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From:   Bryan Brattlof <bb@ti.com>
To:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Amit Kucheria <amitk@kernel.org>,
        Zhang Rui <rui.zhang@intel.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Nishanth Menon <nm@ti.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Tero Kristo <kristo@kernel.org>
CC:     Keerthy <j-keerthy@ti.com>, Linux PM <linux-pm@vger.kernel.org>,
        Device Trees <devicetree@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        LKML ARM <linux-arm-kernel@lists.infradead.org>,
        Bryan Brattlof <bb@ti.com>
Subject: [PATCH v3 04/11] thermal: k3_j72xx_bandgap: map fuse_base only for erratum workaround
Date:   Mon, 31 Oct 2022 18:26:55 -0500
Message-ID: <20221031232702.10339-5-bb@ti.com>
In-Reply-To: <20221031232702.10339-1-bb@ti.com>
References: <20221031232702.10339-1-bb@ti.com>
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Some of TI's J721E SoCs require a software trimming procedure for the
temperature monitors to function properly. To determine if a particular
J721E is not affected by this erratum, both bits in the WKUP_SPARE_FUSE0
region must be set. Other SoCs, not affected by this erratum, will not
need this region.

Map the 'fuse_base' region only when the erratum fix is needed.

Signed-off-by: Bryan Brattlof <bb@ti.com>
---
 drivers/thermal/k3_j72xx_bandgap.c | 34 +++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/thermal/k3_j72xx_bandgap.c b/drivers/thermal/k3_j72xx_bandgap.c
index 395a73cb37425..031ea1091909a 100644
--- a/drivers/thermal/k3_j72xx_bandgap.c
+++ b/drivers/thermal/k3_j72xx_bandgap.c
@@ -386,15 +386,32 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
 	if (IS_ERR(bgp->cfg2_base))
 		return PTR_ERR(bgp->cfg2_base);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
-	fuse_base = devm_ioremap_resource(dev, res);
-	if (IS_ERR(fuse_base))
-		return PTR_ERR(fuse_base);
-
 	driver_data = of_device_get_match_data(dev);
 	if (driver_data)
 		workaround_needed = driver_data->has_errata_i2128;
 
+	/*
+	 * Some of TI's J721E SoCs require a software trimming procedure
+	 * for the temperature monitors to function properly. To determine
+	 * if this particular SoC is NOT affected, both bits in the
+	 * WKUP_SPARE_FUSE0[31:30] will be set (0xC0000000) indicating
+	 * when software trimming should NOT be applied.
+	 *
+	 * https://www.ti.com/lit/er/sprz455c/sprz455c.pdf
+	 */
+	if (workaround_needed) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+		fuse_base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(fuse_base))
+			return PTR_ERR(fuse_base);
+
+		if ((readl(fuse_base) & 0xc0000000) == 0xc0000000)
+			workaround_needed = false;
+	}
+
+	dev_dbg(bgp->dev, "Work around %sneeded\n",
+		workaround_needed ? "" : "not ");
+
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
@@ -427,13 +444,6 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
 		goto err_free_ref_table;
 	}
 
-	/* Workaround not needed if bit30/bit31 is set even for J721e */
-	if (workaround_needed && (readl(fuse_base + 0x0) & 0xc0000000) == 0xc0000000)
-		workaround_needed = false;
-
-	dev_dbg(bgp->dev, "Work around %sneeded\n",
-		workaround_needed ? "" : "not ");
-
 	if (!workaround_needed)
 		init_table(5, ref_table, golden_factors);
 	else
-- 
2.38.1