[linux-sunxi] Re: [PATCH 3/3] ASoC: sun4i-i2s: Add support for H3

Chen-Yu Tsai wens at csie.org
Wed Jul 5 19:08:44 PDT 2017


On Thu, Jul 6, 2017 at 1:49 AM, Code Kipper <codekipper at gmail.com> wrote:
> On 5 July 2017 at 18:20, Maxime Ripard <maxime.ripard at free-electrons.com> wrote:
>> On Wed, Jul 05, 2017 at 05:43:24PM +0200, codekipper at gmail.com wrote:
>>> From: Marcus Cooper <codekipper at gmail.com>
>>>
>>> There are a lot of changes to the sun8i-h3 i2s block but not enough
>>> to warrant to a new driver.
>>>
>>> Signed-off-by: Marcus Cooper <codekipper at gmail.com>
>>> ---
>>>  .../devicetree/bindings/sound/sun4i-i2s.txt        |   2 +
>>>  sound/soc/sunxi/sun4i-i2s.c                        | 339 ++++++++++++++++++++-
>>>  2 files changed, 337 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
>>> index ee21da865771..fc5da6080759 100644
>>> --- a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
>>> +++ b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
>>> @@ -8,6 +8,7 @@ Required properties:
>>>  - compatible: should be one of the following:
>>>     - "allwinner,sun4i-a10-i2s"
>>>     - "allwinner,sun6i-a31-i2s"
>>> +   - "allwinner,sun8i-h3-i2s"
>>>  - reg: physical base address of the controller and length of memory mapped
>>>    region.
>>>  - interrupts: should contain the I2S interrupt.
>>> @@ -22,6 +23,7 @@ Required properties:
>>>
>>>  Required properties for the following compatibles:
>>>       - "allwinner,sun6i-a31-i2s"
>>> +     - "allwinner,sun8i-h3-i2s"
>>>  - resets: phandle to the reset line for this codec
>>>
>>>  Example:
>>> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
>>> index bb7affd53002..0b853fe320e0 100644
>>> --- a/sound/soc/sunxi/sun4i-i2s.c
>>> +++ b/sound/soc/sunxi/sun4i-i2s.c
>>> @@ -26,9 +26,16 @@
>>>  #include <sound/soc-dai.h>
>>>
>>>  #define SUN4I_I2S_CTRL_REG           0x00
>>> +#define SUN4I_I2S_CTRL_BCLK_OUT                      BIT(18)
>>> +#define SUN4I_I2S_CTRL_LRCK_OUT                      BIT(17)
>>> +#define SUN4I_I2S_CTRL_LRCKR_OUT             BIT(16)
>>>  #define SUN4I_I2S_CTRL_SDO_EN_MASK           GENMASK(11, 8)
>>>  #define SUN4I_I2S_CTRL_SDO_EN(sdo)                   BIT(8 + (sdo))
>>>  #define SUN4I_I2S_CTRL_MODE_MASK             BIT(5)
>>> +#define SUN8I_I2S_CTRL_MODE_MASK             GENMASK(5, 4)
>>> +#define SUN8I_I2S_CTRL_MODE_RIGHT_J                  (2 << 4)
>>> +#define SUN8I_I2S_CTRL_MODE_I2S                      (1 << 4)
>>> +#define SUN8I_I2S_CTRL_MODE_PCM                      (0 << 4)
>>>  #define SUN4I_I2S_CTRL_MODE_SLAVE                    (1 << 5)
>>>  #define SUN4I_I2S_CTRL_MODE_MASTER                   (0 << 5)
>>>  #define SUN4I_I2S_CTRL_TX_EN                 BIT(2)
>>> @@ -36,16 +43,27 @@
>>>  #define SUN4I_I2S_CTRL_GL_EN                 BIT(0)
>>>
>>>  #define SUN4I_I2S_FMT0_REG           0x04
>>> +#define SUN8I_I2S_FMT0_LRCLK_POLARITY_MASK   BIT(19)
>>> +#define SUN8I_I2S_FMT0_LRCLK_POLARITY_INVERTED               (1 << 19)
>>> +#define SUN8I_I2S_FMT0_LRCLK_POLARITY_NORMAL         (0 << 19)
>>> +#define SUN8I_I2S_FMT0_LRCK_PERIOD_MASK              GENMASK(17, 8)
