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From:   Prashant Malani <pmalani@chromium.org>
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        DEVICE TREE BINDINGS),
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        Xin Ji <xji@analogixsemi.com>
Subject: [PATCH v5 7/9] drm/bridge: it6505: Register number of Type C switches
Date:   Wed, 22 Jun 2022 17:34:36 +0000
Message-Id: <20220622173605.1168416-8-pmalani@chromium.org>
In-Reply-To: <20220622173605.1168416-1-pmalani@chromium.org>
References: <20220622173605.1168416-1-pmalani@chromium.org>
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From: Pin-Yen Lin <treapking@chromium.org>

Parse the "switches" node, if available, and count and store the number
of Type-C switches within it. The extcon registration is still
supported, but we don't expect both extcon and typec-switch be
registered at the same time.

This patch sets a foundation for the actual registering of Type-C
switches with the Type-C connector class framework.

Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
---

v5 is the first version for this patch.

 drivers/gpu/drm/bridge/ite-it6505.c | 34 +++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
index 4b673c4792d7..b259f9f367f6 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -452,6 +452,7 @@ struct it6505 {
 	struct delayed_work delayed_audio;
 	struct it6505_audio_data audio;
 	struct dentry *debugfs;
+	int num_typec_switches;
 
 	/* it6505 driver hold option */
 	bool enable_drv_hold;
@@ -3229,13 +3230,28 @@ static void it6505_shutdown(struct i2c_client *client)
 		it6505_lane_off(it6505);
 }
 
+static int it6505_register_typec_switches(struct device *device, struct it6505 *it6505)
+{
+	struct device_node *of;
+
+	of = of_get_child_by_name(device->of_node, "switches");
+	if (!of)
+		return -ENODEV;
+
+	it6505->num_typec_switches = of_get_child_count(of);
+	if (it6505->num_typec_switches <= 0)
+		return -ENODEV;
+
+	return 0;
+}
+
 static int it6505_i2c_probe(struct i2c_client *client,
 			    const struct i2c_device_id *id)
 {
 	struct it6505 *it6505;
 	struct device *dev = &client->dev;
 	struct extcon_dev *extcon;
-	int err, intp_irq;
+	int err, intp_irq, ret;
 
 	it6505 = devm_kzalloc(&client->dev, sizeof(*it6505), GFP_KERNEL);
 	if (!it6505)
@@ -3255,11 +3271,21 @@ static int it6505_i2c_probe(struct i2c_client *client,
 	if (PTR_ERR(extcon) == -EPROBE_DEFER)
 		return -EPROBE_DEFER;
 	if (IS_ERR(extcon)) {
-		dev_err(dev, "can not get extcon device!");
-		return PTR_ERR(extcon);
+		if (PTR_ERR(extcon) != -ENODEV)
+			dev_warn(dev, "Cannot get extcon device: %ld", PTR_ERR(extcon));
+		it6505->extcon = NULL;
+	} else {
+		it6505->extcon = extcon;
 	}
 
-	it6505->extcon = extcon;
+	ret = it6505_register_typec_switches(dev, it6505);
+	if (ret) {
+		dev_dbg(dev, "Didn't register Type C switches, err: %d", ret);
+		if (!it6505->extcon) {
+			dev_err(dev, "Both extcon and typec-switch are not registered.");
+			return -EINVAL;
+		}
+	}
 
 	it6505->regmap = devm_regmap_init_i2c(client, &it6505_regmap_config);
 	if (IS_ERR(it6505->regmap)) {
-- 
2.37.0.rc0.104.g0611611a94-goog