linux-kernel - [PATCH v2 3/3] drm/panel: simple: add bus-format support for panel-dpi

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Date:   Wed, 18 May 2022 13:55:40 +0200
From:   Max Krummenacher <max.oss.09@...il.com>
To:     max.krummenacher@...adex.com
Cc:     Marek Vasut <marex@...x.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        Maxime Ripard <mripard@...nel.org>,
        Christoph Niedermaier <cniedermaier@...electronics.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] drm/panel: simple: add bus-format support for panel-dpi

From: Max Krummenacher <max.krummenacher@...adex.com>

Evaluate the device tree bus-format property to set bus_format for
a 'panel-dpi' panel. Additionally infer the bpc value from the
given bus-format.

Valid values for bus-format are found in:
<include/dt-bindings/display/dt-media-bus-format.h>

This completes the addition of panel-dpi to completely specify
a panel-simple panel from the device tree.

Signed-off-by: Max Krummenacher <max.krummenacher@...adex.com>

---

Changes in v2:
    None

 drivers/gpu/drm/panel/panel-simple.c | 43 ++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index a34f4198a534..090c60abb014 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -21,6 +21,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include <dt-bindings/display/dt-media-bus-format.h>
 #include <linux/delay.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
@@ -453,6 +454,7 @@ static int panel_dpi_probe(struct device *dev,
 	struct panel_desc *desc;
 	unsigned int bus_flags;
 	struct videomode vm;
+	u32 bus_format;
 	int ret;
 
 	np = dev->of_node;
@@ -477,6 +479,47 @@ static int panel_dpi_probe(struct device *dev,
 	of_property_read_u32(np, "width-mm", &desc->size.width);
 	of_property_read_u32(np, "height-mm", &desc->size.height);
 
+	if (!of_property_read_u32(np, "bus-format", &bus_format)) {
+		/* infer bpc from bus-format */
+		switch (bus_format) {
+		case DT_MEDIA_BUS_FMT_RGB565_1X16:
+			desc->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
+			desc->bpc = 6;
+			break;
+		case DT_MEDIA_BUS_FMT_RGB666_1X18:
+			desc->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
+			desc->bpc = 6;
+			break;
+		case DT_MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+			desc->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
+			desc->bpc = 6;
+			break;
+		case DT_MEDIA_BUS_FMT_BGR888_1X24:
+			desc->bus_format = MEDIA_BUS_FMT_BGR888_1X24;
+			desc->bpc = 8;
+			break;
+		case DT_MEDIA_BUS_FMT_GBR888_1X24:
+			desc->bus_format = MEDIA_BUS_FMT_GBR888_1X24;
+			desc->bpc = 8;
+			break;
+		case DT_MEDIA_BUS_FMT_RBG888_1X24:
+			desc->bus_format = MEDIA_BUS_FMT_RBG888_1X24;
+			desc->bpc = 8;
+			break;
+		case DT_MEDIA_BUS_FMT_RGB888_1X24:
+			desc->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+			desc->bpc = 8;
+			break;
+		case DT_MEDIA_BUS_FMT_RGB888_1X32_PADHI:
+			desc->bus_format = MEDIA_BUS_FMT_RGB888_1X32_PADHI;
+			desc->bpc = 8;
+			break;
+		default:
+			dev_err(dev, "%pOF: unknown bus-format property\n", np);
+			return -EINVAL;
+		}
+	}
+
 	/* Extract bus_flags from display_timing */
 	bus_flags = 0;
 	vm.flags = timing->flags;
-- 
2.20.1