>>> +#define SUN8I_I2S_FMT0_LRCK_PERIOD(period)           ((period) << 8)
>>>  #define SUN4I_I2S_FMT0_LRCLK_POLARITY_MASK   BIT(7)
>>>  #define SUN4I_I2S_FMT0_LRCLK_POLARITY_INVERTED               (1 << 7)
>>>  #define SUN4I_I2S_FMT0_LRCLK_POLARITY_NORMAL         (0 << 7)
>>> +#define SUN8I_I2S_FMT0_BCLK_POLARITY_MASK    BIT(7)
>>> +#define SUN8I_I2S_FMT0_BCLK_POLARITY_INVERTED                (1 << 7)
>>> +#define SUN8I_I2S_FMT0_BCLK_POLARITY_NORMAL          (0 << 7)
>>>  #define SUN4I_I2S_FMT0_BCLK_POLARITY_MASK    BIT(6)
>>>  #define SUN4I_I2S_FMT0_BCLK_POLARITY_INVERTED                (1 << 6)
>>>  #define SUN4I_I2S_FMT0_BCLK_POLARITY_NORMAL          (0 << 6)
>>>  #define SUN4I_I2S_FMT0_SR_MASK                       GENMASK(5, 4)
>>> +#define SUN8I_I2S_FMT0_SR_MASK                       GENMASK(6, 4)
>>>  #define SUN4I_I2S_FMT0_SR(sr)                                ((sr) << 4)
>>>  #define SUN4I_I2S_FMT0_WSS_MASK                      GENMASK(3, 2)
>>>  #define SUN4I_I2S_FMT0_WSS(wss)                              ((wss) << 2)
>>> +#define SUN8I_I2S_FMT0_WSS_MASK                      GENMASK(2, 0)
>>> +#define SUN8I_I2S_FMT0_WSS(wss)                              (wss)
>>>  #define SUN4I_I2S_FMT0_FMT_MASK                      GENMASK(1, 0)
>>>  #define SUN4I_I2S_FMT0_FMT_RIGHT_J                   (2 << 0)
>>>  #define SUN4I_I2S_FMT0_FMT_LEFT_J                    (1 << 0)
>>> @@ -53,6 +71,7 @@
>>>
>>>  #define SUN4I_I2S_FMT1_REG           0x08
>>>  #define SUN4I_I2S_FIFO_TX_REG                0x0c
>>> +#define SUN8I_I2S_INT_STA_REG                0x0c
>>>  #define SUN4I_I2S_FIFO_RX_REG                0x10
>>>
>>>  #define SUN4I_I2S_FIFO_CTRL_REG              0x14
>>> @@ -70,10 +89,13 @@
>>>  #define SUN4I_I2S_DMA_INT_CTRL_RX_DRQ_EN     BIT(3)
>>>
>>>  #define SUN4I_I2S_INT_STA_REG                0x20
>>> +#define SUN8I_I2S_FIFO_TX_REG                0x20
>>>
>>>  #define SUN4I_I2S_CLK_DIV_REG                0x24
>>> +#define SUN8I_I2S_CLK_DIV_MCLK_EN            BIT(8)
>>>  #define SUN4I_I2S_CLK_DIV_MCLK_EN            BIT(7)
>>>  #define SUN4I_I2S_CLK_DIV_BCLK_MASK          GENMASK(6, 4)
>>> +#define SUN8I_I2S_CLK_DIV_BCLK_MASK          GENMASK(7, 4)
>>>  #define SUN4I_I2S_CLK_DIV_BCLK(bclk)                 ((bclk) << 4)
>>>  #define SUN4I_I2S_CLK_DIV_MCLK_MASK          GENMASK(3, 0)
>>>  #define SUN4I_I2S_CLK_DIV_MCLK(mclk)                 ((mclk) << 0)
>>> @@ -82,14 +104,27 @@
>>>  #define SUN4I_I2S_TX_CNT_REG         0x2c
>>>
>>>  #define SUN4I_I2S_TX_CHAN_SEL_REG    0x30
>>> +#define SUN8I_I2S_TX_CHAN_CFG_REG    0x30
>>>  #define SUN4I_I2S_TX_CHAN_SEL(num_chan)              (((num_chan) - 1) << 0)
>>>
>>>  #define SUN4I_I2S_TX_CHAN_MAP_REG    0x34
>>>  #define SUN4I_I2S_TX_CHAN_MAP(chan, sample)  ((sample) << (chan << 2))
>>> +#define SUN8I_I2S_TX_CHAN_SEL_REG    0x34
>>> +#define SUN8I_I2S_TX_CHAN_OFFSET_MASK                GENMASK(13, 12)
>>> +#define SUN8I_I2S_TX_CHAN_OFFSET(offset)     (offset << 12)
>>> +#define SUN8I_I2S_TX_CHAN_EN_MASK            GENMASK(11, 4)
>>> +#define SUN8I_I2S_TX_CHAN_EN(num_chan)               (((1 << num_chan) - 1) << 4)
