linux-kernel - [PATCH 2/2] davinci-mcasp: add option to use AHCLKX pin as clock in

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Date:	Fri, 06 Feb 2015 10:22:09 +0100
From:	Urs Fässler <urs.fassler@...esatwork.ch>
To:	perex@...ex.cz, tiwai@...e.de
CC:	urs.fassler@...esatwork.ch, lgirdwood@...il.com,
	broonie@...nel.org, peter.ujfalusi@...com, jsarha@...com,
	misael.lopez@...com, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] davinci-mcasp: add option to use AHCLKX pin as clock
 in

Signed-off-by: Urs Fässler <urs.fassler@...esatwork.ch>
---
 .../bindings/sound/davinci-mcasp-audio.txt         |  1 +
 sound/soc/davinci/davinci-mcasp.c                  | 26
+++++++++++++++++++---
 2 files changed, 24 insertions(+), 3 deletions(-)

diff --git
a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
index 46bc982..22a91d2 100644
--- a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
+++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
@@ -39,6 +39,7 @@ Optional properties:
   		 please refer to pinctrl-bindings.txt
 - fck_parent : Should contain a valid clock name which will be used as
parent
 	       for the McASP fck
+- ahclkx-pin : if set use AHCLKX pin for clock in instead of ACLKX
  Example:
 diff --git a/sound/soc/davinci/davinci-mcasp.c
b/sound/soc/davinci/davinci-mcasp.c
index 396cdec..3730288 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -85,6 +85,7 @@ struct davinci_mcasp {
  	int	sysclk_freq;
 	bool	bclk_master;
+	bool	ahclkx_pin;
  	/* McASP FIFO related */
 	u8	txnumevt;
@@ -429,7 +430,12 @@ static int davinci_mcasp_set_dai_fmt(struct
snd_soc_dai *cpu_dai,
 		break;
 	case SND_SOC_DAIFMT_CBM_CFS:
 		/* codec is clock master and frame slave */
-		mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXE);
+		if (mcasp->ahclkx_pin)
+			mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG,
+				ACLKXE);
+		else
+			mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG,
+				ACLKXE);
 		mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, AFSXE);
  		mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRE);
@@ -441,7 +447,12 @@ static int davinci_mcasp_set_dai_fmt(struct
snd_soc_dai *cpu_dai,
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		/* codec is clock and frame master */
-		mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXE);
+		if (mcasp->ahclkx_pin)
+			mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG,
+				ACLKXE);
+		else
+			mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG,
+				ACLKXE);
 		mcasp_clr_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, AFSXE);
  		mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRE);
@@ -542,7 +553,12 @@ static int davinci_mcasp_set_sysclk(struct
snd_soc_dai *dai, int clk_id,
 	struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
  	if (mcasp->bclk_master) {
-		mcasp_set_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG, AHCLKXE);
+		if (mcasp->ahclkx_pin)
+			mcasp_clr_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG,
+				AHCLKXE);
+		else
+			mcasp_set_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG,
+				AHCLKXE);
 		mcasp_set_bits(mcasp, DAVINCI_MCASP_AHCLKRCTL_REG, AHCLKRE);
 		mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AHCLKX);
 	} else {
@@ -1340,6 +1356,8 @@ static struct davinci_mcasp_pdata
*davinci_mcasp_set_pdata_from_of(
 	if (ret >= 0)
 		pdata->sram_size_capture = val;
 +	pdata->clk_input_pin = of_property_read_bool(np, "ahclkx-pin");
+
 	return  pdata;
  nodata:
@@ -1412,6 +1430,8 @@ static int davinci_mcasp_probe(struct
platform_device *pdev)
 		goto err;
 	}
 +	mcasp->ahclkx_pin = pdata->clk_input_pin;
+
 	mcasp->op_mode = pdata->op_mode;
 	/* sanity check for tdm slots parameter */
 	if (mcasp->op_mode == DAVINCI_MCASP_IIS_MODE) {
-- 
2.1.4



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