linux-kernel - Re: [PATCH 2/2] Input: cyttsp5

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Message-Id: <b32cf5f3-2be6-4401-86f2-37c880d46a3a@app.fastmail.com>
Date:   Sat, 19 Nov 2022 09:29:00 +1000
From:   Alistair <alistair@...stair23.me>
To:     "Lin, Meng-Bo" <linmengbo0689@...tonmail.com>,
        linux-input@...r.kernel.org
Cc:     "Dmitry Torokhov" <dmitry.torokhov@...il.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] Input: cyttsp5 - add vddio regulator

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@...tonmail.com>

Acked-by: Alistair Francis <alistair@...stair23.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
> 
> 
>