>>> +#define SUN8I_I2S_TX_CHAN_SEL_MASK           GENMASK(2, 0)
>>> +#define SUN8I_I2S_TX_CHAN_SEL(num_chan)              (((num_chan) - 1) << 0)
>>>
>>>  #define SUN4I_I2S_RX_CHAN_SEL_REG    0x38
>>>  #define SUN4I_I2S_RX_CHAN_MAP_REG    0x3c
>>>
>>> +#define SUN8I_I2S_TX_CHAN_MAP_REG    0x44
>>> +
>>> +#define SUN8I_I2S_RX_CHAN_SEL_REG      0x54
>>> +#define SUN8I_I2S_RX_CHAN_MAP_REG      0x58
>>> +
>>>  struct sun4i_i2s {
>>>       struct clk      *bus_clk;
>>>       struct clk      *mod_clk;
>>> @@ -363,6 +398,225 @@ static int sun4i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
>>>       return 0;
>>>  }
>>>
>>> +static int sun8i_i2s_set_clk_rate(struct sun4i_i2s *i2s,
>>> +                               unsigned int rate,
>>> +                               unsigned int word_size)
>>> +{
>>> +     unsigned int clk_rate;
>>> +     int bclk_div, mclk_div;
>>> +     int ret, i;
>>> +
>>> +     switch (rate) {
>>> +     case 176400:
>>> +     case 88200:
>>> +     case 44100:
>>> +     case 22050:
>>> +     case 11025:
>>> +             clk_rate = 22579200;
>>> +             break;
>>> +
>>> +     case 192000:
>>> +     case 128000:
>>> +     case 96000:
>>> +     case 64000:
>>> +     case 48000:
>>> +     case 32000:
>>> +     case 24000:
>>> +     case 16000:
>>> +     case 12000:
>>> +     case 8000:
>>> +             clk_rate = 24576000;
>>> +             break;
>>> +
>>> +     default:
>>> +             return -EINVAL;
>>> +     }
>>> +
>>> +     ret = clk_set_rate(i2s->mod_clk, clk_rate);
>>> +     if (ret)
>>> +             return ret;
>>> +
>>> +     /* Always favor the highest oversampling rate */
>>> +     for (i = (ARRAY_SIZE(sun4i_i2s_oversample_rates) - 1); i >= 0; i--) {
>>> +             unsigned int oversample_rate = sun4i_i2s_oversample_rates[i];
>>> +
>>> +             bclk_div = sun4i_i2s_get_bclk_div(i2s, oversample_rate,
>>> +                                               word_size);
>>> +             mclk_div = sun4i_i2s_get_mclk_div(i2s, oversample_rate,
>>> +                                               clk_rate,
>>> +                                               rate);
>>> +
>>> +             if ((bclk_div >= 0) && (mclk_div >= 0))
>>> +                     break;
>>> +     }
>>> +
>>> +     if ((bclk_div < 0) || (mclk_div < 0))
>>> +             return -EINVAL;
>>> +
>>> +     regmap_write(i2s->regmap, SUN4I_I2S_CLK_DIV_REG,
>>> +                  SUN4I_I2S_CLK_DIV_BCLK(bclk_div) |
>>> +                  SUN4I_I2S_CLK_DIV_MCLK(mclk_div + 1) |
>>> +                  SUN8I_I2S_CLK_DIV_MCLK_EN);
>>
>> Duplicating all that code just for a single bit difference doesn't
>> seem very wise. You can handle that bit difference through
>> regmap_fields.
>
> Thanks Maxime for the quick review...I'll ack all these and get back
> to you if I get stuck. Just had a quick look at reusing the original
> function of the above and with some additional quirks it seems to
> work. Wasn't aware of the regmap_fields so I will need to investiagte
> their usage, do you know of any good examples?
