linux-kernel - Re: [linux-sunxi] [PATCH v3 08/12] ASoC: sun4i-i2s: Add mclk enable regmap field

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Date:   Wed, 2 Aug 2017 11:20:27 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Code Kipper <codekipper@...il.com>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        "Andrea Venturi (pers)" <be17068@...rbole.bo.it>
Subject: Re: [linux-sunxi] [PATCH v3 08/12] ASoC: sun4i-i2s: Add mclk enable
 regmap field

On Sat, Jul 29, 2017 at 10:17 PM,  <codekipper@...il.com> wrote:
> From: Marcus Cooper <codekipper@...il.com>
>
> The location of the mclk output enable bit is different on newer
> SoCs. Use a regmap field to enable it.
>
> Signed-off-by: Marcus Cooper <codekipper@...il.com>
> ---
>  sound/soc/sunxi/sun4i-i2s.c | 22 +++++++++++++++++++---
>  1 file changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index 90daa974bd27..6d8d2c4a675b 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -74,7 +74,7 @@
>  #define SUN4I_I2S_INT_STA_REG          0x20
>
>  #define SUN4I_I2S_CLK_DIV_REG          0x24
> -#define SUN4I_I2S_CLK_DIV_MCLK_EN              BIT(7)
> +#define SUN4I_I2S_CLK_DIV_MCLK_EN              7
>  #define SUN4I_I2S_CLK_DIV_BCLK_MASK            GENMASK(6, 4)
>  #define SUN4I_I2S_CLK_DIV_BCLK(bclk)                   ((bclk) << 4)
>  #define SUN4I_I2S_CLK_DIV_MCLK_MASK            GENMASK(3, 0)
> @@ -101,6 +101,7 @@
>   * @mclk_offset: Value by which mclkdiv needs to be adjusted.
>   * @bclk_offset: Value by which bclkdiv needs to be adjusted.
>   * @fmt_offset: Value by which wss and sr needs to be adjusted.
> + * @field_clkdiv_mclk_en: regmap field to enable mclk output.
>   * @field_fmt_set_wss: regmap field to set word select size.
>   * @field_fmt_set_sr: regmap field to set sample resolution.
>   * @field_fmt_set_bclk_polarity: regmap field to set clk polarity.
> @@ -119,6 +120,7 @@ struct sun4i_i2s_quirks {
>         unsigned int                    fmt_offset;
>
>         /* Register fields for i2s */
> +       struct reg_field                field_clkdiv_mclk_en;
>         struct reg_field                field_fmt_set_wss;
>         struct reg_field                field_fmt_set_sr;
>         struct reg_field                field_fmt_set_bclk_polarity;
> @@ -141,6 +143,7 @@ struct sun4i_i2s {
>         struct snd_dmaengine_dai_dma_data       playback_dma_data;
>
>         /* Register fields for i2s */
> +       struct regmap_field     *field_clkdiv_mclk_en;
>         struct regmap_field     *field_fmt_set_wss;
>         struct regmap_field     *field_fmt_set_sr;
>         struct regmap_field     *field_fmt_set_bclk_polarity;
> @@ -279,8 +282,9 @@ static int sun4i_i2s_set_clk_rate(struct sun4i_i2s *i2s,
>
>         regmap_write(i2s->regmap, SUN4I_I2S_CLK_DIV_REG,
>                      SUN4I_I2S_CLK_DIV_BCLK(bclk_div) |
> -                    SUN4I_I2S_CLK_DIV_MCLK(mclk_div) |
> -                    SUN4I_I2S_CLK_DIV_MCLK_EN);
> +                    SUN4I_I2S_CLK_DIV_MCLK(mclk_div));
> +
> +       regmap_field_write(i2s->field_clkdiv_mclk_en, 1);
>
>         return 0;
>  }
> @@ -710,6 +714,9 @@ static const struct sun4i_i2s_quirks sun4i_a10_i2s_quirks = {
>         .has_reset              = false,
>         .reg_offset_txdata      = SUN4I_I2S_FIFO_TX_REG,
>         .sun4i_i2s_regmap       = &sun4i_i2s_regmap_config,
> +       .field_clkdiv_mclk_en   = REG_FIELD(SUN4I_I2S_CLK_DIV_REG,
> +                                           SUN4I_I2S_CLK_DIV_MCLK_EN,
> +                                           SUN4I_I2S_CLK_DIV_MCLK_EN),

Nit: just use raw number to match all the other lines. And you won't
need to change the macro.

ChenYu