Hi Bibby,
On Thu, Aug 29, 2019 at 10:51 AM Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx> wrote:
>
> On Wed, 2019-08-28 at 12:53 +0200, Bartosz Golaszewski wrote:
> > wt., 27 sie 2019 o 03:20 Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx> napisał(a):
> > >
> > > Although in the most platforms, the power of eeprom and i2c
> > > are alway on, some platforms disable the eeprom and i2c power
> > > in order to meet low power request.
> > > This patch add the pm_runtime ops to control power to support
> > > all platforms.
> > >
> > > Signed-off-by: Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx>
> >
> > Why do you mark it as work-in-progress? Is it supposed to be reviewed?
> >
> Sorry about that I forget to remove it.
> Did you mind review this patch at first? I will remove "WIP" tag in next
> version. Thanks.
Would you be able to resend the patch without the WiP and v0 prefix?
Otherwise some people may end up ignoring it. Thanks.
Best regards,
Tomasz
>
> Bibby
> > Bart
> >
> > > ---
> > > drivers/misc/eeprom/at24.c | 61 +++++++++++++++++++++++++++++++++++++-
> > > 1 file changed, 60 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
> > > index 35bf2477693d..2843e4b4aacd 100644
> > > --- a/drivers/misc/eeprom/at24.c
> > > +++ b/drivers/misc/eeprom/at24.c
> > > @@ -23,6 +23,7 @@
> > > #include <linux/nvmem-provider.h>
> > > #include <linux/regmap.h>
> > > #include <linux/pm_runtime.h>
> > > +#include <linux/regulator/consumer.h>
> > > #include <linux/gpio/consumer.h>
> > >
> > > /* Address pointer is 16 bit. */
> > > @@ -68,6 +69,12 @@
> > > * which won't work on pure SMBus systems.
> > > */
> > >
> > > +static const char * const at24_supply_names[] = {
> > > + "power", "i2c",
> > > +};
> > > +
> > > +#define AT24_NUM_SUPPLIES ARRAY_SIZE(at24_supply_names)
> > > +
> > > struct at24_client {
> > > struct i2c_client *client;
> > > struct regmap *regmap;
> > > @@ -92,6 +99,8 @@ struct at24_data {
> > >
> > > struct gpio_desc *wp_gpio;
> > >
> > > + bool has_supplies;
> > > + struct regulator_bulk_data supplies[AT24_NUM_SUPPLIES];
> > > /*
> > > * Some chips tie up multiple I2C addresses; dummy devices reserve
> > > * them for us, and we'll use them with SMBus calls.
> > > @@ -663,6 +672,17 @@ static int at24_probe(struct i2c_client *client)
> > > at24->client[0].client = client;
> > > at24->client[0].regmap = regmap;
> > >
> > > + for (i = 0; i < AT24_NUM_SUPPLIES; i++)
> > > + at24->supplies[i].supply = at24_supply_names[i];
> > > + err = devm_regulator_bulk_get(&at24->client[0].client->dev,
> > > + AT24_NUM_SUPPLIES,
> > > + at24->supplies);
> > > + if (err == -EPROBE_DEFER) {
> > > + dev_err(dev, "Failed to get power regulators\n");
> > > + return err;
> > > + }
> > > + at24->has_supplies = !err ? true : false;
> > > +
> > > at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);
> > > if (IS_ERR(at24->wp_gpio))
> > > return PTR_ERR(at24->wp_gpio);
> > > @@ -705,13 +725,21 @@ static int at24_probe(struct i2c_client *client)
> > > /* enable runtime pm */
> > > pm_runtime_set_active(dev);
> > > pm_runtime_enable(dev);
> > > + pm_runtime_get_sync(dev);
> > > + if (at24->has_supplies) {
> > > + err = regulator_bulk_enable(AT24_NUM_SUPPLIES, at24->supplies);
> > > + if (err) {
> > > + dev_err(dev, "Failed to enable power regulators\n");
> > > + return err;
> > > + }
> > > + }
> > >
> > > /*
> > > * Perform a one-byte test read to verify that the
> > > * chip is functional.
> > > */
> > > err = at24_read(at24, 0, &test_byte, 1);
> > > - pm_runtime_idle(dev);
> > > + pm_runtime_put(dev);
> > > if (err) {
> > > pm_runtime_disable(dev);
> > > return -ENODEV;
> > > @@ -726,15 +754,46 @@ static int at24_probe(struct i2c_client *client)
> > >
> > > static int at24_remove(struct i2c_client *client)
> > > {
> > > + struct at24_data *at24 = i2c_get_clientdata(client);
> > > +
> > > pm_runtime_disable(&client->dev);
> > > pm_runtime_set_suspended(&client->dev);
> > > + if (at24->has_supplies)
> > > + regulator_bulk_disable(AT24_NUM_SUPPLIES, at24->supplies);
> > >
> > > return 0;
> > > }
> > >
> > > +static int __maybe_unused at24_suspend(struct device *dev)
> > > +{
> > > + struct i2c_client *client = to_i2c_client(dev);
> > > + struct at24_data *at24 = i2c_get_clientdata(client);
> > > +
> > > + if (at24->has_supplies)
> > > + return regulator_bulk_disable(AT24_NUM_SUPPLIES,
> > > + at24->supplies);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int __maybe_unused at24_resume(struct device *dev)
> > > +{
> > > + struct i2c_client *client = to_i2c_client(dev);
> > > + struct at24_data *at24 = i2c_get_clientdata(client);
> > > +
> > > + if (at24->has_supplies)
> > > + return regulator_bulk_enable(AT24_NUM_SUPPLIES,
> > > + at24->supplies);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static SIMPLE_DEV_PM_OPS(at24_pm_ops, at24_suspend, at24_resume);
> > > +
> > > static struct i2c_driver at24_driver = {
> > > .driver = {
> > > .name = "at24",
> > > + .pm = &at24_pm_ops,
> > > .of_match_table = at24_of_match,
> > > .acpi_match_table = ACPI_PTR(at24_acpi_ids),
> > > },
> > > --
> > > 2.18.0
> > >
>
>
