@@ -197,6 +197,7 @@ CONFIG_SMEM=y
CONFIG_SANDBOX_SMEM=y
CONFIG_SOUND=y
CONFIG_SOUND_DA7219=y
+CONFIG_SOUND_MAX98357A=y
CONFIG_SOUND_SANDBOX=y
CONFIG_SANDBOX_SPI=y
CONFIG_SPMI=y
new file mode 100644
@@ -0,0 +1,22 @@
+Maxim MAX98357A audio DAC
+
+This node models the Maxim MAX98357A DAC.
+
+Required properties:
+- compatible : "maxim,max98357a"
+
+Optional properties:
+- sdmode-gpios : GPIO specifier for the chip's SD_MODE pin.
+ If this option is not specified then driver does not manage
+ the pin state (e.g. chip is always on).
+- sdmode-delay : specify delay time for SD_MODE pin.
+ If this option is specified, which means it's required i2s clocks
+ ready before SD_MODE is unmuted in order to avoid the speaker pop noise.
+ It's observed that 5ms is sufficient.
+
+Example:
+
+max98357a {
+ compatible = "maxim,max98357a";
+ sdmode-gpios = <&qcom_pinmux 25 0>;
+};
@@ -113,6 +113,15 @@ config SOUND_MAX98095
audio data and I2C for codec control. At present it only works
with the Samsung I2S driver.
+config SOUND_MAX98357A
+ bool "Support Maxim max98357a audio codec"
+ depends on PCI
+ help
+ Enable the max98357a audio codec. This is connected on PCI for
+ audio data codec control. This is currently only capable of providing
+ ACPI information. A full driver (with sound in U-Boot) is currently
+ not available.
+
config SOUND_RT5677
bool "Support Realtek RT5677 audio codec"
depends on SOUND
@@ -17,6 +17,7 @@ obj-$(CONFIG_SOUND_WM8994) += wm8994.o
obj-$(CONFIG_SOUND_MAX98088) += max98088.o maxim_codec.o
obj-$(CONFIG_SOUND_MAX98090) += max98090.o maxim_codec.o
obj-$(CONFIG_SOUND_MAX98095) += max98095.o maxim_codec.o
+obj-$(CONFIG_SOUND_MAX98357A) += max98357a.o
obj-$(CONFIG_SOUND_INTEL_HDA) += hda_codec.o
obj-$(CONFIG_SOUND_I8254) += i8254_beep.o
obj-$(CONFIG_SOUND_RT5677) += rt5677.o
new file mode 100644
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * max98357a.c -- MAX98357A Audio driver
+ *
+ * Copyright 2019 Google LLC
+ * Parts taken from coreboot
+ */
+
+#include <common.h>
+#include <acpigen.h>
+#include <acpi_device.h>
+#include <audio_codec.h>
+#include <dm.h>
+#include <sound.h>
+#include <asm-generic/gpio.h>
+#include <dm/acpi.h>
+
+struct max97357a_priv {
+ struct gpio_desc sdmode_gpio;
+};
+
+static int max97357a_ofdata_to_platdata(struct udevice *dev)
+{
+ struct max97357a_priv *priv = dev_get_priv(dev);
+
+ gpio_request_by_name(dev, "sdmode-gpios", 0, &priv->sdmode_gpio,
+ GPIOD_IS_IN);
+
+ return 0;
+}
+
+static int max97357a_acpi_fill_ssdt(const struct udevice *dev,
+ struct acpi_ctx *ctx)
+{
+ struct max97357a_priv *priv = dev_get_priv(dev);
+ char scope[ACPI_PATH_MAX];
+ char name[ACPI_NAME_MAX];
+ char path[ACPI_PATH_MAX];
+ struct acpi_dp *dp;
+ int ret;
+
+ ret = acpi_device_scope(dev, scope, sizeof(scope));
+ if (ret)
+ return log_msg_ret("scope", ret);
+ ret = acpi_device_name(dev, name);
+ if (ret)
+ return log_msg_ret("name", ret);
+
+ /* Device */
+ acpigen_write_scope(ctx, scope);
+ acpigen_write_device(ctx, name);
+ acpigen_write_name_string(ctx, "_HID",
+ dev_read_string(dev, "acpi,hid"));
+ acpigen_write_name_integer(ctx, "_UID", 0);
+ acpigen_write_name_string(ctx, "_DDN",
+ dev_read_string(dev, "acpi,desc"));
+ acpigen_write_sta(ctx, acpi_device_status(dev));
+
+ ret = acpi_device_write_gpio_desc(ctx, &priv->sdmode_gpio);
+ if (ret)
+ return log_msg_ret("gpio", ret);
+
+ /* Resources */
+ acpigen_write_name(ctx, "_CRS");
+ acpigen_write_resourcetemplate_header(ctx);
+ ret = acpi_device_write_gpio_desc(ctx, &priv->sdmode_gpio);
+ if (ret)
+ return log_msg_ret("gpio", ret);
+ acpigen_write_resourcetemplate_footer(ctx);
+
+ /* _DSD for devicetree properties */
+ /* This points to the first pin in the first gpio entry in _CRS */
+ ret = acpi_device_path(dev, path, sizeof(path));
+ if (ret)
+ return log_msg_ret("path", ret);
+ dp = acpi_dp_new_table("_DSD");
+ acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0,
+ priv->sdmode_gpio.flags & GPIOD_ACTIVE_LOW ?
+ ACPI_GPIO_ACTIVE_LOW : ACPI_GPIO_ACTIVE_HIGH);
+ acpi_dp_add_integer(dp, "sdmode-delay",
+ dev_read_u32_default(dev, "sdmode-delay", 0));
+ acpi_dp_write(ctx, dp);
+
+ acpigen_pop_len(ctx); /* Device */
+ acpigen_pop_len(ctx); /* Scope */
+
+ return 0;
+}
+
+struct acpi_ops max97357a_acpi_ops = {
+ .fill_ssdt = max97357a_acpi_fill_ssdt,
+};
+
+static const struct audio_codec_ops max98357a_ops = {
+};
+
+static const struct udevice_id max98357a_ids[] = {
+ { .compatible = "maxim,max98357a" },
+ { }
+};
+
+U_BOOT_DRIVER(max98357a) = {
+ .name = "max98357a",
+ .id = UCLASS_AUDIO_CODEC,
+ .of_match = max98357a_ids,
+ .ofdata_to_platdata = max97357a_ofdata_to_platdata,
+ .ops = &max98357a_ops,
+ acpi_ops_ptr(&max97357a_acpi_ops)
+};
This chip is used on coral and we need to generate ACPI tables for sound to make it work. Add a driver that does just this (i.e. at present does not actually support playing sound). Signed-off-by: Simon Glass <sjg at chromium.org> --- configs/sandbox_defconfig | 1 + doc/device-tree-bindings/sound/max98357a.txt | 22 ++++ drivers/sound/Kconfig | 9 ++ drivers/sound/Makefile | 1 + drivers/sound/max98357a.c | 109 +++++++++++++++++++ 5 files changed, 142 insertions(+) create mode 100644 doc/device-tree-bindings/sound/max98357a.txt create mode 100644 drivers/sound/max98357a.c