rockchip: Add a sound driver

Add a sound driver for rk3288 supporting chromebook_jerry. This uses the
I2S driver, and existing audio codec and the clock/pinmux support.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/sound/Makefile

@@ -9,7 +9,7 @@ obj-$(CONFIG_SOUND)	+= i2s-uclass.o
 obj-$(CONFIG_SOUND)	+= sound-uclass.o
 obj-$(CONFIG_I2S_SAMSUNG)	+= samsung-i2s.o
 obj-$(CONFIG_SOUND_SANDBOX)	+= sandbox.o
-obj-$(CONFIG_I2S_ROCKCHIP)	+= rockchip_i2s.o
+obj-$(CONFIG_I2S_ROCKCHIP)	+= rockchip_i2s.o rockchip_sound.o
 obj-$(CONFIG_I2S_SAMSUNG)	+= samsung_sound.o
 obj-$(CONFIG_SOUND_WM8994)	+= wm8994.o
 obj-$(CONFIG_SOUND_MAX98090)	+= max98090.o maxim_codec.o

drivers/sound/rockchip_sound.c

@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 Google, LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#define LOG_CATEGORY UCLASS_SOUND
+
+#include <common.h>
+#include <audio_codec.h>
+#include <clk.h>
+#include <dm.h>
+#include <i2s.h>
+#include <misc.h>
+#include <sound.h>
+#include <asm/arch/periph.h>
+#include <dm/pinctrl.h>
+
+static int rockchip_sound_setup(struct udevice *dev)
+{
+	struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct i2s_uc_priv *i2c_priv = dev_get_uclass_priv(uc_priv->i2s);
+	int ret;
+
+	if (uc_priv->setup_done)
+		return -EALREADY;
+	ret = audio_codec_set_params(uc_priv->codec, i2c_priv->id,
+				     i2c_priv->samplingrate,
+				     i2c_priv->samplingrate * i2c_priv->rfs,
+				     i2c_priv->bitspersample,
+				     i2c_priv->channels);
+	if (ret)
+		return ret;
+	uc_priv->setup_done = true;
+
+	return 0;
+}
+
+static int rockchip_sound_play(struct udevice *dev, void *data, uint data_size)
+{
+	struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
+
+	return i2s_tx_data(uc_priv->i2s, data, data_size);
+}
+
+static int rockchip_sound_probe(struct udevice *dev)
+{
+	struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
+	struct ofnode_phandle_args args;
+	struct udevice *pinctrl;
+	struct clk clk;
+	ofnode node;
+	int ret;
+
+	node = ofnode_find_subnode(dev_ofnode(dev), "cpu");
+	if (!ofnode_valid(node)) {
+		log_debug("Failed to find /cpu subnode\n");
+		return -EINVAL;
+	}
+	ret = ofnode_parse_phandle_with_args(node, "sound-dai",
+					     "#sound-dai-cells", 0, 0, &args);
+	if (ret) {
+		log_debug("Cannot find i2s phandle: %d\n", ret);
+		return ret;
+	}
+	ret = uclass_get_device_by_ofnode(UCLASS_I2S, args.node, &uc_priv->i2s);
+	if (ret) {
+		log_debug("Cannot find i2s: %d\n", ret);
+		return ret;
+	}
+
+	node = ofnode_find_subnode(dev_ofnode(dev), "codec");
+	if (!ofnode_valid(node)) {
+		log_debug("Failed to find /codec subnode\n");
+		return -EINVAL;
+	}
+	ret = ofnode_parse_phandle_with_args(node, "sound-dai",
+					     "#sound-dai-cells", 0, 0, &args);
+	if (ret) {
+		log_debug("Cannot find codec phandle: %d\n", ret);
+		return ret;
+	}
+	ret = uclass_get_device_by_ofnode(UCLASS_AUDIO_CODEC, args.node,
+					  &uc_priv->codec);
+	if (ret) {
+		log_debug("Cannot find audio codec: %d\n", ret);
+		return ret;
+	}
+	ret = clk_get_by_index(uc_priv->i2s, 1, &clk);
+	if (ret) {
+		log_debug("Cannot find clock: %d\n", ret);
+		return ret;
+	}
+	ret = clk_set_rate(&clk, 12288000);
+	if (ret < 0) {
+		log_debug("Cannot find clock: %d\n", ret);
+		return ret;
+	}
+	ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
+	if (ret) {
+		debug("%s: Cannot find pinctrl device\n", __func__);
+		return ret;
+	}
+	ret = pinctrl_request(pinctrl, PERIPH_ID_I2S, 0);
+	if (ret) {
+		debug("%s: Cannot select I2C pinctrl\n", __func__);
+		return ret;
+	}
+
+	log_debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name,
+		  uc_priv->codec->name, uc_priv->i2s->name);
+
+	return 0;
+}
+
+static const struct sound_ops rockchip_sound_ops = {
+	.setup	= rockchip_sound_setup,
+	.play	= rockchip_sound_play,
+};
+
+static const struct udevice_id rockchip_sound_ids[] = {
+	{ .compatible = "rockchip,audio-max98090-jerry" },
+	{ }
+};
+
+U_BOOT_DRIVER(rockchip_sound) = {
+	.name		= "rockchip_sound",
+	.id		= UCLASS_SOUND,
+	.of_match	= rockchip_sound_ids,
+	.probe		= rockchip_sound_probe,
+	.ops		= &rockchip_sound_ops,
+};