> BR,
> CK

See https://wens.tw/hdmi-i2c-regmap.txt for an example of what I'm
doing for the HDMI driver. Note that this is a bit extreme as some
regmap_fields are only 1 bit wide. This example uses regmap_fields
for all register bitfields that are different.

In other cases where only the register offset differs I would just
have regmap_field point to the whole register.

ChenYu

>>
>>
>>> +     /* Set sync period */
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
>>> +                  SUN8I_I2S_FMT0_LRCK_PERIOD_MASK,
>>> +                  SUN8I_I2S_FMT0_LRCK_PERIOD((2 * word_size)-1));
>>> +     regmap_write(i2s->regmap, SUN4I_I2S_FMT1_REG, 0);
>>
>> It seems to be applicable for the old flavour too, why isn't it there?
>>
>>> +
>>> +     return 0;
>>> +}
>>> +
>>> +static int sun8i_i2s_hw_params(struct snd_pcm_substream *substream,
>>> +                            struct snd_pcm_hw_params *params,
>>> +                            struct snd_soc_dai *dai)
>>> +{
>>> +     struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
>>> +     int sr, wss;
>>> +     u32 width, channels = 0;
>>> +
>>> +     switch (params_channels(params)) {
>>> +     case 2:
>>> +             channels |= SUN4I_I2S_CTRL_SDO_EN(0);
>>> +             break;
>>> +     default:
>>> +             dev_err(dai->dev, "invalid channel: %d\n",
>>> +                     params_channels(params));
>>> +             return -EINVAL;
>>> +     }
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
>>> +                        SUN4I_I2S_CTRL_SDO_EN_MASK, channels);
>>
>> This seems applicable to the old generation.
>>
>>> +     /* Configure the channels */
>>> +     regmap_write(i2s->regmap, SUN8I_I2S_TX_CHAN_CFG_REG,
>>> +                  SUN4I_I2S_TX_CHAN_SEL(params_channels(params)));
>>
>> This can be handled by regmap_fields.
>>
>>> +     /* Select the channels */
>>> +     regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
>>> +                        SUN8I_I2S_TX_CHAN_EN_MASK |
>>> +                        SUN8I_I2S_TX_CHAN_SEL_MASK,
>>> +                        SUN8I_I2S_TX_CHAN_EN(params_channels(params)) |
>>> +                        SUN8I_I2S_TX_CHAN_SEL(params_channels(params)));
>>
>> Ditto.
>>
>>>
>>> +     /* Map the channels for stereo playback */
>>> +     regmap_write(i2s->regmap, SUN8I_I2S_TX_CHAN_MAP_REG,
>>> +                  SUN4I_I2S_TX_CHAN_MAP(1, 1));
>>
>> Ditto.
>>
>>> +     /* Select the channels */
>>> +     regmap_write(i2s->regmap, SUN8I_I2S_RX_CHAN_SEL_REG,
>>> +                  SUN8I_I2S_TX_CHAN_SEL(params_channels(params)));
>>
>> Ditto.
>>
>>> +     /* Map the channels for stereo capture */
>>> +     regmap_write(i2s->regmap, SUN8I_I2S_RX_CHAN_MAP_REG,
>>> +                  SUN4I_I2S_TX_CHAN_MAP(1, 1));
>>
>> Ditto.
>>
>>> +     switch (params_physical_width(params)) {
>>> +     case 16:
>>> +             width = DMA_SLAVE_BUSWIDTH_2_BYTES;
>>> +             break;
>>> +     case 24:
>>> +     case 32:
>>> +             width = DMA_SLAVE_BUSWIDTH_4_BYTES;
>>> +             break;
>>> +     default:
>>> +             return -EINVAL;
>>> +     }
>>> +     i2s->playback_dma_data.addr_width = width;
>>
>> This is applicable to the old generation.
>>
>>> +
>>> +     switch (params_width(params)) {
>>> +     case 16:
>>> +             sr = 3;
>>> +             wss = 3;
>>> +             break;
>>> +     case 20:
>>> +             sr = 4;
>>> +             wss = 4;
>>> +             break;
>>> +     case 24:
>>> +             sr = 5;
>>> +             wss = 5;
>>> +             break;
>>> +     default:
>>> +             return -EINVAL;
>>> +     }
>>
>> It looks like this changed, maybe we can split it into a separate
>> function?
