[PATCH 2/4] ASoc: rockchip: Add rockchip SPDIF transceiver driver

[Heiko Stübner]

Hi,

could you streamline the prefixes a bit perhaps? I.e. so far I've seen

rk_spdif_dev
spdif_runtime_suspend
rockchip_snd_txctrl
rockchip_spdif_hw_params

I guess rockchip_spdif_* or rk_spdif_* for everything might make this a bit 
nicer


Am Dienstag, 28. Juli 2015, 14:03:29 schrieb Sjoerd Simons:
> Add a driver for the SDPIF transceiver available on RK3066, RK3188 and
> RK3288. Heavily based on the rockchip i2s driver.
> 
> Signed-off-by: Sjoerd Simons <sjoerd.simons at collabora.co.uk>
> ---
>  sound/soc/rockchip/Kconfig          |   9 +
>  sound/soc/rockchip/Makefile         |   3 +
>  sound/soc/rockchip/rockchip_spdif.c | 375
> ++++++++++++++++++++++++++++++++++++ sound/soc/rockchip/rockchip_spdif.h | 
> 63 ++++++
>  4 files changed, 450 insertions(+)
>  create mode 100644 sound/soc/rockchip/rockchip_spdif.c
>  create mode 100644 sound/soc/rockchip/rockchip_spdif.h
> 
> diff --git a/sound/soc/rockchip/Kconfig b/sound/soc/rockchip/Kconfig
> index 58bae8e..20bc676 100644
> --- a/sound/soc/rockchip/Kconfig
> +++ b/sound/soc/rockchip/Kconfig
> @@ -15,6 +15,14 @@ config SND_SOC_ROCKCHIP_I2S
>  	  Rockchip I2S device. The device supports upto maximum of
>  	  8 channels each for play and record.
> 
> +config SND_SOC_ROCKCHIP_SPDIF
> +	tristate "Rockchip SPDIF Device Driver"
> +	depends on CLKDEV_LOOKUP && SND_SOC_ROCKCHIP
> +	select SND_SOC_GENERIC_DMAENGINE_PCM
> +	help
> +	  Say Y or M if you want to add support for SPDIF driver for
> +	  Rockchip SPDIF transceiver device.
> +
>  config SND_SOC_ROCKCHIP_MAX98090
>  	tristate "ASoC support for Rockchip boards using a MAX98090 codec"
>  	depends on SND_SOC_ROCKCHIP && I2C && GPIOLIB
> @@ -33,3 +41,4 @@ config SND_SOC_ROCKCHIP_RT5645
>  	help
>  	  Say Y or M here if you want to add support for SoC audio on Rockchip
>  	  boards using the RT5645/RT5650 codec, such as Veyron.
> +

unrelated newline

> diff --git a/sound/soc/rockchip/Makefile b/sound/soc/rockchip/Makefile
> index 1bc1dc3..b02ab69 100644
> --- a/sound/soc/rockchip/Makefile
> +++ b/sound/soc/rockchip/Makefile
> @@ -1,10 +1,13 @@
>  # ROCKCHIP Platform Support
>  snd-soc-i2s-objs := rockchip_i2s.o
> +snd-soc-spdif-objs := rockchip_spdif.o
> 
>  obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-i2s.o
> +obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-spdif.o
> 
>  snd-soc-rockchip-max98090-objs := rockchip_max98090.o
>  snd-soc-rockchip-rt5645-objs := rockchip_rt5645.o
> 
>  obj-$(CONFIG_SND_SOC_ROCKCHIP_MAX98090) += snd-soc-rockchip-max98090.o
>  obj-$(CONFIG_SND_SOC_ROCKCHIP_RT5645) += snd-soc-rockchip-rt5645.o
> +
> diff --git a/sound/soc/rockchip/rockchip_spdif.c
> b/sound/soc/rockchip/rockchip_spdif.c new file mode 100644
> index 0000000..e60ccf6
> --- /dev/null
> +++ b/sound/soc/rockchip/rockchip_spdif.c
> @@ -0,0 +1,375 @@
> +/* sound/soc/rockchip/rockchip_spdif.c
> + *
> + * ALSA SoC Audio Layer - Rockchip I2S Controller driver
								^spdif

> + *
> + * Copyright (c) 2014 Rockchip Electronics Co. Ltd.
> + * Author: Jianqun <jay.xu at rock-chips.com>
> + * Copyright (c) 2015 Collabora Ltd.
> + * Author: Sjoerd Simons <sjoerd.simons at collabora.co.uk>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/of_gpio.h>
> +#include <linux/clk.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +#include <sound/pcm_params.h>
> +#include <sound/dmaengine_pcm.h>
> +
> +#include "rockchip_spdif.h"
> +
> +#define DRV_NAME "rockchip-spdif"
> +
> +struct rk_spdif_dev {
> +	struct device *dev;
> +
> +	struct clk *mclk;
> +	struct clk *hclk;
> +
> +	struct snd_dmaengine_dai_dma_data playback_dma_data;
> +
> +	struct regmap *regmap;
> +};
> +
> +static int spdif_runtime_suspend(struct device *dev)
> +{
> +	struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
> +
> +	clk_disable_unprepare(spdif->mclk);
> +
> +	return 0;
> +}
> +
> +static int spdif_runtime_resume(struct device *dev)
> +{
> +	struct rk_spdif_dev *spdif = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = clk_prepare_enable(spdif->mclk);
> +	if (ret) {
> +		dev_err(spdif->dev, "clock enable failed %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static inline struct rk_spdif_dev *to_info(struct snd_soc_dai *dai)
> +{
> +	return snd_soc_dai_get_drvdata(dai);
> +}
> +
> +static void rockchip_snd_txctrl(struct rk_spdif_dev *spdif, int on)
> +{
> +	if (on) {
> +		regmap_update_bits(spdif->regmap, SPDIF_DMACR,
> +				   SPDIF_DMACR_TDE_ENABLE,
> +				   SPDIF_DMACR_TDE_ENABLE);
> +
> +		regmap_update_bits(spdif->regmap, SPDIF_XFER,
> +				   SPDIF_XFER_TXS_START,
> +				   SPDIF_XFER_TXS_START);

personally I'm always unsure of regmap return values. While the underlying 
method is mmio in this case, regmap_* in theory still has the possibility to 
return errors, so I'm not sure if it's ok to silently ignore them.

Here it would simply mean return the error and also return it in 
rockchip_spdif_trigger below.


Heiko