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SubjectRe: [PATCH v7 2/4] Input: goodix - Add regulators suppot
Hi Jagan,

On Thu, Mar 21, 2019 at 01:51:02PM +0530, Jagan Teki wrote:
> Goodix CTP controllers require AVDD28, VDDIO regulators for power-on
> sequence.
>
> The delay between these regualtor operations as per Power-on Timing
> from datasheet[1] is 0 (T1 >= 0 usec).
>
> So, enable and disable these regulators in proper order using normal
> regulator functions without any delay in between.
>
> [1] GT5663 Datasheet_English_20151106_Rev.01
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> drivers/input/touchscreen/goodix.c | 58 ++++++++++++++++++++++++++++++
> 1 file changed, 58 insertions(+)
>
> diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
> index f57d82220a88..de5b80a08f41 100644
> --- a/drivers/input/touchscreen/goodix.c
> +++ b/drivers/input/touchscreen/goodix.c
> @@ -27,6 +27,7 @@
> #include <linux/delay.h>
> #include <linux/irq.h>
> #include <linux/interrupt.h>
> +#include <linux/regulator/consumer.h>
> #include <linux/slab.h>
> #include <linux/acpi.h>
> #include <linux/of.h>
> @@ -47,6 +48,8 @@ struct goodix_ts_data {
> struct touchscreen_properties prop;
> unsigned int max_touch_num;
> unsigned int int_trigger_type;
> + struct regulator *avdd28;
> + struct regulator *vddio;
> struct gpio_desc *gpiod_int;
> struct gpio_desc *gpiod_rst;
> u16 id;
> @@ -532,6 +535,24 @@ static int goodix_get_gpio_config(struct goodix_ts_data *ts)
> return -EINVAL;
> dev = &ts->client->dev;
>
> + ts->avdd28 = devm_regulator_get(dev, "AVDD28");
> + if (IS_ERR(ts->avdd28)) {
> + error = PTR_ERR(ts->avdd28);
> + if (error != -EPROBE_DEFER)
> + dev_err(dev,
> + "Failed to get AVDD28 regulator: %d\n", error);
> + return error;
> + }
> +
> + ts->vddio = devm_regulator_get(dev, "VDDIO");
> + if (IS_ERR(ts->vddio)) {
> + error = PTR_ERR(ts->vddio);
> + if (error != -EPROBE_DEFER)
> + dev_err(dev,
> + "Failed to get VDDIO regulator: %d\n", error);
> + return error;
> + }
> +
> /* Get the interrupt GPIO pin number */
> gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN);
> if (IS_ERR(gpiod)) {
> @@ -764,6 +785,17 @@ static void goodix_config_cb(const struct firmware *cfg, void *ctx)
> complete_all(&ts->firmware_loading_complete);
> }
>
> +static void goodix_disable_regulator(void *arg)
> +{
> + struct goodix_ts_data *ts = arg;
> +
> + if (!IS_ERR(ts->vddio))
> + regulator_disable(ts->vddio);

We error out of goodix_get_gpio_config() and abort probe() if
devm_regulator_get() fails, so there is no need to check for errors
here.

> +
> + if (!IS_ERR(ts->avdd28))
> + regulator_disable(ts->avdd28);
> +}
> +
> static int goodix_ts_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -789,6 +821,32 @@ static int goodix_ts_probe(struct i2c_client *client,
> if (error)
> return error;
>
> + error = devm_add_action_or_reset(&client->dev,
> + goodix_disable_regulator, ts);
> + if (error)
> + return error;

We need to do this after enabling regulators, otherwise there is a risk
of unbalanced disable.

I adjusted and applied, thank you.

--
Dmitry

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