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>

diff --git a/arch/arm/mach-davinci/include/mach/asp.h b/arch/arm/mach-davinci/include/mach/asp.h
index 834725f..0847d21 100644 (file)
--- a/arch/arm/mach-davinci/include/mach/asp.h
+++ b/arch/arm/mach-davinci/include/mach/asp.h
@@ -63,6 +63,16 @@ struct snd_platform_data {
        unsigned sram_size_playback;
        unsigned sram_size_capture;
 
+       /*
+        * If McBSP peripheral gets the clock from an external pin,
+        * there are three chooses, that are MCBSP_CLKX, MCBSP_CLKR
+        * and MCBSP_CLKS.
+        * Depending on different hardware connections it is possible
+        * to use this setting to change the behaviour of McBSP
+        * driver. The dm365_clk_input_pin enum is available for dm365
+        */
+       int clk_input_pin;
+
        /* McASP specific fields */
        int tdm_slots;
        u8 op_mode;
@@ -78,6 +88,11 @@ enum {
        MCASP_VERSION_2,        /* DA8xx/OMAPL1x */
 };
 
+enum dm365_clk_input_pin {
+       MCBSP_CLKR = 0,         /* DM365 */
+       MCBSP_CLKS,
+};
+
 #define INACTIVE_MODE  0
 #define TX_MODE                1
 #define RX_MODE                2

diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c
index c8f038c..ba5644b 100644 (file)
--- 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;