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mux: mmio: Add suspend and resume support

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The status of each mux is read during suspend and stored in the private
memory of the mux_chip.
Then the state is restored during the resume.

Reviewed-by: Andrew Davis <afd@ti.com>
Signed-off-by: Thomas Richard (TI.com) <thomas.richard@bootlin.com>
Link: https://patch.msgid.link/20251013-mux-mmio-resume-support-v5-1-de9467ceb2b2@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Richard (TI.com)
2025-10-13 15:04:44 +02:00
committed by Greg Kroah-Hartman
parent f0fdaa4ad5
commit 4863cb2b0f
1 changed files with 73 additions and 9 deletions
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82
drivers/mux/mmio.c
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@@ -15,11 +15,25 @@
#include <linux/property.h>
#include <linux/regmap.h>
struct mux_mmio {
struct regmap_field **fields;
unsigned int *hardware_states;
};
static int mux_mmio_get(struct mux_control *mux, int *state)
{
struct mux_mmio *mux_mmio = mux_chip_priv(mux->chip);
unsigned int index = mux_control_get_index(mux);
return regmap_field_read(mux_mmio->fields[index], state);
}
static int mux_mmio_set(struct mux_control *mux, int state)
{
struct regmap_field **fields = mux_chip_priv(mux->chip);
struct mux_mmio *mux_mmio = mux_chip_priv(mux->chip);
unsigned int index = mux_control_get_index(mux);
return regmap_field_write(fields[mux_control_get_index(mux)], state);
return regmap_field_write(mux_mmio->fields[index], state);
}
static const struct mux_control_ops mux_mmio_ops = {
@@ -43,8 +57,8 @@ static int mux_mmio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct regmap_field **fields;
struct mux_chip *mux_chip;
struct mux_mmio *mux_mmio;
struct regmap *regmap;
void __iomem *base;
int num_fields;
@@ -80,12 +94,20 @@ static int mux_mmio_probe(struct platform_device *pdev)
}
num_fields = ret / 2;
mux_chip = devm_mux_chip_alloc(dev, num_fields, num_fields *
sizeof(*fields));
mux_chip = devm_mux_chip_alloc(dev, num_fields, sizeof(struct mux_mmio));
if (IS_ERR(mux_chip))
return PTR_ERR(mux_chip);
fields = mux_chip_priv(mux_chip);
mux_mmio = mux_chip_priv(mux_chip);
mux_mmio->fields = devm_kmalloc(dev, num_fields * sizeof(*mux_mmio->fields), GFP_KERNEL);
if (IS_ERR(mux_mmio->fields))
return PTR_ERR(mux_mmio->fields);
mux_mmio->hardware_states = devm_kmalloc(dev, num_fields *
sizeof(*mux_mmio->hardware_states), GFP_KERNEL);
if (IS_ERR(mux_mmio->hardware_states))
return PTR_ERR(mux_mmio->hardware_states);
for (i = 0; i < num_fields; i++) {
struct mux_control *mux = &mux_chip->mux[i];
@@ -115,9 +137,9 @@ static int mux_mmio_probe(struct platform_device *pdev)
return -EINVAL;
}
fields[i] = devm_regmap_field_alloc(dev, regmap, field);
if (IS_ERR(fields[i])) {
ret = PTR_ERR(fields[i]);
mux_mmio->fields[i] = devm_regmap_field_alloc(dev, regmap, field);
if (IS_ERR(mux_mmio->fields[i])) {
ret = PTR_ERR(mux_mmio->fields[i]);
dev_err(dev, "bitfield %d: failed to allocate: %d\n",
i, ret);
return ret;
@@ -141,13 +163,55 @@ static int mux_mmio_probe(struct platform_device *pdev)
mux_chip->ops = &mux_mmio_ops;
dev_set_drvdata(dev, mux_chip);
return devm_mux_chip_register(dev, mux_chip);
}
static int mux_mmio_suspend_noirq(struct device *dev)
{
struct mux_chip *mux_chip = dev_get_drvdata(dev);
struct mux_mmio *mux_mmio = mux_chip_priv(mux_chip);
unsigned int state;
int ret, i;
for (i = 0; i < mux_chip->controllers; i++) {
ret = mux_mmio_get(&mux_chip->mux[i], &state);
if (ret) {
dev_err(dev, "control %u: error saving mux: %d\n", i, ret);
return ret;
}
mux_mmio->hardware_states[i] = state;
}
return 0;
}
static int mux_mmio_resume_noirq(struct device *dev)
{
struct mux_chip *mux_chip = dev_get_drvdata(dev);
struct mux_mmio *mux_mmio = mux_chip_priv(mux_chip);
int ret, i;
for (i = 0; i < mux_chip->controllers; i++) {
ret = mux_mmio_set(&mux_chip->mux[i], mux_mmio->hardware_states[i]);
if (ret) {
dev_err(dev, "control %u: error restoring mux: %d\n", i, ret);
return ret;
}
}
return 0;
}
static DEFINE_NOIRQ_DEV_PM_OPS(mux_mmio_pm_ops, mux_mmio_suspend_noirq, mux_mmio_resume_noirq);
static struct platform_driver mux_mmio_driver = {
.driver = {
.name = "mmio-mux",
.of_match_table = mux_mmio_dt_ids,
.pm = pm_sleep_ptr(&mux_mmio_pm_ops),
},
.probe = mux_mmio_probe,
};