Hi,
On Tue, Dec 20, 2016 at 03:55:24PM +0100, codekipper@xxxxxxxxx wrote:
> From: Marcus Cooper <codekipper@xxxxxxxxx>
>
> Newer SoCs have additional functionality so a quirks structure
> has been added to handle them. So far we've seen the use of a
> reset controller, a different address for the TXFIFO and varying
> register changes.
>
> This patch prepares the driver for these changes and adds the
> reset specifier.
>
> Signed-off-by: Marcus Cooper <codekipper@xxxxxxxxx>
> ---
> .../devicetree/bindings/sound/sun4i-i2s.txt | 2 +
> sound/soc/sunxi/sun4i-i2s.c | 47 ++++++++++++++++++++--
> 2 files changed, 45 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> index 7a2c0945fd22..494a881ccd21 100644
> --- a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> +++ b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
> @@ -18,6 +18,8 @@ Required properties:
> - "apb" : clock for the I2S bus interface
> - "mod" : module clock for the I2S controller
> - #sound-dai-cells : Must be equal to 0
> +- resets: reset specifier for the ahb reset (A31 and newer only)
> +
>
> Example:
>
> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
> index f24d19526603..80fe4f1d6e3b 100644
> --- a/sound/soc/sunxi/sun4i-i2s.c
> +++ b/sound/soc/sunxi/sun4i-i2s.c
> @@ -14,9 +14,11 @@
> #include <linux/clk.h>
> #include <linux/dmaengine.h>
> #include <linux/module.h>
> +#include <linux/of_device.h>
> #include <linux/platform_device.h>
> #include <linux/pm_runtime.h>
> #include <linux/regmap.h>
> +#include <linux/reset.h>
>
> #include <sound/dmaengine_pcm.h>
> #include <sound/pcm_params.h>
> @@ -92,6 +94,7 @@ struct sun4i_i2s {
> struct clk *bus_clk;
> struct clk *mod_clk;
> struct regmap *regmap;
> + struct reset_control *rst;
>
> unsigned int mclk_freq;
>
> @@ -104,6 +107,13 @@ struct sun4i_i2s_clk_div {
> u8 val;
> };
>
> +struct sun4i_i2s_quirks {
> + unsigned int reg_dac_txdata; /* TX FIFO offset for DMA config */
> + bool has_reset;
> + const struct regmap_config *sun4i_i2s_regmap;
> + const struct snd_soc_dai_ops *ops;
> +};
> +
This is quite hard to review without actual example of what you'll put
in there.
> static const struct sun4i_i2s_clk_div sun4i_i2s_bclk_div[] = {
> { .div = 2, .val = 0 },
> { .div = 4, .val = 1 },
> @@ -541,7 +551,6 @@ static struct snd_soc_dai_driver sun4i_i2s_dai = {
> .rates = SNDRV_PCM_RATE_8000_192000,
> .formats = SNDRV_PCM_FMTBIT_S16_LE,
> },
> - .ops = &sun4i_i2s_dai_ops,
> .symmetric_rates = 1,
> };
>
> @@ -655,6 +664,7 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
> {
> struct sun4i_i2s *i2s;
> struct resource *res;
> + const struct sun4i_i2s_quirks *quirks;
> void __iomem *regs;
> int irq, ret;
>
> @@ -680,8 +690,14 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
> return PTR_ERR(i2s->bus_clk);
> }
>
> + quirks = of_device_get_match_data(&pdev->dev);
> + if (quirks == NULL) {
> + dev_err(&pdev->dev, "Failed to determine the quirks to use\n");
> + return -ENODEV;
> + }
> +
> i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
> - &sun4i_i2s_regmap_config);
> + quirks->sun4i_i2s_regmap);
> if (IS_ERR(i2s->regmap)) {
> dev_err(&pdev->dev, "Regmap initialisation failed\n");
> return PTR_ERR(i2s->regmap);
> @@ -692,13 +708,25 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
> dev_err(&pdev->dev, "Can't get our mod clock\n");
> return PTR_ERR(i2s->mod_clk);
> }
> +
Spurious change?
>
> - i2s->playback_dma_data.addr = res->start + SUN4I_I2S_FIFO_TX_REG;
> + i2s->playback_dma_data.addr = res->start + quirks->reg_dac_txdata;
> i2s->playback_dma_data.maxburst = 4;
>
> i2s->capture_dma_data.addr = res->start + SUN4I_I2S_FIFO_RX_REG;
> i2s->capture_dma_data.maxburst = 4;
>
> + if (quirks->has_reset) {
> + i2s->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
> + if (IS_ERR(i2s->rst) && PTR_ERR(i2s->rst) == -EPROBE_DEFER) {
> + ret = -EPROBE_DEFER;
> + dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
> + goto err_pm_disable;
> + }
> + if (!IS_ERR(i2s->rst))
> + reset_control_deassert(i2s->rst);
> + }
> +
That reset line is not optional. The <A31 SoCs don't need it, and you
cover that case already, but it is definitely mandatory for the A31.
Thanks,
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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