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

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Message-Id: <20230206184744.6.Ic234b931025d1f920ce9e06fff294643943a65ad@changeid>
Date:   Mon,  6 Feb 2023 18:48:15 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     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>
Cc:     linux-input@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        devicetree@...r.kernel.org, Stephen Kitt <steve@....org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 6/7] HID: i2c-hid: goodix: Add mainboard-vddio-supply

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>
---
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