linux-kernel - Re: [PATCH] usb: typec: mux: fsa4480: add regulator support

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Message-ID: <j2ennvznqeihlfejwjqpxd3q76ifqm6djurvokbw6hrpeph7e3@pw3m4eohamxm>
Date: Tue, 15 Apr 2025 16:32:04 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Michael Grzeschik <mgr@...gutronix.de>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de
Subject: Re: [PATCH] usb: typec: mux: fsa4480: add regulator support

On Thu, Apr 10, 2025 at 11:54:38PM +0200, Michael Grzeschik wrote:
> On Tue, Apr 08, 2025 at 03:18:14PM +0300, Dmitry Baryshkov wrote:
> > On Fri, Apr 04, 2025 at 01:02:20AM +0200, Michael Grzeschik wrote:
> > > The fsa4480 vcc lane could be driven by some external regulator.
> > > This patch is adding support to enable the regulator before probing.
> > > 
> > > Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
> > > ---
> > >  drivers/usb/typec/mux/fsa4480.c | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > > 
> > > diff --git a/drivers/usb/typec/mux/fsa4480.c b/drivers/usb/typec/mux/fsa4480.c
> > > index f71dba8bf07c9..c54e42c7e6a16 100644
> > > --- a/drivers/usb/typec/mux/fsa4480.c
> > > +++ b/drivers/usb/typec/mux/fsa4480.c
> > > @@ -12,6 +12,7 @@
> > >  #include <linux/regmap.h>
> > >  #include <linux/usb/typec_dp.h>
> > >  #include <linux/usb/typec_mux.h>
> > > +#include <linux/regulator/consumer.h>
> > > 
> > >  #define FSA4480_DEVICE_ID	0x00
> > >   #define FSA4480_DEVICE_ID_VENDOR_ID	GENMASK(7, 6)
> > > @@ -273,6 +274,10 @@ static int fsa4480_probe(struct i2c_client *client)
> > >  	if (IS_ERR(fsa->regmap))
> > >  		return dev_err_probe(dev, PTR_ERR(fsa->regmap), "failed to initialize regmap\n");
> > > 
> > > +	ret = devm_regulator_get_enable_optional(dev, "vcc");
> > 
> > Missing DT bindings update that describes this supply.
> 
> Looking into "Documentation/devicetree/bindings/usb/fcs,fsa4480.yaml" it
> seems vcc-supply is alread documented. Is more needed?
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry