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i2c: gpio: Add support on ACPI-based system

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Add support for the ACPI-based device registration, so that the driver
can be also enabled through ACPI table.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Tested-by: Peibao Liu <liupeibao@loongson.cn>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Binbin Zhou 2023-01-10 21:03:53 +08:00 committed by Wolfram Sang
parent a4a1a78e3b
commit 7b6e9dc7e4
1 changed files with 21 additions and 13 deletions
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34
drivers/i2c/busses/i2c-gpio.c
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@ -13,9 +13,9 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_data/i2c-gpio.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/slab.h>
struct i2c_gpio_private_data {
@ -300,22 +300,23 @@ static inline void i2c_gpio_fault_injector_init(struct platform_device *pdev) {}
static inline void i2c_gpio_fault_injector_exit(struct platform_device *pdev) {}
#endif /* CONFIG_I2C_GPIO_FAULT_INJECTOR*/
static void of_i2c_gpio_get_props(struct device_node *np,
struct i2c_gpio_platform_data *pdata)
/* Get i2c-gpio properties from DT or ACPI table */
static void i2c_gpio_get_properties(struct device *dev,
struct i2c_gpio_platform_data *pdata)
{
u32 reg;
of_property_read_u32(np, "i2c-gpio,delay-us", &pdata->udelay);
device_property_read_u32(dev, "i2c-gpio,delay-us", &pdata->udelay);
if (!of_property_read_u32(np, "i2c-gpio,timeout-ms", &reg))
if (!device_property_read_u32(dev, "i2c-gpio,timeout-ms", &reg))
pdata->timeout = msecs_to_jiffies(reg);
pdata->sda_is_open_drain =
of_property_read_bool(np, "i2c-gpio,sda-open-drain");
device_property_read_bool(dev, "i2c-gpio,sda-open-drain");
pdata->scl_is_open_drain =
of_property_read_bool(np, "i2c-gpio,scl-open-drain");
device_property_read_bool(dev, "i2c-gpio,scl-open-drain");
pdata->scl_is_output_only =
of_property_read_bool(np, "i2c-gpio,scl-output-only");
device_property_read_bool(dev, "i2c-gpio,scl-output-only");
}
static struct gpio_desc *i2c_gpio_get_desc(struct device *dev,
@ -361,7 +362,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
struct i2c_algo_bit_data *bit_data;
struct i2c_adapter *adap;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct fwnode_handle *fwnode = dev_fwnode(dev);
enum gpiod_flags gflags;
int ret;
@ -373,8 +374,8 @@ static int i2c_gpio_probe(struct platform_device *pdev)
bit_data = &priv->bit_data;
pdata = &priv->pdata;
if (np) {
of_i2c_gpio_get_props(np, pdata);
if (fwnode) {
i2c_gpio_get_properties(dev, pdata);
} else {
/*
* If all platform data settings are zero it is OK
@ -435,7 +436,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
bit_data->data = priv;
adap->owner = THIS_MODULE;
if (np)
if (fwnode)
strscpy(adap->name, dev_name(dev), sizeof(adap->name));
else
snprintf(adap->name, sizeof(adap->name), "i2c-gpio%d", pdev->id);
@ -443,7 +444,7 @@ static int i2c_gpio_probe(struct platform_device *pdev)
adap->algo_data = bit_data;
adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
adap->dev.parent = dev;
adap->dev.of_node = np;
device_set_node(&adap->dev, fwnode);
adap->nr = pdev->id;
ret = i2c_bit_add_numbered_bus(adap);
@ -489,10 +490,17 @@ static const struct of_device_id i2c_gpio_dt_ids[] = {
MODULE_DEVICE_TABLE(of, i2c_gpio_dt_ids);
static const struct acpi_device_id i2c_gpio_acpi_match[] = {
{ "LOON0005" }, /* LoongArch */
{ }
};
MODULE_DEVICE_TABLE(acpi, i2c_gpio_acpi_match);
static struct platform_driver i2c_gpio_driver = {
.driver = {
.name = "i2c-gpio",
.of_match_table = i2c_gpio_dt_ids,
.acpi_match_table = i2c_gpio_acpi_match,
},
.probe = i2c_gpio_probe,
.remove = i2c_gpio_remove,