>>
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
>>> +                        SUN8I_I2S_FMT0_WSS_MASK | SUN8I_I2S_FMT0_SR_MASK,
>>> +                        SUN8I_I2S_FMT0_WSS(wss) | SUN4I_I2S_FMT0_SR(sr));
>>> +
>>> +     return sun8i_i2s_set_clk_rate(i2s, params_rate(params),
>>> +                                   params_width(params));
>>> +}
>>> +
>>> +static int sun8i_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
>>> +{
>>> +     struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
>>> +     u32 val = SUN8I_I2S_CTRL_MODE_I2S;
>>> +     u32 offset = 0;
>>> +
>>> +     /* DAI Mode */
>>> +     switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
>>> +     case SND_SOC_DAIFMT_I2S:
>>> +             offset = 1;
>>> +             break;
>>> +     case SND_SOC_DAIFMT_LEFT_J:
>>> +             break;
>>> +     case SND_SOC_DAIFMT_RIGHT_J:
>>> +             val = SUN8I_I2S_CTRL_MODE_RIGHT_J;
>>> +             break;
>>> +     default:
>>> +             return -EINVAL;
>>> +     }
>>> +
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
>>> +                        SUN8I_I2S_CTRL_MODE_MASK,
>>> +                        val);
>>> +
>>> +     /* blck offset determines whether i2s or LJ */
>>> +     regmap_update_bits(i2s->regmap, SUN8I_I2S_TX_CHAN_SEL_REG,
>>> +                        SUN8I_I2S_TX_CHAN_OFFSET_MASK,
>>> +                        SUN8I_I2S_TX_CHAN_OFFSET(offset));
>>> +
>>> +     /* DAI clock polarity */
>>> +     switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
>>> +     case SND_SOC_DAIFMT_IB_IF:
>>> +             /* Invert both clocks */
>>> +             val = SUN8I_I2S_FMT0_BCLK_POLARITY_INVERTED |
>>> +                     SUN8I_I2S_FMT0_LRCLK_POLARITY_INVERTED;
>>> +             break;
>>> +     case SND_SOC_DAIFMT_IB_NF:
>>> +             /* Invert bit clock */
>>> +             val = SUN8I_I2S_FMT0_BCLK_POLARITY_INVERTED |
>>> +                     SUN8I_I2S_FMT0_LRCLK_POLARITY_NORMAL;
>>> +             break;
>>> +     case SND_SOC_DAIFMT_NB_IF:
>>> +             /* Invert frame clock */
>>> +             val = SUN8I_I2S_FMT0_LRCLK_POLARITY_INVERTED |
>>> +                     SUN8I_I2S_FMT0_BCLK_POLARITY_NORMAL;
>>> +             break;
>>> +     case SND_SOC_DAIFMT_NB_NF:
>>> +             /* Nothing to do for both normal cases */
>>> +             val = SUN8I_I2S_FMT0_BCLK_POLARITY_NORMAL |
>>> +                     SUN8I_I2S_FMT0_LRCLK_POLARITY_NORMAL;
>>> +             break;
>>> +     default:
>>> +             return -EINVAL;
>>> +     }
>>> +
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_FMT0_REG,
>>> +                        SUN8I_I2S_FMT0_BCLK_POLARITY_MASK |
>>> +                        SUN8I_I2S_FMT0_LRCLK_POLARITY_MASK,
>>> +                        val);
>>> +
>>> +     /* Set significant bits in our FIFOs */
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_FIFO_CTRL_REG,
>>> +                        SUN4I_I2S_FIFO_CTRL_TX_MODE_MASK |
>>> +                        SUN4I_I2S_FIFO_CTRL_RX_MODE_MASK,
>>> +                        SUN4I_I2S_FIFO_CTRL_TX_MODE(1) |
>>> +                        SUN4I_I2S_FIFO_CTRL_RX_MODE(1));
>>> +     return 0;
>>> +}
>>> +
>>>  static void sun4i_i2s_start_capture(struct sun4i_i2s *i2s)
>>>  {
>>>       /* Flush RX FIFO */
>>> @@ -471,8 +725,8 @@ static int sun4i_i2s_startup(struct snd_pcm_substream *substream,
>>>       int ret = 0;
>>>
>>>       /* Enable the whole hardware block */
>>> -     regmap_write(i2s->regmap, SUN4I_I2S_CTRL_REG,
>>> -                  SUN4I_I2S_CTRL_GL_EN);
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
>>> +                        SUN4I_I2S_CTRL_GL_EN, SUN4I_I2S_CTRL_GL_EN);
>>
>> Why? This needs to be explained.
