/* * Copyright 2011 Freescale Semiconductor, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include <linux/module.h> #include <linux/init.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/dma-mapping.h> #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/delay.h> #include <linux/time.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include "mxs-saif.h" #define MXS_SET_ADDR 0x4 #define MXS_CLR_ADDR 0x8 static struct mxs_saif *mxs_saif[2]; /* * SAIF is a little different with other normal SOC DAIs on clock using. * * For MXS, two SAIF modules are instantiated on-chip. * Each SAIF has a set of clock pins and can be operating in master * mode simultaneously if they are connected to different off-chip codecs. * Also, one of the two SAIFs can master or drive the clock pins while the * other SAIF, in slave mode, receives clocking from the master SAIF. * This also means that both SAIFs must operate at the same sample rate. * * We abstract this as each saif has a master, the master could be * itself or other saifs. In the generic saif driver, saif does not need * to know the different clkmux. Saif only needs to know who is its master * and operating its master to generate the proper clock rate for it. * The master id is provided in mach-specific layer according to different * clkmux setting. */ static int mxs_saif_set_dai_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); switch (clk_id) { case MXS_SAIF_MCLK: saif->mclk = freq; break; default: return -EINVAL; } return 0; } /* * Since SAIF may work on EXTMASTER mode, IOW, it's working BITCLK&LRCLK * is provided by other SAIF, we provide a interface here to get its master * from its master_id. * Note that the master could be itself. */ static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif) { return mxs_saif[saif->master_id]; } /* * Set SAIF clock and MCLK */ static int mxs_saif_set_clk(struct mxs_saif *saif, unsigned int mclk, unsigned int rate) { u32 scr; int ret; struct mxs_saif *master_saif; dev_dbg(saif->dev, "mclk %d rate %d\n", mclk, rate); /* Set master saif to generate proper clock */ master_saif = mxs_saif_get_master(saif); if (!master_saif) return -EINVAL; dev_dbg(saif->dev, "master saif%d\n", master_saif->id); /* Checking if can playback and capture simutaneously */ if (master_saif->ongoing && rate != master_saif->cur_rate) { dev_err(saif->dev, "can not change clock, master saif%d(rate %d) is ongoing\n", master_saif->id, master_saif->cur_rate); return -EINVAL; } scr = __raw_readl(master_saif->base + SAIF_CTRL); scr &= ~BM_SAIF_CTRL_BITCLK_MULT_RATE; scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; /* * Set SAIF clock * * The SAIF clock should be either 384*fs or 512*fs. * If MCLK is used, the SAIF clk ratio need to match mclk ratio. * For 32x mclk, set saif clk as 512*fs. * For 48x mclk, set saif clk as 384*fs. * * If MCLK is not used, we just set saif clk to 512*fs. */ clk_prepare_enable(master_saif->clk); if (master_saif->mclk_in_use) { if (mclk % 32 == 0) { scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; ret = clk_set_rate(master_saif->clk, 512 * rate); } else if (mclk % 48 == 0) { scr |= BM_SAIF_CTRL_BITCLK_BASE_RATE; ret = clk_set_rate(master_saif->clk, 384 * rate); } else { /* SAIF MCLK should be either 32x or 48x */ clk_disable_unprepare(master_saif->clk); return -EINVAL; } } else { ret = clk_set_rate(master_saif->clk, 512 * rate); scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE; } clk_disable_unprepare(master_saif->clk); if (ret) return ret; master_saif->cur_rate = rate; if (!master_saif->mclk_in_use) { __raw_writel(scr, master_saif->base + SAIF_CTRL); return 0; } /* * Program the over-sample rate for MCLK output * * The available MCLK range is 