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i2c: at91: Move to generic GPIO bus recovery

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Make the Microchip at91 driver the first to use the generic GPIO bus
recovery support from the I2C core and discard the driver implementation.

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 12:59:26 +03:00 committed by Wolfram Sang
parent 23a698fe65
commit 543aa2c4da
2 changed files with 3 additions and 69 deletions
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69
drivers/i2c/busses/i2c-at91-master.c
View File

@ -816,79 +816,16 @@ error:
return ret;
}
static void at91_prepare_twi_recovery(struct i2c_adapter *adap)
{
struct at91_twi_dev *dev = i2c_get_adapdata(adap);
pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_gpio);
}
static void at91_unprepare_twi_recovery(struct i2c_adapter *adap)
{
struct at91_twi_dev *dev = i2c_get_adapdata(adap);
pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_default);
}
static int at91_init_twi_recovery_gpio(struct platform_device *pdev,
struct at91_twi_dev *dev)
{
struct i2c_bus_recovery_info *rinfo = &dev->rinfo;
dev->pinctrl = devm_pinctrl_get(&pdev->dev);
if (!dev->pinctrl || IS_ERR(dev->pinctrl)) {
rinfo->pinctrl = devm_pinctrl_get(&pdev->dev);
if (!rinfo->pinctrl || IS_ERR(rinfo->pinctrl)) {
dev_info(dev->dev, "can't get pinctrl, bus recovery not supported\n");
return PTR_ERR(dev->pinctrl);
return PTR_ERR(rinfo->pinctrl);
}
dev->pinctrl_pins_default = pinctrl_lookup_state(dev->pinctrl,
PINCTRL_STATE_DEFAULT);
dev->pinctrl_pins_gpio = pinctrl_lookup_state(dev->pinctrl,
"gpio");
if (IS_ERR(dev->pinctrl_pins_default) ||
IS_ERR(dev->pinctrl_pins_gpio)) {
dev_info(&pdev->dev, "pinctrl states incomplete for recovery\n");
return -EINVAL;
}
/*
* pins will be taken as GPIO, so we might as well inform pinctrl about
* this and move the state to GPIO
*/
pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_gpio);
rinfo->sda_gpiod = devm_gpiod_get(&pdev->dev, "sda", GPIOD_IN);
if (PTR_ERR(rinfo->sda_gpiod) == -EPROBE_DEFER)
return -EPROBE_DEFER;
rinfo->scl_gpiod = devm_gpiod_get(&pdev->dev, "scl",
GPIOD_OUT_HIGH_OPEN_DRAIN);
if (PTR_ERR(rinfo->scl_gpiod) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (IS_ERR(rinfo->sda_gpiod) ||
IS_ERR(rinfo->scl_gpiod)) {
dev_info(&pdev->dev, "recovery information incomplete\n");
if (!IS_ERR(rinfo->sda_gpiod)) {
gpiod_put(rinfo->sda_gpiod);
rinfo->sda_gpiod = NULL;
}
if (!IS_ERR(rinfo->scl_gpiod)) {
gpiod_put(rinfo->scl_gpiod);
rinfo->scl_gpiod = NULL;
}
pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_default);
return -EINVAL;
}
/* change the state of the pins back to their default state */
pinctrl_select_state(dev->pinctrl, dev->pinctrl_pins_default);
dev_info(&pdev->dev, "using scl, sda for recovery\n");
rinfo->prepare_recovery = at91_prepare_twi_recovery;
rinfo->unprepare_recovery = at91_unprepare_twi_recovery;
rinfo->recover_bus = i2c_generic_scl_recovery;
dev->adapter.bus_recovery_info = rinfo;
return 0;

3
drivers/i2c/busses/i2c-at91.h
View File

@ -157,9 +157,6 @@ struct at91_twi_dev {
struct at91_twi_dma dma;
bool slave_detected;
struct i2c_bus_recovery_info rinfo;
struct pinctrl *pinctrl;
struct pinctrl_state *pinctrl_pins_default;
struct pinctrl_state *pinctrl_pins_gpio;
#ifdef CONFIG_I2C_AT91_SLAVE_EXPERIMENTAL
unsigned smr;
struct i2c_client *slave;