[v3,093/105] drm/vc4: hdmi: Use reg-names to retrieve the HDMI audio registers
diff mbox series

Message ID e01d4d2216a382ca3842a936972b5cdb13d13066.1590594512.git-series.maxime@cerno.tech
State New
Headers show
Series
  • drm/vc4: Support BCM2711 Display Pipeline
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Commit Message

Maxime Ripard May 27, 2020, 3:49 p.m. UTC
From: Dave Stevenson <dave.stevenson@raspberrypi.com>

The register range used for audio setup in the previous generations of
SoC were always the second range in the device tree. However, now that
the BCM2711 has way more register ranges, it makes sense to retrieve it
by names for it, while preserving the id-based lookup as a fallback.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c |  9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Patch
diff mbox series

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index c069bf8e6d7c..ebe9dd25c65a 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -953,6 +953,7 @@  static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
 	struct snd_soc_card *card = &vc4_hdmi->audio.card;
 	struct device *dev = &vc4_hdmi->pdev->dev;
 	const __be32 *addr;
+	int index;
 	int ret;
 
 	if (!of_find_property(dev->of_node, "dmas", NULL)) {
@@ -973,7 +974,13 @@  static int vc4_hdmi_audio_init(struct vc4_hdmi *vc4_hdmi)
 	 * for DMA transfers.
 	 * This VC/MMU should probably be exposed to avoid this kind of hacks.
 	 */
-	addr = of_get_address(dev->of_node, 1, NULL, NULL);
+	index = of_property_match_string(dev->of_node, "reg-names", "hd");
+	/* Before BCM2711, we don't have a named register range */
+	if (index < 0)
+		index = 1;
+
+	addr = of_get_address(dev->of_node, index, NULL, NULL);
+
 	vc4_hdmi->audio.dma_data.addr = be32_to_cpup(addr) + mai_data->offset;
 	vc4_hdmi->audio.dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	vc4_hdmi->audio.dma_data.maxburst = 2;