From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Tissoires Subject: Re: [PATCH 2/2] HID: i2c-hid: support regulator power on/off Date: Mon, 5 Dec 2016 10:14:33 +0100 Message-ID: <20161205091433.GM1280@mail.corp.redhat.com> References: <1480717140-14558-1-git-send-email-briannorris@chromium.org> <1480717140-14558-2-git-send-email-briannorris@chromium.org> <20161202230013.GA18268@dtor-ws> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Return-path: Content-Disposition: inline In-Reply-To: <20161202230013.GA18268@dtor-ws> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Dmitry Torokhov Cc: Brian Norris , Jiri Kosina , Caesar Wang , linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Rob Herring , linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Mark Rutland , Doug Anderson List-Id: devicetree@vger.kernel.org On Dec 02 2016 or thereabouts, Dmitry Torokhov wrote: > 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 > > Signed-off-by: Caesar Wang > > Cc: Jiri Kosina > > Cc: linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > > --- > > 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 > > #include > > #include > > +#include > > > > #include > > > > @@ -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. Yeah, it looks good to me as well. However, I think that will be the trigger to request a devm conversion of the i2c-hid driver. Something I'll add to my list of things to consider for v4.11 then :) Acked-by: Benjamin Tissoires Cheers, Benjamin > > Reviewed-by: Dmitry Torokhov > > Thanks. > > -- > Dmitry -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html