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i2c: core: treat EPROBE_DEFER when acquiring SCL/SDA GPIOs 

Even if I2C bus GPIO recovery is optional, devm_gpiod_get() can return
-EPROBE_DEFER, so we should at least treat that. This ends up with
i2c_register_adapter() to be able to return -EPROBE_DEFER.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Codrin Ciubotariu 2020-08-04 12:59:25 +03:00 committed by Wolfram Sang
parent 75820314de
commit 23a698fe65
1 changed files with 14 additions and 12 deletions
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26
drivers/i2c/i2c-core-base.c
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@ -375,15 +375,16 @@ static int i2c_gpio_init_recovery(struct i2c_adapter *adap)
return i2c_gpio_init_generic_recovery(adap); return i2c_gpio_init_generic_recovery(adap);
} }
static void i2c_init_recovery(struct i2c_adapter *adap) static int i2c_init_recovery(struct i2c_adapter *adap)
{ {
struct i2c_bus_recovery_info *bri = adap->bus_recovery_info; struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
char *err_str; char *err_str;
if (!bri) if (!bri)
return; return 0;
i2c_gpio_init_recovery(adap); if (i2c_gpio_init_recovery(adap) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (!bri->recover_bus) { if (!bri->recover_bus) {
err_str = "no recover_bus() found"; err_str = "no recover_bus() found";
@ -399,10 +400,7 @@ static void i2c_init_recovery(struct i2c_adapter *adap)
if (gpiod_get_direction(bri->sda_gpiod) == 0) if (gpiod_get_direction(bri->sda_gpiod) == 0)
bri->set_sda = set_sda_gpio_value; bri->set_sda = set_sda_gpio_value;
} }
return; } else if (bri->recover_bus == i2c_generic_scl_recovery) {
}
if (bri->recover_bus == i2c_generic_scl_recovery) {
/* Generic SCL recovery */ /* Generic SCL recovery */
if (!bri->set_scl || !bri->get_scl) { if (!bri->set_scl || !bri->get_scl) {
err_str = "no {get|set}_scl() found"; err_str = "no {get|set}_scl() found";
@ -414,10 +412,12 @@ static void i2c_init_recovery(struct i2c_adapter *adap)
} }
} }
return; return 0;
err: err:
dev_err(&adap->dev, "Not using recovery: %s\n", err_str); dev_err(&adap->dev, "Not using recovery: %s\n", err_str);
adap->bus_recovery_info = NULL; adap->bus_recovery_info = NULL;
return -EINVAL;
} }
static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client) static int i2c_smbus_host_notify_to_irq(const struct i2c_client *client)
@ -1444,12 +1444,16 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
if (res) if (res)
goto out_reg; goto out_reg;
dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
pm_runtime_no_callbacks(&adap->dev); pm_runtime_no_callbacks(&adap->dev);
pm_suspend_ignore_children(&adap->dev, true); pm_suspend_ignore_children(&adap->dev, true);
pm_runtime_enable(&adap->dev); pm_runtime_enable(&adap->dev);
res = i2c_init_recovery(adap);
if (res == -EPROBE_DEFER)
goto out_reg;
dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
#ifdef CONFIG_I2C_COMPAT #ifdef CONFIG_I2C_COMPAT
res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev, res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev,
adap->dev.parent); adap->dev.parent);
@ -1458,8 +1462,6 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
"Failed to create compatibility class link\n"); "Failed to create compatibility class link\n");
#endif #endif
i2c_init_recovery(adap);
/* create pre-declared device nodes */ /* create pre-declared device nodes */
of_i2c_register_devices(adap); of_i2c_register_devices(adap);
i2c_acpi_register_devices(adap); i2c_acpi_register_devices(adap);