linux-kernel - Re: [PATCH 6/7] HID: i2c-hid: goodix: Add mainboard-vddio-supply

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Date:   Mon, 6 Feb 2023 20:02:11 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, Stephen Kitt <steve@....org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] HID: i2c-hid: goodix: Add mainboard-vddio-supply

On Mon, Feb 06, 2023 at 06:48:15PM -0800, Douglas Anderson wrote:
> As talked about in the patch ("dt-bindings: HID: i2c-hid: goodix: Add
> mainboard-vddio-supply") we may need to power up a 1.8V rail on the
> host associated with touchscreen IO. Let's add support in the driver
> for it.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

> ---
> Unfortunately, I haven't been able to actually test this on real
> hardware yet. However, the change is very simple, I believe it is
> correct, and it doesn't break other boards I've tested it on.
> 
>  drivers/hid/i2c-hid/i2c-hid-of-goodix.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/hid/i2c-hid/i2c-hid-of-goodix.c b/drivers/hid/i2c-hid/i2c-hid-of-goodix.c
> index 584d833dc0aa..0060e3dcd775 100644
> --- a/drivers/hid/i2c-hid/i2c-hid-of-goodix.c
> +++ b/drivers/hid/i2c-hid/i2c-hid-of-goodix.c
> @@ -26,6 +26,7 @@ struct i2c_hid_of_goodix {
>  	struct i2chid_ops ops;
>  
>  	struct regulator *vdd;
> +	struct regulator *vddio;
>  	struct gpio_desc *reset_gpio;
>  	const struct goodix_i2c_hid_timing_data *timings;
>  };
> @@ -40,6 +41,10 @@ static int goodix_i2c_hid_power_up(struct i2chid_ops *ops)
>  	if (ret)
>  		return ret;
>  
> +	ret = regulator_enable(ihid_goodix->vddio);
> +	if (ret)
> +		return ret;
> +
>  	if (ihid_goodix->timings->post_power_delay_ms)
>  		msleep(ihid_goodix->timings->post_power_delay_ms);
>  
> @@ -56,6 +61,7 @@ static void goodix_i2c_hid_power_down(struct i2chid_ops *ops)
>  		container_of(ops, struct i2c_hid_of_goodix, ops);
>  
>  	gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);
> +	regulator_disable(ihid_goodix->vddio);
>  	regulator_disable(ihid_goodix->vdd);
>  }
>  
> @@ -81,6 +87,10 @@ static int i2c_hid_of_goodix_probe(struct i2c_client *client)
>  	if (IS_ERR(ihid_goodix->vdd))
>  		return PTR_ERR(ihid_goodix->vdd);
>  
> +	ihid_goodix->vddio = devm_regulator_get(&client->dev, "mainboard-vddio");
> +	if (IS_ERR(ihid_goodix->vddio))
> +		return PTR_ERR(ihid_goodix->vddio);
> +
>  	ihid_goodix->timings = device_get_match_data(&client->dev);
>  
>  	return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001, 0);
> -- 
> 2.39.1.519.gcb327c4b5f-goog
> 

-- 
Dmitry