linux-kernel - [PATCH 05/10] drm/panel: Create attach and detach callbacks

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Message-Id: <20210720134525.563936-6-maxime@cerno.tech>
Date:   Tue, 20 Jul 2021 15:45:20 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Robert Foss <robert.foss@...aro.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] drm/panel: Create attach and detach callbacks

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@...no.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