From: Fabio Estevam fabio.estevam@nxp.com
On mx6ul the General Purpose Register 1 (GPR1) contains the following bits for enabling the output of the SAI MCLKs: SAI1_MCLK_DIR, SAI2_MCLK_DIR, SAI3_MCLK_DIR
Introduce "gpr" and "fsl,sai-enable-mclk" optional properties to allow the enablement of the SAI_MCLK outputs.
Tested on a imx6ul-evk board.
Signed-off-by: Fabio Estevam fabio.estevam@nxp.com --- .../devicetree/bindings/sound/fsl-sai.txt | 8 +++++ include/linux/mfd/syscon/imx6q-iomuxc-gpr.h | 3 ++ sound/soc/fsl/fsl_sai.c | 37 ++++++++++++++++++++++ 3 files changed, 48 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.txt b/Documentation/devicetree/bindings/sound/fsl-sai.txt index 044e5d7..86755bb 100644 --- a/Documentation/devicetree/bindings/sound/fsl-sai.txt +++ b/Documentation/devicetree/bindings/sound/fsl-sai.txt @@ -48,6 +48,14 @@ Required properties: receive data by following their own bit clocks and frame sync clocks separately.
+Optional properties (for mx6ul): + + - gpr : The phandle to the General Purpose Register (GPR) + node. + + - fsl,sai-enable-mclk : This is a boolean property. If present, indicates + that SAI will output the SAI MCLK clock. + Note: - If both fsl,sai-asynchronous and fsl,sai-synchronous-rx are absent, the default synchronous mode (sync Rx with Tx) will be used, which means both diff --git a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h index 238c8db..401f97e 100644 --- a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h +++ b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h @@ -447,5 +447,8 @@ #define IMX6UL_GPR1_ENET2_CLK_OUTPUT (0x1 << 18) #define IMX6UL_GPR1_ENET_CLK_DIR (0x3 << 17) #define IMX6UL_GPR1_ENET_CLK_OUTPUT (0x3 << 17) +#define IMX6UL_GPR1_SAI1_MCLK_DIR (0x1 << 19) +#define IMX6UL_GPR1_SAI2_MCLK_DIR (0x1 << 20) +#define IMX6UL_GPR1_SAI3_MCLK_DIR (0x1 << 21)
#endif /* __LINUX_IMX6Q_IOMUXC_GPR_H */ diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index 0754df7..311325e 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -21,6 +21,8 @@ #include <sound/core.h> #include <sound/dmaengine_pcm.h> #include <sound/pcm_params.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include "fsl_sai.h" #include "imx-pcm.h" @@ -785,11 +787,14 @@ static const struct regmap_config fsl_sai_regmap_config = { static int fsl_sai_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; + struct device_node *gpr_np = of_parse_phandle(np, "gpr", 0); struct fsl_sai *sai; + struct regmap *gpr; struct resource *res; void __iomem *base; char tmp[8]; int irq, ret, i; + u32 index;
sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); if (!sai) @@ -877,6 +882,38 @@ static int fsl_sai_probe(struct platform_device *pdev) fsl_sai_dai.symmetric_samplebits = 0; }
+ if (of_find_property(np, "fsl,sai-enable-mclk", NULL)) { + ret = of_property_read_u32(np, "sai-index", &index); + if (ret) { + dev_err(&pdev->dev, "could not read sai-index\n"); + return ret; + } + + gpr = syscon_node_to_regmap(gpr_np); + if (IS_ERR(gpr)) { + dev_err(&pdev->dev, "could not find gpr node\n"); + return PTR_ERR(gpr); + } + + switch (index) { + case 1: + regmap_update_bits(gpr, IOMUXC_GPR1, + IMX6UL_GPR1_SAI1_MCLK_DIR, + IMX6UL_GPR1_SAI1_MCLK_DIR); + break; + case 2: + regmap_update_bits(gpr, IOMUXC_GPR1, + IMX6UL_GPR1_SAI2_MCLK_DIR, + IMX6UL_GPR1_SAI2_MCLK_DIR); + break; + case 3: + regmap_update_bits(gpr, IOMUXC_GPR1, + IMX6UL_GPR1_SAI3_MCLK_DIR, + IMX6UL_GPR1_SAI3_MCLK_DIR); + break; + } + } + sai->dma_params_rx.addr = res->start + FSL_SAI_RDR; sai->dma_params_tx.addr = res->start + FSL_SAI_TDR; sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;