32x, 48x... 512x. The rate * could be from 8kHz to 192kH. */ switch (mclk / rate) { case 32: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(4); break; case 64: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3); break; case 128: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2); break; case 256: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1); break; case 512: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0); break; case 48: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3); break; case 96: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2); break; case 192: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1); break; case 384: scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0); break; default: return -EINVAL; } __raw_writel(scr, master_saif->base + SAIF_CTRL); return 0; } /* * Put and disable MCLK. */ int mxs_saif_put_mclk(unsigned int saif_id) { struct mxs_saif *saif = mxs_saif[saif_id]; u32 stat; if (!saif) return -EINVAL; stat = __raw_readl(saif->base + SAIF_STAT); if (stat & BM_SAIF_STAT_BUSY) { dev_err(saif->dev, "error: busy\n"); return -EBUSY; } clk_disable_unprepare(saif->clk); /* disable MCLK output */ __raw_writel(BM_SAIF_CTRL_CLKGATE, saif->base + SAIF_CTRL + MXS_SET_ADDR); __raw_writel(BM_SAIF_CTRL_RUN, saif->base + SAIF_CTRL + MXS_CLR_ADDR); saif->mclk_in_use = 0; return 0; } EXPORT_SYMBOL_GPL(mxs_saif_put_mclk); /* * Get MCLK and set clock rate, then enable it * * This interface is used for codecs who are using MCLK provided * by saif. */ int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk, unsigned int rate) { struct mxs_saif *saif = mxs_saif[saif_id]; u32 stat; int ret; struct mxs_saif *master_saif; if (!saif) return -EINVAL; /* Clear Reset */ __raw_writel(BM_SAIF_CTRL_SFTRST, saif->base + SAIF_CTRL + MXS_CLR_ADDR); /* FIXME: need clear clk gate for register r/w */ __raw_writel(BM_SAIF_CTRL_CLKGATE, saif->base + SAIF_CTRL + MXS_CLR_ADDR); master_saif = mxs_saif_get_master(saif); if (saif != master_saif) { dev_err(saif->dev, "can not get mclk from a non-master saif\n"); return -EINVAL; } stat = __raw_readl(saif->base + SAIF_STAT); if (stat & BM_SAIF_STAT_BUSY) { dev_err(saif->dev, "error: busy\n"); return -EBUSY; } saif->mclk_in_use = 1; ret = mxs_saif_set_clk(saif, mclk, rate); if (ret) return ret; ret = clk_prepare_enable(saif->clk); if (ret) return ret; /* enable MCLK output */ __raw_writel(BM_SAIF_CTRL_RUN, saif->base + SAIF_CTRL + MXS_SET_ADDR); return 0; } EXPORT_SYMBOL_GPL(mxs_saif_get_mclk); /* * SAIF DAI format configuration. * Should only be called when port is inactive. */ static int mxs_saif_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { u32 scr, stat; u32 scr0; struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); stat = __raw_readl(saif->base + SAIF_STAT); if (stat & BM_SAIF_STAT_BUSY) { dev_err(cpu_dai->dev, "error: busy\n"); return -EBUSY; } scr0 = __raw_readl(saif->base + SAIF_CTRL); scr0 = scr0 & ~BM_SAIF_CTRL_BITCLK_EDGE & ~BM_SAIF_CTRL_LRCLK_POLARITY \ & ~BM_SAIF_CTRL_JUSTIFY & ~BM_SAIF_CTRL_DELAY; scr = 0; /* DAI mode */ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: /* data frame low 1clk before data */ scr |= BM_SAIF_CTRL_DELAY; scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; break; case SND_SOC_DAIFMT_LEFT_J: /* data frame high with data */ scr &= ~BM_SAIF_CTRL_DELAY; scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; scr &= ~BM_SAIF_CTRL_JUSTIFY; break; default: return -EINVAL; } /* DAI clock inversion */ switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_IB_IF: scr |= BM_SAIF_CTRL_BITCLK_EDGE; scr |= BM_SAIF_CTRL_LRCLK_POLARITY; break; case SND_SOC_DAIFMT_IB_NF: scr |= BM_SAIF_CTRL_BITCLK_EDGE; scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; break; case