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@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
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig index cf1037f9a3..cbd9eea77a 100644 --- a/configs/sandbox_defconfig +++ b/configs/sandbox_defconfig @@ -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 diff --git a/doc/device-tree-bindings/sound/max98357a.txt b/doc/device-tree-bindings/sound/max98357a.txt new file mode 100644 index 0000000000..4bce14ce80 --- /dev/null +++ b/doc/device-tree-bindings/sound/max98357a.txt @@ -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>; +}; diff --git a/drivers/sound/Kconfig b/drivers/sound/Kconfig index 7f214b97be..0948d8caab 100644 --- a/drivers/sound/Kconfig +++ b/drivers/sound/Kconfig @@ -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 diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile index 8c3933ad15..9b40c8012f 100644 --- a/drivers/sound/Makefile +++ b/drivers/sound/Makefile @@ -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 diff --git a/drivers/sound/max98357a.c b/drivers/sound/max98357a.c new file mode 100644 index 0000000000..63c336c27b --- /dev/null +++ b/drivers/sound/max98357a.c @@ -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) +};