On 04/30/2014 03:59 AM, Mark Brown wrote:
> On Fri, Apr 25, 2014 at 09:46:11AM +0530, Tushar Behera wrote:
>> On 04/24/2014 07:09 PM, Mark Brown wrote:
>
>>> defined. Why is that? Also, why is the secondary I2S playback stream
>>> not supported (this may be a reason to restrict to only the one I2S
>>> interface)?
>
>> AFAICS, I2S driver doesn't support secondary DAI with DT (dai type is
>> always TYPE_PRI in case of DT). Hence I could not find a setup to test
>> secondary dai with this board.
>
> OK, that should be fixed at some point. I will hopefully be able to
> look at this myself on the Arndale Octa though (or Chromebook or Arndale
> once XCLKOUT is implemented).
>
XCLKOUT mux register (0x10040a00) is not part of core clock SFR range,
rather it is part of pmu-system-controller node.
One option would be to add a clock provider for XCLKOUT. That would
require me to extend current clock driver to get the
pmu-system-controller phandle which in turn is dependent on the patch to
early initialize syscon driver.[1]
Will it be okay to configure XCLKOUT in snow sound-card driver by taking
the phandle of pmu-system-controller from device tree? The
implementation is provided below.
[1] article.gmane.org/gmane.linux.kernel/1679446
diff --git a/sound/soc/samsung/snow.c b/sound/soc/samsung/snow.c
index 0fa89a4..d7fe7a0 100644
--- a/sound/soc/samsung/snow.c
+++ b/sound/soc/samsung/snow.c
@@ -15,6 +15,7 @@
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/mfd/syscon.h>
#include <sound/soc.h>
@@ -22,6 +23,10 @@
#define FIN_PLL_RATE 24000000
+#define XCLKOUT_OFFSET 0x0a00
+#define XCLKOUT_PARENT_MASK 0x1f00
+#define XCLKOUT_PARENT_XXTI 0x1000
+
static struct snd_soc_dai_link snow_dai[] = {
{
.name = "Primary",
@@ -66,6 +71,7 @@ static int snow_probe(struct platform_device *pdev)
{
struct snd_soc_card *card = &snow_snd;
struct device_node *i2s_node, *codec_node;
+ struct regmap *pmureg;
int i, ret;
i2s_node = of_parse_phandle(pdev->dev.of_node,
@@ -84,6 +90,19 @@ static int snow_probe(struct platform_device *pdev)
return -EINVAL;
}
+ /*
+ * On Snow board, SoC XCLKOUT line is connected to codec MCLK.
+ * One option would be to add another clock provider to configure
+ * XCLKOUT mux register. Else we can get pmu-syscon phandle from
+ * device tree and update the register here.
+ */
+ pmureg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+ "samsung,pmu-syscon");
+ if (!IS_ERR(pmureg)) {
+ regmap_update_bits(pmureg, XCLKOUT_OFFSET,
+ XCLKOUT_PARENT_MASK, XCLKOUT_PARENT_XXTI);
+ }
+
for (i = 0; i < ARRAY_SIZE(snow_dai); i++) {
snow_dai[i].codec_of_node = codec_node;
snow_dai[i].cpu_of_node = i2s_node;
--
Tushar Behera
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
