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From:   Maxime Ripard <maxime@cerno.tech>
To:     Robert Foss <robert.foss@linaro.org>,
        Andrzej Hajda <a.hajda@samsung.com>,
        Daniel Vetter <daniel.vetter@intel.com>,
        David Airlie <airlied@linux.ie>,
        Sam Ravnborg <sam@ravnborg.org>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Maxime Ripard <maxime@cerno.tech>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Thierry Reding <thierry.reding@gmail.com>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc:     dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH 05/10] drm/panel: Create attach and detach callbacks
Date:   Tue, 20 Jul 2021 15:45:20 +0200
Message-Id: <20210720134525.563936-6-maxime@cerno.tech>
In-Reply-To: <20210720134525.563936-1-maxime@cerno.tech>
References: <20210720134525.563936-1-maxime@cerno.tech>
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In order to make the probe order expectation more consistent between
bridges, let's create attach and detach hooks for the panels as well to
match what is there for bridges.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/drm_panel.c | 20 ++++++++++++++++++++
 include/drm/drm_panel.h     |  6 ++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index f634371c717a..23bca798a2f3 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -223,6 +223,26 @@ int drm_panel_get_modes(struct drm_panel *panel,
 }
 EXPORT_SYMBOL(drm_panel_get_modes);
 
+int drm_panel_attach(struct drm_panel *panel)
+{
+	if (!panel)
+		return -EINVAL;
+
+	if (panel->funcs && panel->funcs->attach)
+		return panel->funcs->attach(panel);
+
+	return -EOPNOTSUPP;
+}
+
+void drm_panel_detach(struct drm_panel *panel)
+{
+	if (!panel)
+		return;
+
+	if (panel->funcs && panel->funcs->detach)
+		panel->funcs->detach(panel);
+}
+
 #ifdef CONFIG_OF
 /**
  * of_drm_find_panel - look up a panel using a device tree node
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 4602f833eb51..b9201d520754 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -68,6 +68,9 @@ enum drm_panel_orientation;
  * does not need to implement the functionality to enable/disable backlight.
  */
 struct drm_panel_funcs {
+	int (*attach)(struct drm_panel *panel);
+	void (*detach)(struct drm_panel *panel);
+
 	/**
 	 * @prepare:
 	 *
@@ -180,6 +183,9 @@ void drm_panel_init(struct drm_panel *panel, struct device *dev,
 void drm_panel_add(struct drm_panel *panel);
 void drm_panel_remove(struct drm_panel *panel);
 
+int drm_panel_attach(struct drm_panel *panel);
+void drm_panel_detach(struct drm_panel *panel);
+
 int drm_panel_prepare(struct drm_panel *panel);
 int drm_panel_unprepare(struct drm_panel *panel);
 
-- 
2.31.1