>>
>>>
>>>       /* Enable the first output line */
>>>       regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
>>> @@ -500,7 +754,8 @@ static void sun4i_i2s_shutdown(struct snd_pcm_substream *substream,
>>>                          SUN4I_I2S_CTRL_SDO_EN_MASK, 0);
>>>
>>>       /* Disable the whole hardware block */
>>> -     regmap_write(i2s->regmap, SUN4I_I2S_CTRL_REG, 0);
>>> +     regmap_update_bits(i2s->regmap, SUN4I_I2S_CTRL_REG,
>>> +                        SUN4I_I2S_CTRL_GL_EN, 0);
>>
>> Ditto.
>>
>>>  }
>>>
>>>  static int sun4i_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
>>> @@ -525,6 +780,15 @@ static const struct snd_soc_dai_ops sun4i_i2s_dai_ops = {
>>>       .trigger        = sun4i_i2s_trigger,
>>>  };
>>>
>>> +static const struct snd_soc_dai_ops sun8i_i2s_dai_ops = {
>>> +     .hw_params      = sun8i_i2s_hw_params,
>>> +     .set_fmt        = sun8i_i2s_set_fmt,
>>> +     .set_sysclk     = sun4i_i2s_set_sysclk,
>>> +     .shutdown       = sun4i_i2s_shutdown,
>>> +     .startup        = sun4i_i2s_startup,
>>> +     .trigger        = sun4i_i2s_trigger,
>>> +};
>>> +
>>>  static int sun4i_i2s_dai_probe(struct snd_soc_dai *dai)
>>>  {
>>>       struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai);
>>> @@ -572,11 +836,11 @@ static bool sun4i_i2s_rd_reg(struct device *dev, unsigned int reg)
>>>       }
>>>  }
>>>
>>> +
>>
>> This one looks unnecessary
>>
>>>  static bool sun4i_i2s_wr_reg(struct device *dev, unsigned int reg)
>>>  {
>>>       switch (reg) {
>>>       case SUN4I_I2S_FIFO_RX_REG:
>>> -     case SUN4I_I2S_FIFO_STA_REG:
>>
>> This needs to be explained
>>
>>>               return false;
>>>
>>>       default:
>>> @@ -588,6 +852,7 @@ static bool sun4i_i2s_volatile_reg(struct device *dev, unsigned int reg)
>>>  {
>>>       switch (reg) {
>>>       case SUN4I_I2S_FIFO_RX_REG:
>>> +     case SUN4I_I2S_FIFO_STA_REG:
>>
>> Ditto.
>>
>>>       case SUN4I_I2S_INT_STA_REG:
>>>       case SUN4I_I2S_RX_CNT_REG:
>>>       case SUN4I_I2S_TX_CNT_REG:
>>> @@ -598,6 +863,34 @@ static bool sun4i_i2s_volatile_reg(struct device *dev, unsigned int reg)
>>>       }
>>>  }
>>>
>>> +static bool sun8i_i2s_rd_reg(struct device *dev, unsigned int reg)
>>> +{
>>> +     switch (reg) {
>>> +     case SUN8I_I2S_FIFO_TX_REG:
>>> +             return false;
>>> +
>>> +     default:
>>> +             return true;
>>> +     }
>>> +}
>>
>> It also applies to the old generation.
>>
>>> +static bool sun8i_i2s_volatile_reg(struct device *dev, unsigned int reg)
>>> +{
>>> +     switch (reg) {
>>> +     case SUN4I_I2S_FIFO_RX_REG:
>>> +     case SUN4I_I2S_FIFO_CTRL_REG:
>>> +     case SUN4I_I2S_FIFO_STA_REG:
>>> +     case SUN8I_I2S_INT_STA_REG:
>>> +     case SUN4I_I2S_RX_CNT_REG:
>>> +     case SUN4I_I2S_TX_CNT_REG:
>>> +     case SUN4I_I2S_TX_CHAN_MAP_REG:
>>> +             return true;
>>> +
>>> +     default:
>>> +             return false;
>>> +     }
>>> +}
>>
>> Besides the H3 interrupt status, it looks duplicated. Can't we share
>> both implementations with a condition for that register?
