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mux: mmio: Do not use syscon helper to build regmap

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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 <afd@ti.com>
Tested-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20250123182059.597491-1-afd@ti.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
This commit is contained in:
Andrew Davis 2025-01-23 12:20:59 -06:00 • committed by Krzysztof Kozlowski
parent 7ea3876af9
commit 61de83fd82
1 changed files with 12 additions and 1 deletions
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13
drivers/mux/mmio.c
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@ -33,6 +33,12 @@ static const struct of_device_id mux_mmio_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids);
static const struct regmap_config mux_mmio_regmap_cfg = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
};
static int mux_mmio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -40,6 +46,7 @@ static int mux_mmio_probe(struct platform_device *pdev)
struct regmap_field **fields;
struct mux_chip *mux_chip;
struct regmap *regmap;
void __iomem *base;
int num_fields;
int ret;
int i;
@ -47,7 +54,11 @@ static int mux_mmio_probe(struct platform_device *pdev)
if (of_device_is_compatible(np, "mmio-mux")) {
regmap = syscon_node_to_regmap(np->parent);
} else {
regmap = device_node_to_regmap(np);
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
regmap = ERR_PTR(-ENODEV);
else
regmap = regmap_init_mmio(dev, base, &mux_mmio_regmap_cfg);
/* Fallback to checking the parent node on "real" errors. */
if (IS_ERR(regmap) && regmap != ERR_PTR(-EPROBE_DEFER)) {
regmap = dev_get_regmap(dev->parent, NULL);