linux-kernel - [PATCH v3 5/7] drm/bridge: anx7625: Register number of Type C switches

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Message-Id: <20220614193558.1163205-6-pmalani@chromium.org>
Date:   Tue, 14 Jun 2022 19:34:39 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     bleung@...omium.org, swboyd@...omium.org,
        heikki.krogerus@...ux.intel.com,
        Prashant Malani <pmalani@...omium.org>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>, Andrzej Hajda <andrzej.hajda@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS),
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        José Expósito <jose.exposito89@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Pin-Yen Lin <treapking@...omium.org>,
        Robert Foss <robert.foss@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Xin Ji <xji@...logixsemi.com>
Subject: [PATCH v3 5/7] drm/bridge: anx7625: Register number of Type C switches

Parse the "switches" node, if available, and count and store the number
of Type-C switches within it. Since we currently don't do anything with
this info, no functional changes are expected from this change.

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

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Tested-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Signed-off-by: Prashant Malani <pmalani@...omium.org>
---

Changes since v2:
- Move ret variable to Patch v3 6/7..
- Make error print a dev_dbg, since it is noisy.
- Added Reviewed-by and Tested-by tags.

Changes since v1:
- No changes.

 drivers/gpu/drm/bridge/analogix/anx7625.c | 18 ++++++++++++++++++
 drivers/gpu/drm/bridge/analogix/anx7625.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 53a5da6c49dd..e3d4c2738b8c 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2581,6 +2581,20 @@ static void anx7625_runtime_disable(void *data)
 	pm_runtime_disable(data);
 }
 
+static int anx7625_register_typec_switches(struct device *device, struct anx7625_data *ctx)
+{
+	struct device_node *of = of_get_child_by_name(device->of_node, "switches");
+
+	if (!of)
+		return -ENODEV;
+
+	ctx->num_typec_switches = of_get_child_count(of);
+	if (ctx->num_typec_switches <= 0)
+		return -ENODEV;
+
+	return 0;
+}
+
 static int anx7625_i2c_probe(struct i2c_client *client,
 			     const struct i2c_device_id *id)
 {
@@ -2686,6 +2700,10 @@ static int anx7625_i2c_probe(struct i2c_client *client,
 	if (platform->pdata.intp_irq)
 		queue_work(platform->workqueue, &platform->work);
 
+	ret = anx7625_register_typec_switches(dev, platform);
+	if (ret)
+		dev_dbg(dev, "Didn't register Type C switches, err: %d\n", ret);
+
 	platform->bridge.funcs = &anx7625_bridge_funcs;
 	platform->bridge.of_node = client->dev.of_node;
 	if (!anx7625_of_panel_on_aux_bus(&client->dev))
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index e257a84db962..d5cbca708842 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -473,6 +473,7 @@ struct anx7625_data {
 	struct drm_connector *connector;
 	struct mipi_dsi_device *dsi;
 	struct drm_dp_aux aux;
+	int num_typec_switches;
 };
 
 #endif  /* __ANX7625_H__ */
-- 
2.36.1.476.g0c4daa206d-goog