[PATCH 0/2] Input: cyttsp5 - add vddio regulator

[PATCH 0/2] Input: cyttsp5 - add vddio regulator

[Lin, Meng-Bo]

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.

[PATCH 1/2] dt-bindings: input: cyttsp5: document vddio-supply

[Lin, Meng-Bo]

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.

Document 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@protonmail.com>
---
 .../devicetree/bindings/input/touchscreen/cypress,tt21000.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
index 1959ec394768..869a9bdd962f 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
@@ -34,6 +34,9 @@ properties:
   vdd-supply:
     description: Regulator for voltage.
 
+  vddio-supply:
+    description: Optional Regulator for I/O voltage.
+
   reset-gpios:
     maxItems: 1
 
-- 
2.30.2

[PATCH 2/2] Input: cyttsp5 - add vddio regulator

[Lin, Meng-Bo]

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@protonmail.com>
---
 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);
 		return error;
 	}
 
@@ -800,9 +803,11 @@ static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
 	if (error)
 		return error;
 
-	error = regulator_enable(ts->vdd);
-	if (error)
+	error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies);
+	if (error < 0) {
+		dev_err(ts->dev, "Failed to enable regulators, error %d\n", error);
 		return error;
+	}
 
 	ts->input = devm_input_allocate_device(dev);
 	if (!ts->input) {
-- 
2.30.2

Re: [PATCH 2/2] Input: cyttsp5 - add vddio regulator

[Christophe JAILLET]

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@public.gmane.org>
> ---
>   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;

>   		return error;
>   	}
>   
> @@ -800,9 +803,11 @@ static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
>   	if (error)
>   		return error;
>   
> -	error = regulator_enable(ts->vdd);
> -	if (error)
> +	error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies);
> +	if (error < 0) {
> +		dev_err(ts->dev, "Failed to enable regulators, error %d\n", error);

Eventually, the same here in order to be consistent.

CJ

>   		return error;
> +	}
>   
>   	ts->input = devm_input_allocate_device(dev);
>   	if (!ts->input) {

Re: [PATCH 2/2] Input: cyttsp5 - add vddio regulator

[Dmitry Torokhov]

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@public.gmane.org>
> > ---
> >   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

Re: [PATCH 2/2] Input: cyttsp5 - add vddio regulator

[Dmitry Torokhov]

On Thu, Nov 17, 2022 at 07:05:41PM +0000, Lin, Meng-Bo wrote:
> 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.

This needs binding update.

Thanks.

-- 
Dmitry

Re: [PATCH 2/2] Input: cyttsp5 - add vddio regulator

[Lin, Meng-Bo]

Hi Dmitry,

> This needs binding update. 

Please have a look at the binding update in
https://lore.kernel.org/all/20221117190507.87535-2-linmengbo0689@protonmail.com/
if you don't receive it.

Regards,
Lin

Re: [PATCH 1/2] dt-bindings: input: cyttsp5: document vddio-supply

[Krzysztof Kozlowski]

On 17/11/2022 20:05, Lin, Meng-Bo wrote:
> The Samsung touchscreen controllers are often used with external pull-up

Samsung or Cypress?

> 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.
> 
> Document support for a "vddio-supply" that is enabled by the cyttsp5
> driver so that the regulator gets enabled when needed.
> 

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof

Re: [PATCH 1/2] dt-bindings: input: cyttsp5: document vddio-supply

[Alistair]

On Fri, 18 Nov 2022, at 5:05 AM, Lin, Meng-Bo wrote:
> 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.
> 
> Document 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@protonmail.com>

Reviewed-by: Alistair Francis <alistair@alistair23.me>

> ---
> .../devicetree/bindings/input/touchscreen/cypress,tt21000.yaml | 3 +++
> 1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
> index 1959ec394768..869a9bdd962f 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
> +++ b/Documentation/devicetree/bindings/input/touchscreen/cypress,tt21000.yaml
> @@ -34,6 +34,9 @@ properties:
>    vdd-supply:
>      description: Regulator for voltage.
>  
> +  vddio-supply:
> +    description: Optional Regulator for I/O voltage.
> +
>    reset-gpios:
>      maxItems: 1
>  
> -- 
> 2.30.2
> 
> 
> 

Re: [PATCH 2/2] Input: cyttsp5 - add vddio regulator

[Alistair]

On Fri, 18 Nov 2022, at 5:05 AM, Lin, Meng-Bo wrote:
> 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@protonmail.com>

Acked-by: Alistair Francis <alistair@alistair23.me>

> ---
> 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);
> return error;
> }
>  
> @@ -800,9 +803,11 @@ static int cyttsp5_probe(struct device *dev, struct regmap *regmap, int irq,
> if (error)
> return error;
>  
> - error = regulator_enable(ts->vdd);
> - if (error)
> + error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies), ts->supplies);
> + if (error < 0) {
> + dev_err(ts->dev, "Failed to enable regulators, error %d\n", error);
> return error;
> + }
>  
> ts->input = devm_input_allocate_device(dev);
> if (!ts->input) {
> -- 
> 2.30.2
> 
> 
>