>>
>>> +
>>>  static const struct reg_default sun4i_i2s_reg_defaults[] = {
>>>       { SUN4I_I2S_CTRL_REG, 0x00000000 },
>>>       { SUN4I_I2S_FMT0_REG, 0x0000000c },
>>> @@ -611,6 +904,20 @@ static const struct reg_default sun4i_i2s_reg_defaults[] = {
>>>       { SUN4I_I2S_RX_CHAN_MAP_REG, 0x00003210 },
>>>  };
>>>
>>> +static const struct reg_default sun8i_i2s_reg_defaults[] = {
>>> +     { SUN4I_I2S_CTRL_REG, 0x00060000 },
>>> +     { SUN4I_I2S_FMT0_REG, 0x00000033 },
>>> +     { SUN4I_I2S_FMT1_REG, 0x00000030 },
>>> +     { SUN4I_I2S_FIFO_CTRL_REG, 0x000400f0 },
>>> +     { SUN4I_I2S_DMA_INT_CTRL_REG, 0x00000000 },
>>> +     { SUN4I_I2S_CLK_DIV_REG, 0x00000000 },
>>> +     { SUN8I_I2S_TX_CHAN_CFG_REG, 0x00000000 },
>>> +     { SUN8I_I2S_TX_CHAN_SEL_REG, 0x00000000 },
>>> +     { SUN8I_I2S_TX_CHAN_MAP_REG, 0x00000000 },
>>> +     { SUN8I_I2S_RX_CHAN_SEL_REG, 0x00000000 },
>>> +     { SUN8I_I2S_RX_CHAN_MAP_REG, 0x00000000 },
>>> +};
>>> +
>>>  static const struct regmap_config sun4i_i2s_regmap_config = {
>>>       .reg_bits       = 32,
>>>       .reg_stride     = 4,
>>> @@ -625,6 +932,19 @@ static const struct regmap_config sun4i_i2s_regmap_config = {
>>>       .volatile_reg   = sun4i_i2s_volatile_reg,
>>>  };
>>>
>>> +static const struct regmap_config sun8i_i2s_regmap_config = {
>>> +     .reg_bits       = 32,
>>> +     .reg_stride     = 4,
>>> +     .val_bits       = 32,
>>> +     .max_register   = SUN8I_I2S_RX_CHAN_MAP_REG,
>>> +     .cache_type     = REGCACHE_FLAT,
>>> +     .reg_defaults   = sun8i_i2s_reg_defaults,
>>> +     .num_reg_defaults       = ARRAY_SIZE(sun8i_i2s_reg_defaults),
>>> +     .writeable_reg  = sun4i_i2s_wr_reg,
>>> +     .readable_reg   = sun8i_i2s_rd_reg,
>>> +     .volatile_reg   = sun8i_i2s_volatile_reg,
>>> +};
>>> +
>>>  static int sun4i_i2s_runtime_resume(struct device *dev)
>>>  {
>>>       struct sun4i_i2s *i2s = dev_get_drvdata(dev);
>>> @@ -684,6 +1004,13 @@ static const struct sun4i_i2s_quirks sun6i_a31_i2s_quirks = {
>>>       .ops                    = &sun4i_i2s_dai_ops,
>>>  };
>>>
>>> +static const struct sun4i_i2s_quirks sun8i_h3_i2s_quirks = {
>>> +     .has_reset              = true,
>>> +     .reg_offset_txdata      = SUN8I_I2S_FIFO_TX_REG,
>>> +     .sun4i_i2s_regmap       = &sun8i_i2s_regmap_config,
>>> +     .ops                    = &sun8i_i2s_dai_ops,
>>> +};
>>> +
>>>  static int sun4i_i2s_probe(struct platform_device *pdev)
>>>  {
>>>       struct sun4i_i2s *i2s;
>>> @@ -823,6 +1150,10 @@ static const struct of_device_id sun4i_i2s_match[] = {
>>>               .compatible = "allwinner,sun6i-a31-i2s",
>>>               .data = &sun6i_a31_i2s_quirks,
>>>       },
>>> +     {
>>> +             .compatible = "allwinner,sun8i-h3-i2s",
>>> +             .data = &sun8i_h3_i2s_quirks,
>>> +     },
>>>       {}
>>>  };
>>>  MODULE_DEVICE_TABLE(of, sun4i_i2s_match);
>>> --
>>> 2.13.2
>>>
>>
>> Thanks!
>> Maxime
>>
>> --
>> Maxime Ripard, Free Electrons
>> Embedded Linux and Kernel engineering
>> http://free-electrons.com
>
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