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, 15 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/include/mach/asp.h b/arch/arm/mach-davinci/include/mach/asp.h
index 834725f1e81d..0847d2144f1f 100644
--- 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