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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 Reviewed-by: Krzysztof Kozlowski --- Changes since v2: - Move description under items - Simplify description, only say what NVMEM is supposed to be - Drop maxItems since its implied with items listing --- .../devicetree/bindings/hwinfo/ti,k3-socinfo.yaml | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml b/= Documentation/devicetree/bindings/hwinfo/ti,k3-socinfo.yaml index dada28b47ea07..2900224aac743 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 +29,14 @@ properties: reg: maxItems: 1 =20 + nvmem-cells: + items: + - description: Alternate silicon revision register + + nvmem-cell-names: + items: + - const: gpsw1 + required: - compatible - reg --=20 2.52.0 From nobody Tue Feb 10 15:43:40 2026 Received: from SA9PR02CU001.outbound.protection.outlook.com (mail-southcentralusazon11013031.outbound.protection.outlook.com [40.93.196.31]) (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 1475838A286; 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Mon, 9 Feb 2026 11:23:31 -0600 Received: from DFLE201.ent.ti.com (10.64.6.59) by DFLE210.ent.ti.com (10.64.6.68) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 9 Feb 2026 11:23:30 -0600 Received: from lelvem-mr06.itg.ti.com (10.180.75.8) by DFLE201.ent.ti.com (10.64.6.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20 via Frontend Transport; Mon, 9 Feb 2026 11:23:30 -0600 Received: from judy-hp.dhcp.ti.com (judy-hp.dhcp.ti.com [128.247.81.105]) by lelvem-mr06.itg.ti.com (8.18.1/8.18.1) with ESMTP id 619HNUl61959220; Mon, 9 Feb 2026 11:23:30 -0600 From: Judith Mendez To: Judith Mendez , Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Santosh Shilimkar CC: , , , Andrew Davis Subject: [PATCH v3 2/2] soc: ti: k3-socinfo: Add support for AM62P variants via NVMEM Date: Mon, 9 Feb 2026 11:23:30 -0600 Message-ID: <20260209172330.53623-3-jm@ti.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260209172330.53623-1-jm@ti.com> References: <20260209172330.53623-1-jm@ti.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00002326:EE_|SA2PR10MB4778:EE_ X-MS-Office365-Filtering-Correlation-Id: 94389f70-a91d-470c-bbc9-08de67fff44b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|376014|36860700013; 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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 Reviewed-by: Andrew Davis --- Changes since v2: - Switch k3_chipinfo_variant_to_sr() parameter from pdev to dev for consistency --- drivers/soc/ti/k3-socinfo.c | 41 ++++++++++++++++++++++++++++++++++--- 1 file changed, 38 insertions(+), 3 deletions(-) diff --git a/drivers/soc/ti/k3-socinfo.c b/drivers/soc/ti/k3-socinfo.c index 42275cb5ba1c8..3a35fc456e544 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 +26,8 @@ #define CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT (28) #define CTRLMMR_WKUP_JTAGID_VARIANT_MASK GENMASK(31, 28) =20 +#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 +73,23 @@ 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 device *dev) +{ + u32 gpsw_val =3D 0; + int ret; + + ret =3D nvmem_cell_read_u32(dev, "gpsw1", &gpsw_val); + if (ret) + return ret; + + return gpsw_val & GP_SW1_ADR_MASK; +} + static int k3_chipinfo_partno_to_names(unsigned int partno, struct soc_device_attribute *soc_dev_attr) @@ -86,9 +106,11 @@ 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 device *dev, unsigned int partno, + 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 +124,19 @@ 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(dev); + 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(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 +208,7 @@ 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(dev, 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