ASoC: DaVinci: Added selection of clk input pin for McBSP

    When McBSP peripheral gets the clock from an external pin,
    there are three possible chooses, MCBSP_CLKX, MCBSP_CLKR
    and MCBSP_CLKS.
    evm-dm365 uses MCBSP_CLKR, instead in bmx board I have a different
    hardware connection and I use MCBSP_CLKS, so I have added
    this possibility.

    This patch has been developed against the:
        http://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux-davinci.git
    git tree and has been tested on bmx board (similar to dm365 evm)

Signed-off-by: Raffaele Recalcati <raffaele.recalcati@bticino.it>
Signed-off-by: Davide Bonfanti <davide.bonfanti@bticino.it>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Acked-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 24 insertions, 5 deletions

diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index c8f038cb4c5..ba5644b5fbb 100644
--- a/sound/soc/davinci/davinci-i2s.c
+++ b/sound/soc/davinci/davinci-i2s.c
@@ -122,6 +122,7 @@ static const unsigned char double_fmt[SNDRV_PCM_FORMAT_S32_LE + 1] = {
 };
 
 struct davinci_mcbsp_dev {
+        struct device *dev;
         struct davinci_pcm_dma_params   dma_params[2];
         void __iomem                    *base;
 #define MOD_DSP_A       0
@@ -153,6 +154,7 @@ struct davinci_mcbsp_dev {
 
         unsigned int fmt;
         int clk_div;
+        int clk_input_pin;
 };
 
 static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
@@ -279,11 +281,26 @@ static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
                         DAVINCI_MCBSP_PCR_CLKRM;
                 break;
         case SND_SOC_DAIFMT_CBM_CFS:
-                /* McBSP CLKR pin is the input for the Sample Rate Generator.
-                 * McBSP FSR and FSX are driven by the Sample Rate Generator. */
-                pcr = DAVINCI_MCBSP_PCR_SCLKME |
-                        DAVINCI_MCBSP_PCR_FSXM |
-                        DAVINCI_MCBSP_PCR_FSRM;
+                pcr = DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_FSXM;
+                /*
+                 * Selection of the clock input pin that is the
+                 * input for the Sample Rate Generator.
+                 * McBSP FSR and FSX are driven by the Sample Rate
+                 * Generator.
+                 */
+                switch (dev->clk_input_pin) {
+                case MCBSP_CLKS:
+                        pcr |= DAVINCI_MCBSP_PCR_CLKXM |
+                                DAVINCI_MCBSP_PCR_CLKRM;
+                        break;
+                case MCBSP_CLKR:
+                        pcr |= DAVINCI_MCBSP_PCR_SCLKME;
+                        break;
+                default:
+                        dev_err(dev->dev, "bad clk_input_pin\n");
+                        return -EINVAL;
+                }
+
                 break;
         case SND_SOC_DAIFMT_CBM_CFM:
                 /* codec is master */
@@ -644,6 +661,7 @@ static int davinci_i2s_probe(struct platform_device *pdev)
                         pdata->sram_size_playback;
                 dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].sram_size =
                         pdata->sram_size_capture;
+                dev->clk_input_pin = pdata->clk_input_pin;
         }
         dev->clk = clk_get(&pdev->dev, NULL);
         if (IS_ERR(dev->clk)) {
@@ -676,6 +694,7 @@ static int davinci_i2s_probe(struct platform_device *pdev)
                 goto err_free_mem;
         }
         dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel = res->start;
+        dev->dev = &pdev->dev;
 
         davinci_i2s_dai.private_data = dev;
         davinci_i2s_dai.capture.dma_data = dev->dma_params;