SND_SOC_DAIFMT_NB_IF: scr &= ~BM_SAIF_CTRL_BITCLK_EDGE; scr |= BM_SAIF_CTRL_LRCLK_POLARITY; break; case SND_SOC_DAIFMT_NB_NF: scr &= ~BM_SAIF_CTRL_BITCLK_EDGE; scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY; break; } /* * Note: We simply just support master mode since SAIF TX can only * work as master. * Here the master is relative to codec side. * Saif internally could be slave when working on EXTMASTER mode. * We just hide this to machine driver. */ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBS_CFS: if (saif->id == saif->master_id) scr &= ~BM_SAIF_CTRL_SLAVE_MODE; else scr |= BM_SAIF_CTRL_SLAVE_MODE; __raw_writel(scr | scr0, saif->base + SAIF_CTRL); break; default: return -EINVAL; } return 0; } static int mxs_saif_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); /* clear error status to 0 for each re-open */ saif->fifo_underrun = 0; saif->fifo_overrun = 0; /* Clear Reset for normal operations */ __raw_writel(BM_SAIF_CTRL_SFTRST, saif->base + SAIF_CTRL + MXS_CLR_ADDR); /* clear clock gate */ __raw_writel(BM_SAIF_CTRL_CLKGATE, saif->base + SAIF_CTRL + MXS_CLR_ADDR); clk_prepare(saif->clk); return 0; } static void mxs_saif_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); clk_unprepare(saif->clk); } /* * Should only be called when port is inactive. * although can be called multiple times by upper layers. */ static int mxs_saif_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); struct mxs_saif *master_saif; u32 scr, stat; int ret; master_saif = mxs_saif_get_master(saif); if (!master_saif) return -EINVAL; /* mclk should already be set */ if (!saif->mclk && saif->mclk_in_use) { dev_err(cpu_dai->dev, "set mclk first\n"); return -EINVAL; } stat = __raw_readl(saif->base + SAIF_STAT); if (!saif->mclk_in_use && (stat & BM_SAIF_STAT_BUSY)) { dev_err(cpu_dai->dev, "error: busy\n"); return -EBUSY; } /* * Set saif clk based on sample rate. * If mclk is used, we also set mclk, if not, saif->mclk is * default 0, means not used. */ ret = mxs_saif_set_clk(saif, saif->mclk, params_rate(params)); if (ret) { dev_err(cpu_dai->dev, "unable to get proper clk\n"); return ret; } if (saif != master_saif) { /* * Set an initial clock rate for the saif internal logic to work * properly. This is important when working in EXTMASTER mode * that uses the other saif's BITCLK&LRCLK but it still needs a * basic clock which should be fast enough for the internal * logic. */ clk_enable(saif->clk); ret = clk_set_rate(saif->clk, 24000000); clk_disable(saif->clk); if (ret) return ret; clk_prepare(master_saif->clk); } scr = __raw_readl(saif->base + SAIF_CTRL); scr &= ~BM_SAIF_CTRL_WORD_LENGTH; scr &= ~BM_SAIF_CTRL_BITCLK_48XFS_ENABLE; switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: scr |= BF_SAIF_CTRL_WORD_LENGTH(0); break; case SNDRV_PCM_FORMAT_S20_3LE: scr |= BF_SAIF_CTRL_WORD_LENGTH(4); scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE; break; case SNDRV_PCM_FORMAT_S24_LE: scr |= BF_SAIF_CTRL_WORD_LENGTH(8); scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE; break; default: return -EINVAL; } /* Tx/Rx config */ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* enable TX mode */ scr &= ~BM_SAIF_CTRL_READ_MODE; } else { /* enable RX mode */ scr |= BM_SAIF_CTRL_READ_MODE; } __raw_writel(scr, saif->base + SAIF_CTRL); return 0; } static int mxs_saif_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); /* enable FIFO error irqs */ __raw_writel(BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN, saif->base + SAIF_CTRL + MXS_SET_ADDR); return 0; } static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai); struct mxs_saif *master_saif; u32 delay; int ret; master_saif = mxs_saif_get_master(saif); if (!master_saif) return -EINVAL; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: if (saif->state == MXS_SAIF_STATE_RUNNING) return 0; dev_dbg(cpu_dai->dev, "start\n"); ret = clk_enable(master_saif->clk); if (ret) { dev_err(saif->dev, "Failed to enable master clock\n"); return ret; } /* * If the saif's master is not itself, we also need to enable * itself clk for its internal basic logic to work. */ if (saif != master_saif) { ret = clk_enable(saif->clk); if (ret) { dev_err(saif->dev, "Failed to enable master clock\n"); clk_disable(master_saif->clk); return ret; } __raw_writel(BM_SAIF_CTRL_RUN, saif->base + SAIF_CTRL + MXS_SET_ADDR); } if (!master_saif->mclk_in_use) __raw_writel(BM_SAIF_CTRL_RUN, master_saif->base + SAIF_CTRL + MXS_SET_ADDR); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* * write data to saif data register to trigger * the transfer. * For 24-bit format the 32-bit FIFO register stores * only one channel, so we need to write twice. * This is also safe for the other non 24-bit formats. */ __raw_writel(0, saif->base + SAIF_DATA); __raw_writel(0, saif->base + SAIF_DATA); } else { /* * read data from saif data register to trigger * the receive. * For 24-bit format the 32-bit FIFO register stores * only one channel, so we need to read twice. * This is also safe for the other non 24-bit formats. */ __raw_readl(saif->base + SAIF_DATA); __raw_readl(saif->base + SAIF_DATA); } master_saif->ongoing = 1; saif->state = MXS_SAIF_STATE_RUNNING; dev_dbg(saif->dev, "CTRL 0x%x STAT 0x%x\n", __raw_readl(saif->base + SAIF_CTRL), __raw_readl(saif->base + SAIF_STAT)); dev_dbg(master_saif->dev, "CTRL 0x%x STAT 0x%x\n", __raw_readl(master_saif->base + SAIF_CTRL), __raw_readl(master_saif->base + SAIF_STAT)); break; case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: if (saif->state == MXS_SAIF_STATE_STOPPED) return 0; dev_dbg(cpu_dai->dev, "stop\n"); /* wait a while for the current sample to complete */ delay = USEC_PER_SEC / master_saif->cur_rate; if (!master_saif->mclk_in_use) { __raw_writel(BM_SAIF_CTRL_RUN, master_saif->base + SAIF_CTRL + MXS_CLR_ADDR); udelay(delay); } clk_disable(master_saif->clk); if (saif != master_saif) { __raw_writel(BM_SAIF_CTRL_RUN, saif->base + SAIF_CTRL + MXS_CLR_ADDR); udelay(delay); clk_disable(saif->clk); } master_saif->ongoing = 0; saif->state = MXS_SAIF_STATE_STOPPED; break; default: return -EINVAL; } return 0; } #define MXS_SAIF_RATES SNDRV_PCM_RATE_8000_192000 #define MXS_SAIF_FORMATS \ (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \ SNDRV_PCM_FMTBIT_S24_LE) static const struct snd_soc_dai_ops mxs_saif_dai_ops = { .startup = mxs_saif_startup, .shutdown = mxs_saif_shutdown, .trigger = mxs_saif_trigger, .prepare = mxs_saif_prepare, .hw_params = mxs_saif_hw_params, .set_sysclk = mxs_saif_set_dai_sysclk, .set_fmt = mxs_saif_set_dai_fmt, }; static int mxs_saif_dai_probe(struct snd_soc_dai *dai) { struct mxs_saif *saif = dev_get_drvdata(dai->dev); snd_soc_dai_set_drvdata(dai, saif); return 0; } static struct snd_soc_dai_driver mxs_saif_dai = { .name = "mxs-saif", .probe = mxs_saif_dai_probe, .playback = { .channels_min = 2, .channels_max = 2, .rates = MXS_SAIF_RATES, .formats = MXS_SAIF_FORMATS, }, .capture = { .channels_min = 2, .channels_max = 2, .rates = MXS_SAIF_RATES, .formats = MXS_SAIF_FORMATS, }, .ops = &mxs_saif_dai_ops, }; static const struct snd_soc_component_driver mxs_saif_component = { .name = "mxs-saif", }; static irqreturn_t mxs_saif_irq(int irq, void *dev_id) { struct mxs_saif *saif = dev_id; unsigned int stat; stat = __raw_readl(saif->base + SAIF_STAT); if (!