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i2c: muxes: pca954x: Allow sharing reset GPIO

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Some hardware designs with multiple PCA954x devices use a reset GPIO
connected to all the muxes. Support this configuration by making use of
the reset controller framework which can deal with the shared reset
GPIOs. Fall back to the old GPIO descriptor method if the reset
controller framework is not enabled.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Acked-by: Peter Rosin <peda@axentia.se>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Chris Packham 2024-03-13 09:14:00 +13:00 committed by Wolfram Sang
parent 7e5d4236d5
commit b7b73f6d4f
1 changed files with 38 additions and 8 deletions
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46
drivers/i2c/muxes/i2c-mux-pca954x.c
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@ -49,6 +49,7 @@
#include <linux/pm.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <dt-bindings/mux/mux.h>
@ -116,6 +117,9 @@ struct pca954x {
unsigned int irq_mask;
raw_spinlock_t lock;
struct regulator *supply;
struct gpio_desc *reset_gpio;
struct reset_control *reset_cont;
};
/* Provide specs for the MAX735x, PCA954x and PCA984x types we know about */
@ -518,6 +522,35 @@ static int pca954x_init(struct i2c_client *client, struct pca954x *data)
return ret;
}
static int pca954x_get_reset(struct device *dev, struct pca954x *data)
{
data->reset_cont = devm_reset_control_get_optional_shared(dev, NULL);
if (IS_ERR(data->reset_cont))
return dev_err_probe(dev, PTR_ERR(data->reset_cont),
"Failed to get reset\n");
else if (data->reset_cont)
return 0;
/*
* fallback to legacy reset-gpios
*/
data->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(data->reset_gpio)) {
return dev_err_probe(dev, PTR_ERR(data->reset_gpio),
"Failed to get reset gpio");
}
return 0;
}
static void pca954x_reset_deassert(struct pca954x *data)
{
if (data->reset_cont)
reset_control_deassert(data->reset_cont);
else
gpiod_set_value_cansleep(data->reset_gpio, 0);
}
/*
* I2C init/probing/exit functions
*/
@ -526,7 +559,6 @@ static int pca954x_probe(struct i2c_client *client)
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct i2c_adapter *adap = client->adapter;
struct device *dev = &client->dev;
struct gpio_desc *gpio;
struct i2c_mux_core *muxc;
struct pca954x *data;
int num;
@ -554,15 +586,13 @@ static int pca954x_probe(struct i2c_client *client)
return dev_err_probe(dev, ret,
"Failed to enable vdd supply\n");
/* Reset the mux if a reset GPIO is specified. */
gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(gpio)) {
ret = PTR_ERR(gpio);
ret = pca954x_get_reset(dev, data);
if (ret)
goto fail_cleanup;
}
if (gpio) {
if (data->reset_cont || data->reset_gpio) {
udelay(1);
gpiod_set_value_cansleep(gpio, 0);
pca954x_reset_deassert(data);
/* Give the chip some time to recover. */
udelay(1);
}