linux-kernel - [v2 1/2] HID: i2c-hid: elan: Add ili9882t timing

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Message-Id: <20230520050649.2494497-2-yangcong5@huaqin.corp-partner.google.com>
Date:   Sat, 20 May 2023 13:06:48 +0800
From:   Cong Yang <yangcong5@...qin.corp-partner.google.com>
To:     dianders@...omium.org
Cc:     benjamin.tissoires@...hat.com, devicetree@...r.kernel.org,
        dmitry.torokhov@...il.com, hsinyi@...gle.com, jikos@...nel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        mka@...omium.org, yangcong5@...qin.corp-partner.google.com
Subject: [v2 1/2] HID: i2c-hid: elan: Add ili9882t timing

The ili9882t is a TDDI IC ((Touch with Display Driver)). It requires the
panel reset gpio to be high before i2c commands. Use a longer delay in
post_power_delay_ms to ensure the poweron sequence.

Signed-off-by: Cong Yang <yangcong5@...qin.corp-partner.google.com>
---
 drivers/hid/i2c-hid/i2c-hid-of-elan.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hid/i2c-hid/i2c-hid-of-elan.c b/drivers/hid/i2c-hid/i2c-hid-of-elan.c
index 76ddc8be1cbb..dd2435270e73 100644
--- a/drivers/hid/i2c-hid/i2c-hid-of-elan.c
+++ b/drivers/hid/i2c-hid/i2c-hid-of-elan.c
@@ -105,8 +105,15 @@ static const struct elan_i2c_hid_chip_data elan_ekth6915_chip_data = {
 	.hid_descriptor_address = 0x0001,
 };
 
+static const struct elan_i2c_hid_chip_data ilitek_ili9882t_chip_data = {
+	.post_power_delay_ms = 200,
+	.post_gpio_reset_delay_ms = 180,
+	.hid_descriptor_address = 0x0001,
+};
+
 static const struct of_device_id elan_i2c_hid_of_match[] = {
 	{ .compatible = "elan,ekth6915", .data = &elan_ekth6915_chip_data },
+	{ .compatible = "ilitek,ili9882t", .data = &ilitek_ili9882t_chip_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, elan_i2c_hid_of_match);
-- 
2.25.1