(stat & (BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ | BM_SAIF_STAT_FIFO_OVERFLOW_IRQ))) return IRQ_NONE; if (stat & BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ) { dev_dbg(saif->dev, "underrun!!! %d\n", ++saif->fifo_underrun); __raw_writel(BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ, saif->base + SAIF_STAT + MXS_CLR_ADDR); } if (stat & BM_SAIF_STAT_FIFO_OVERFLOW_IRQ) { dev_dbg(saif->dev, "overrun!!! %d\n", ++saif->fifo_overrun); __raw_writel(BM_SAIF_STAT_FIFO_OVERFLOW_IRQ, saif->base + SAIF_STAT + MXS_CLR_ADDR); } dev_dbg(saif->dev, "SAIF_CTRL %x SAIF_STAT %x\n", __raw_readl(saif->base + SAIF_CTRL), __raw_readl(saif->base + SAIF_STAT)); return IRQ_HANDLED; } static int mxs_saif_mclk_init(struct platform_device *pdev) { struct mxs_saif *saif = platform_get_drvdata(pdev); struct device_node *np = pdev->dev.of_node; struct clk *clk; int ret; clk = clk_register_divider(&pdev->dev, "mxs_saif_mclk", __clk_get_name(saif->clk), 0, saif->base + SAIF_CTRL, BP_SAIF_CTRL_BITCLK_MULT_RATE, 3, 0, NULL); if (IS_ERR(clk)) { ret = PTR_ERR(clk); if (ret == -EEXIST) return 0; dev_err(&pdev->dev, "failed to register mclk: %d\n", ret); return PTR_ERR(clk); } ret = of_clk_add_provider(np, of_clk_src_simple_get, clk); if (ret) return ret; return 0; } static int mxs_saif_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct resource *iores; struct mxs_saif *saif; int irq, ret = 0; struct device_node *master; if (!np) return -EINVAL; saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL); if (!saif) return -ENOMEM; ret = of_alias_get_id(np, "saif"); if (ret < 0) return ret; else saif->id = ret; if (saif->id >= ARRAY_SIZE(mxs_saif)) { dev_err(&pdev->dev, "get wrong saif id\n"); return -EINVAL; } /* * If there is no "fsl,saif-master" phandle, it's a saif * master. Otherwise, it's a slave and its phandle points * to the master. */ master = of_parse_phandle(np, "fsl,saif-master", 0); if (!master) { saif->master_id = saif->id; } else { ret = of_alias_get_id(master, "saif"); if (ret < 0) return ret; else saif->master_id = ret; if (saif->master_id >= ARRAY_SIZE(mxs_saif)) { dev_err(&pdev->dev, "get wrong master id\n"); return -EINVAL; } } mxs_saif[saif->id] = saif; saif->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(saif->clk)) { ret = PTR_ERR(saif->clk); dev_err(&pdev->dev, "Cannot get the clock: %d\n", ret); return ret; } iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); saif->base = devm_ioremap_resource(&pdev->dev, iores); if (IS_ERR(saif->base)) return PTR_ERR(saif->base); irq = platform_get_irq(pdev, 0); if (irq < 0) { ret = irq; dev_err(&pdev->dev, "failed to get irq resource: %d\n", ret); return ret; } saif->dev = &pdev->dev; ret = devm_request_irq(&pdev->dev, irq, mxs_saif_irq, 0, dev_name(&pdev->dev), saif); if (ret) { dev_err(&pdev->dev, "failed to request irq\n"); return ret; } platform_set_drvdata(pdev, saif); /* We only support saif0 being tx and clock master */ if (saif->id == 0) { ret = mxs_saif_mclk_init(pdev); if (ret) dev_warn(&pdev->dev, "failed to init clocks\n"); } ret = devm_snd_soc_register_component(&pdev->dev, &mxs_saif_component, &mxs_saif_dai, 1); if (ret) { dev_err(&pdev->dev, "register DAI failed\n"); return ret; } ret = mxs_pcm_platform_register(&pdev->dev); if (ret) { dev_err(&pdev->dev, "register PCM failed: %d\n", ret); return ret; } return 0; } static const struct of_device_id mxs_saif_dt_ids[] = { { .compatible = "fsl,imx28-saif", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, mxs_saif_dt_ids); static struct platform_driver mxs_saif_driver = { .probe = mxs_saif_probe, .driver = { .name = "mxs-saif", .of_match_table = mxs_saif_dt_ids, }, }; module_platform_driver(mxs_saif_driver); MODULE_AUTHOR("Freescale Semiconductor, Inc."); MODULE_DESCRIPTION("MXS ASoC SAIF driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:mxs-saif");