Re: [PATCH] soc: ti: k3-socinfo: Do not use syscon helper to build regmap
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From: Nishanth Menon <nm@ti.com>
Date: 2025-01-23 20:07:48
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On 12:17-20250123, Andrew Davis wrote:
The syscon helper device_node_to_regmap() is used to fetch a regmap registered to a device node. It also currently creates this regmap if the node did not already have a regmap associated with it. This should only be used on "syscon" nodes. This driver is not such a device and instead uses device_node_to_regmap() on its own node as a hacky way to create a regmap for itself. This will not work going forward and so we should create our regmap the normal way by defining our regmap_config, fetching our memory resource, then using the normal regmap_init_mmio() function. Signed-off-by: Andrew Davis <redacted> ---
This is part of the fixes TI K3 platforms boot issues reported in https://lore.kernel.org/all/b2413460-ec8b-4c77-99b8-4c32b262439a@ti.com/ (local) on the latest linus master v6.13-5001-gd0d106a2bd21 + linux next-20250123 Total set of patches tested with: https://lore.kernel.org/all/20250119182121.3956546-1-vaishnav.a@ti.com/ (local) https://lore.kernel.org/r/20250123181726.597144-1-afd@ti.com (local) https://lore.kernel.org/r/20250123181913.597304-1-afd@ti.com (local) https://lore.kernel.org/r/20250123182059.597491-1-afd@ti.com (local) https://lore.kernel.org/r/20250123182234.597665-1-afd@ti.com (local) I will try and get this in at the earliest possible window. Thanks for providing a fix. Cc Rob and Lee
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drivers/soc/ti/k3-socinfo.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)diff --git a/drivers/soc/ti/k3-socinfo.c b/drivers/soc/ti/k3-socinfo.c index 4fb0f0a248288..704039eb3c078 100644 --- a/drivers/soc/ti/k3-socinfo.c +++ b/drivers/soc/ti/k3-socinfo.c@@ -105,6 +105,12 @@ k3_chipinfo_variant_to_sr(unsigned int partno, unsigned int variant, return -ENODEV; } +static const struct regmap_config k3_chipinfo_regmap_cfg = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, +}; + static int k3_chipinfo_probe(struct platform_device *pdev) { struct device_node *node = pdev->dev.of_node;@@ -112,13 +118,18 @@ static int k3_chipinfo_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct soc_device *soc_dev; struct regmap *regmap; + void __iomem *base; u32 partno_id; u32 variant; u32 jtag_id; u32 mfg; int ret; - regmap = device_node_to_regmap(node); + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + regmap = regmap_init_mmio(dev, base, &k3_chipinfo_regmap_cfg); if (IS_ERR(regmap)) return PTR_ERR(regmap);-- 2.39.2
-- Regards, Nishanth Menon Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D