The k3-socinfo driver requires the efuse
provider for reading silicon revision information on AM62p device.

Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
---
Changes since v2:
- Add Kunihiko's review tag
---
 drivers/nvmem/Kconfig | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index c36c2a4c2a0b7..df65e7ecfa212 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig

@@ -541,8 +541,9 @@ config NVMEM_U_BOOT_ENV
 
 config NVMEM_UNIPHIER_EFUSE
 	tristate "UniPhier SoCs eFuse support"
-	depends on ARCH_UNIPHIER || COMPILE_TEST
+	depends on ARCH_UNIPHIER || ARCH_K3 || COMPILE_TEST
 	depends on HAS_IOMEM
+	default y if ARCH_K3
 	help
 	  This is a simple driver to dump specified values of UniPhier SoC
 	  from eFuse.

-- 
2.34.1

Add ti,am62p-efuse as a compatible string to the uniphier-efuse binding.
The uniphier-efuse driver can be used to read AM62P efuse registers as
well for GP_SW silicon revision detection.

Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
---
Changes since v2:
- Add fallback compatible for ti,am62p-efuse
- Add Kunihiko's review tag
---
 .../devicetree/bindings/nvmem/socionext,uniphier-efuse.yaml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/nvmem/socionext,uniphier-efuse.yaml b/Documentation/devicetree/bindings/nvmem/socionext,uniphier-efuse.yaml
index e27cbae2d63a0..d26b3d2a3eba0 100644
--- a/Documentation/devicetree/bindings/nvmem/socionext,uniphier-efuse.yaml
+++ b/Documentation/devicetree/bindings/nvmem/socionext,uniphier-efuse.yaml

@@ -16,7 +16,11 @@ allOf:
 
 properties:
   compatible:
-    const: socionext,uniphier-efuse
+    oneOf:
+      - const: socionext,uniphier-efuse
+      - items:
+          - const: ti,am62p-efuse
+          - const: socionext,uniphier-efuse
 
   reg:
     maxItems: 1

-- 
2.34.1

Add ti,am62p-efuse compatible to uniphier-efuse. Leverage the
nvmem provider to supply silicon revision information from GP_SW
efuse registers on AM62p device.

Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
---
Changes since v2:
- Add Kunihiko's review tag
---
 drivers/nvmem/uniphier-efuse.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvmem/uniphier-efuse.c b/drivers/nvmem/uniphier-efuse.c
index 85f9372fb97ca..d0953b99d7e18 100644
--- a/drivers/nvmem/uniphier-efuse.c
+++ b/drivers/nvmem/uniphier-efuse.c

@@ -59,6 +59,7 @@ static int uniphier_efuse_probe(struct platform_device *pdev)
 
 static const struct of_device_id uniphier_efuse_of_match[] = {
 	{ .compatible = "socionext,uniphier-efuse",},
+	{ .compatible = "ti,am62p-efuse",},
 	{/* sentinel */},
 };
 MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);

-- 
2.34.1

On Thu, Sep 10, 2026 at 10:55:09AM -0500, Judith Mendez wrote:

Why do you need this change?

Best regards,
Krzysztof

On Thu, Sep 10, 2026 at 10:55:07AM -0500, Judith Mendez wrote:

Add ti,am62p-efuse as a compatible string to the uniphier-efuse binding.
The uniphier-efuse driver can be used to read AM62P efuse registers as
well for GP_SW silicon revision detection.

Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>

Acked-by: Krzysztof Kozlowski <redacted>

Best regards,
Krzysztof