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authorAndrew Davis <afd@ti.com>2025-01-23 12:20:59 -0600
committerKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>2025-05-01 19:47:35 +0200
commit61de83fd8256e185588670d3cf0bccc3e913819c (patch)
tree89e56e758f939e50cb57cb1a9a8c17a3634271c0
parent7ea3876af994e4fd8065af0314bce6619e73667a (diff)
mux: mmio: Do not use syscon helper to build regmap
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>
-rw-r--r--drivers/mux/mmio.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
index c4e59d2ed42b..9993ce38a818 100644
--- a/drivers/mux/mmio.c
+++ b/drivers/mux/mmio.c
@@ -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);