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charset="utf-8" Add optional nvmem-cells and nvmem-cell-names properties to support reading silicon revision information from alternate location using NVMEM providers. This is used on AM62P to read GP_SW1 register for accurate silicon revision detection. Signed-off-by: Judith Mendez --- .../devicetree/bindings/hwinfo/ti,k3-socinfo.yaml | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml b/= Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml index dada28b47ea07..58cc937e13351 100644 --- a/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml +++ b/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml @@ -15,6 +15,9 @@ description: | represented by CTRLMMR_xxx_JTAGID register which contains information ab= out SoC id and revision. =20 + On some SoCs like AM62P, the silicon revision is determined by reading + alternative registers via NVMEM cells. + properties: $nodename: pattern: "^chipid@[0-9a-f]+$" @@ -26,6 +29,15 @@ properties: reg: maxItems: 1 =20 + nvmem-cells: + maxItems: 1 + description: + Reference to NVMEM node containing revision information. + + nvmem-cell-names: + items: + - const: gpsw1 + required: - compatible - reg --=20 2.52.0 From nobody Sat Feb 7 06:14:22 2026 Received: from SN4PR2101CU001.outbound.protection.outlook.com (mail-southcentralusazon11012058.outbound.protection.outlook.com [40.93.195.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 75C24395256; 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charset="utf-8" Add support for detecting AM62P silicon revisions. On AM62P, silicon revision is discovered with GP_SW1 register instead of JTAGID register. Use the NVMEM framework to read GP_SW1 from the gpsw-efuse nvmem provider to determine SoC revision. Signed-off-by: Judith Mendez --- drivers/soc/ti/k3-socinfo.c | 48 ++++++++++++++++++++++++++++++++++--- 1 file changed, 45 insertions(+), 3 deletions(-) diff --git a/drivers/soc/ti/k3-socinfo.c b/drivers/soc/ti/k3-socinfo.c index 42275cb5ba1c8..4b6947a9ceb4d 100644 --- a/drivers/soc/ti/k3-socinfo.c +++ b/drivers/soc/ti/k3-socinfo.c @@ -6,6 +6,7 @@ */ =20 #include +#include #include #include #include @@ -25,6 +26,9 @@ #define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT (28) #define CTRLMMR_WKUP_JTAGID_VARIANT_MASK GENMASK(31, 28) =20 +#define GP_SW1_VALID_BIT BIT(4) +#define GP_SW1_ADR_MASK GENMASK(3, 0) + #define CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT (12) #define CTRLMMR_WKUP_JTAGID_PARTNO_MASK GENMASK(27, 12) =20 @@ -70,6 +74,29 @@ static const char * const am62lx_rev_string_map[] =3D { "1.0", "1.1", }; =20 +static const char * const am62p_gpsw_rev_string_map[] =3D { + "1.0", "1.1", "1.2", +}; + +static int +k3_chipinfo_get_gpsw_variant(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + u32 gpsw_val, adr_val =3D 0; + int ret; + + ret =3D nvmem_cell_read_u32(dev, "gpsw1", &gpsw_val); + if (ret) + return ret; + + if (!(gpsw_val & GP_SW1_VALID_BIT)) + return 0; + + adr_val =3D gpsw_val & GP_SW1_ADR_MASK; + + return adr_val; +} + static int k3_chipinfo_partno_to_names(unsigned int partno, struct soc_device_attribute *soc_dev_attr) @@ -86,9 +113,11 @@ k3_chipinfo_partno_to_names(unsigned int partno, } =20 static int -k3_chipinfo_variant_to_sr(unsigned int partno, unsigned int variant, - struct soc_device_attribute *soc_dev_attr) +k3_chipinfo_variant_to_sr(struct platform_device *pdev, unsigned int partn= o, + unsigned int variant, struct soc_device_attribute *soc_dev_attr) { + int gpsw_variant =3D 0; + switch (partno) { case JTAG_ID_PARTNO_J721E: if (variant >=3D ARRAY_SIZE(j721e_rev_string_map)) @@ -102,6 +131,19 @@ k3_chipinfo_variant_to_sr(unsigned int partno, unsigne= d int variant, soc_dev_attr->revision =3D kasprintf(GFP_KERNEL, "SR%s", am62lx_rev_string_map[variant]); break; + case JTAG_ID_PARTNO_AM62PX: + /* Check GP_SW1 for silicon revision */ + gpsw_variant =3D k3_chipinfo_get_gpsw_variant(pdev); + if (gpsw_variant =3D=3D -EPROBE_DEFER) + return gpsw_variant; + if (gpsw_variant < 0 || gpsw_variant >=3D ARRAY_SIZE(am62p_gpsw_rev_stri= ng_map)) { + dev_warn(&pdev->dev, "Failed to get silicon variant (%d), set SR1.0\n", + gpsw_variant); + gpsw_variant =3D 0; + } + soc_dev_attr->revision =3D kasprintf(GFP_KERNEL, "SR%s", + am62p_gpsw_rev_string_map[gpsw_variant]); + break; default: variant++; soc_dev_attr->revision =3D kasprintf(GFP_KERNEL, "SR%x.0", @@ -173,7 +215,7 @@ static int k3_chipinfo_probe(struct platform_device *pd= ev) goto err; } =20 - ret =3D k3_chipinfo_variant_to_sr(partno_id, variant, soc_dev_attr); + ret =3D k3_chipinfo_variant_to_sr(pdev, partno_id, variant, soc_dev_attr); if (ret) { dev_err(dev, "Unknown SoC SR[0x%08X]: %d\n", jtag_id, ret); goto err; --=20 2.52.0