ASoC: mediatek: support memory-region assignment

Merge series from Trevor Wu <trevor.wu@mediatek.com>:

This series of patches adds support for memory-region assignment, so the
access region of DMA engine could be restricted.
Patches are based on broonie tree "for-next" branch.

Trevor Wu (2):
  ASoC: mediatek: mt8195: support reserved memory assignment
  dt-bindings: mediatek: mt8195: add memory-region property

 .../devicetree/bindings/sound/mt8195-afe-pcm.yaml         | 8 ++++++++
 sound/soc/mediatek/mt8195/mt8195-afe-pcm.c                | 7 +++++++
 2 files changed, 15 insertions(+)

--
2.18.0

Documentation/devicetree/bindings/sound/mt8195-afe-pcm.yaml

@@ -19,6 +19,12 @@ properties:
   interrupts:
     maxItems: 1
 
+  memory-region:
+    maxItems: 1
+    description: |
+      Shared memory region for AFE memif.  A "shared-dma-pool".
+      See ../reserved-memory/reserved-memory.txt for details.
+
   mediatek,topckgen:
     $ref: "/schemas/types.yaml#/definitions/phandle"
     description: The phandle of the mediatek topckgen controller
@@ -125,6 +131,7 @@ required:
   - power-domains
   - clocks
   - clock-names
+  - memory-region
 
 additionalProperties: false
 
@@ -139,6 +146,7 @@ examples:
         interrupts = <GIC_SPI 822 IRQ_TYPE_LEVEL_HIGH 0>;
         mediatek,topckgen = <&topckgen>;
         power-domains = <&spm 7>; //MT8195_POWER_DOMAIN_AUDIO
+        memory-region = <&snd_dma_mem_reserved>;
         clocks = <&clk26m>,
                  <&topckgen 163>, //CLK_TOP_APLL1
                  <&topckgen 166>, //CLK_TOP_APLL2

sound/soc/mediatek/mt8195/mt8195-afe-pcm.c

@@ -14,6 +14,7 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/pm_runtime.h>
 #include "mt8195-afe-common.h"
 #include "mt8195-afe-clk.h"
@@ -3061,6 +3062,12 @@ static int mt8195_afe_pcm_dev_probe(struct platform_device *pdev)
 	int i, irq_id, ret;
 	struct snd_soc_component *component;
 
+	ret = of_reserved_mem_device_init(dev);
+	if (ret) {
+		dev_err(dev, "failed to assign memory region: %d\n", ret);
+		return ret;
+	}
+
 	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(33));
 	if (ret)
 		return ret;