On Fri, Dec 02, 2016 at 02:19:00PM -0800, Brian Norris wrote: > On some boards, we need to enable a regulator before using the HID, and > it's also nice to save power in suspend by disabling it. Support an > optional "vdd-supply" and a companion initialization delay. > > Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx> > Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx> > Cc: Jiri Kosina <jikos@xxxxxxxxxx> > Cc: linux-input@xxxxxxxxxxxxxxx > --- > v2: > * support compatible property for wacom, with specific "vdd-supply" > * name > * support the 100ms delay needed for this digitizer > * target regulator support only at specific device > > v3: > * drop Wacom specifics and allow this to be used generically > * add "init-delay-ms" property support > > v4: > * use devm_regulator_get() (with a 'dummy' regulator for most cases) > instead of _optional() version, to make code less conditional (Dmitry) > * fix but where 'init_delay_ms' wasn't getting assigned properly > * disable regulator in probe() failure path > --- > drivers/hid/i2c-hid/i2c-hid.c | 44 +++++++++++++++++++++++++++++++++++++++++-- > include/linux/i2c/i2c-hid.h | 6 ++++++ > 2 files changed, 48 insertions(+), 2 deletions(-) > > diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c > index b3ec4f2de875..5c6e037613d7 100644 > --- a/drivers/hid/i2c-hid/i2c-hid.c > +++ b/drivers/hid/i2c-hid/i2c-hid.c > @@ -38,6 +38,7 @@ > #include <linux/acpi.h> > #include <linux/of.h> > #include <linux/gpio/consumer.h> > +#include <linux/regulator/consumer.h> > > #include <linux/i2c/i2c-hid.h> > > @@ -937,6 +938,10 @@ static int i2c_hid_of_probe(struct i2c_client *client, > } > pdata->hid_descriptor_address = val; > > + ret = of_property_read_u32(dev->of_node, "init-delay-ms", &val); > + if (!ret) > + pdata->init_delay_ms = val; > + > return 0; > } > > @@ -983,6 +988,15 @@ static int i2c_hid_probe(struct i2c_client *client, > ihid->pdata = *platform_data; > } > > + ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd"); Oh, haveni't noticed that the rest of the driver does not use devm. Well, I'll leave it up to hid-i2c folks to decide if they are OK with mixing up the managed and non-managed resources, it seems safe to me in this case. Reviewed-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Thanks. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
