On Thu, Nov 17, 2022 at 10:16:40PM +0100, Christophe JAILLET wrote:
> Le 17/11/2022 à 20:05, Lin, Meng-Bo a écrit :
> > The Samsung touchscreen controllers are often used with external pull-up
> > for the interrupt line and the I2C lines, so we might need to enable
> > a regulator to bring the lines into usable state. Otherwise, this might
> > cause spurious interrupts and reading from I2C will fail.
> >
> > Implement support for a "vddio-supply" that is enabled by the cyttsp5
> > driver so that the regulator gets enabled when needed.
> >
> > Signed-off-by: Lin, Meng-Bo <linmengbo0689-g/b1ySJe57IN+BqQ9rBEUg@xxxxxxxxxxxxxxxx>
> > ---
> > drivers/input/touchscreen/cyttsp5.c | 19 ++++++++++++-------
> > 1 file changed, 12 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/input/touchscreen/cyttsp5.c b/drivers/input/touchscreen/cyttsp5.c
> > index 24ab1df9fc07..d02fdb940edf 100644
> > --- a/drivers/input/touchscreen/cyttsp5.c
> > +++ b/drivers/input/touchscreen/cyttsp5.c
> > @@ -190,7 +190,7 @@ struct cyttsp5 {
> > int num_prv_rec;
> > struct regmap *regmap;
> > struct touchscreen_properties prop;
> > - struct regulator *vdd;
> > + struct regulator_bulk_data supplies[2];
> > };
> > /*
> > @@ -767,7 +767,7 @@ static void cyttsp5_cleanup(void *data)
> > {
> > struct cyttsp5 *ts = data;
> > - regulator_disable(ts->vdd);
> > + regulator_bulk_disable(ARRAY_SIZE(ts->supplies), ts->supplies);
> > }
> > static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
> > @@ -790,9 +790,12 @@ static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
> > init_completion(&ts->cmd_done);
> > /* Power up the device */
> > - ts->vdd = devm_regulator_get(dev, "vdd");
> > - if (IS_ERR(ts->vdd)) {
> > - error = PTR_ERR(ts->vdd);
> > + ts->supplies[0].supply = "vdd";
> > + ts->supplies[1].supply = "vddio";
> > + error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->supplies),
> > + ts->supplies);
> > + if (error < 0) {
> > + dev_err(ts->dev, "Failed to get regulators, error %d\n", error);
>
> Hi,
>
> dev_err_probe()?
> I think that devm_regulator_bulk_get() can return -EPROBE_DEFER;
No, I'd rather we avoid dev_err_probe().
Thanks.
--
Dmitry
