On 04/11/16 14:45, Petr Kulhavy wrote: > This adds DT support for the TI DA8xx/OMAP-L1x/AM17xx/AM18xx McBSP driver. > > Signed-off-by: Petr Kulhavy <petr@xxxxxxxxx> > --- > v1: initial > v2: remove "-audio" postfix from the compatible string > of_match_table renamed consistently with the rest of the file (davinci_i2s_match) > "channel-combine" property removed > devicetree DMA configuration in probe simplified > > sound/soc/davinci/Kconfig | 6 ++- > sound/soc/davinci/davinci-i2s.c | 116 +++++++++++++++++++++++++++++++--------- > 2 files changed, 95 insertions(+), 27 deletions(-) > > diff --git a/sound/soc/davinci/Kconfig b/sound/soc/davinci/Kconfig > index 50ca291cc225..6b732d8e5896 100644 > --- a/sound/soc/davinci/Kconfig > +++ b/sound/soc/davinci/Kconfig > @@ -16,7 +16,11 @@ config SND_EDMA_SOC > - DRA7xx family > > config SND_DAVINCI_SOC_I2S > - tristate > + tristate "DaVinci Multichannel Buffered Serial Port (McBSP) support" > + depends on SND_EDMA_SOC > + help > + Say Y or M here if you want to have support for McBSP IP found in > + Texas Instruments DaVinci DA850 SoCs. > > config SND_DAVINCI_SOC_MCASP > tristate "Multichannel Audio Serial Port (McASP) support" > diff --git a/sound/soc/davinci/davinci-i2s.c b/sound/soc/davinci/davinci-i2s.c > index ec98548a5fc9..a3f82d1a73dc 100644 > --- a/sound/soc/davinci/davinci-i2s.c > +++ b/sound/soc/davinci/davinci-i2s.c > @@ -4,9 +4,15 @@ > * Author: Vladimir Barinov, <vbarinov@xxxxxxxxxxxxxxxxx> > * Copyright: (C) 2007 MontaVista Software, Inc., <source@xxxxxxxxxx> > * > + * DT support (c) 2016 Petr Kulhavy, Barix AG <petr@xxxxxxxxx> > + * based on davinci-mcasp.c DT support > + * > * This program is free software; you can redistribute it and/or modify > * it under the terms of the GNU General Public License version 2 as > * published by the Free Software Foundation. > + * > + * TODO: > + * on DA850 implement HW FIFOs instead of DMA into DXR and DRR registers > */ > > #include <linux/init.h> > @@ -648,15 +654,62 @@ static const struct snd_soc_component_driver davinci_i2s_component = { > .name = "davinci-i2s", > }; > > +static struct snd_platform_data* > +davinci_i2s_set_pdata_from_of(struct platform_device *pdev) It is a bit misleading function name, would be better to name it as davinci_i2s_get_pdata() as it will fetch the legacy pdata or craft one when booting with DT. > +{ > + struct snd_platform_data *pdata = NULL; > + struct device_node *np; > + > + if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node) > + return dev_get_platdata(&pdev->dev); > + > + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); > + if (!pdata) > + return ERR_PTR(-ENOMEM); > + > + np = pdev->dev.of_node; ??? > + > + /* parse properties here */ > + > + /* > + * pdata->clk_input_pin is deliberately not exported to DT > + * and the default value of the clk_input_pin is MCBSP_CLKR. > + * The value MCBSP_CLKS makes no sense as it turns the CPU > + * to a bit clock master in the SND_SOC_DAIFMT_CBM_CFS mode > + * where it should be bit clock slave! > + */ > + > + return pdata; > +} > + > static int davinci_i2s_probe(struct platform_device *pdev) > { > + struct snd_dmaengine_dai_dma_data *dma_data; > + struct snd_platform_data *pdata; > struct davinci_mcbsp_dev *dev; > struct resource *mem, *res; > void __iomem *io_base; > int *dma; > int ret; > > - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + pdata = davinci_i2s_set_pdata_from_of(pdev); > + if (IS_ERR(pdata)) { > + dev_err(&pdev->dev, "Error populating platform data, err %ld\n", > + PTR_ERR(pdata)); > + return PTR_ERR(pdata); > + } The current driver does not use the pdata as far as I can see. Kind of strange. So now in DT boot you will allocate memory for the pdata, which is not used by the driver at all. I think we should implement the pdata handling in the driver first for the legacy mode, then probably having pdata allocated for DT case might make sense. > + > + mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu"); > + if (!mem) { > + dev_warn(&pdev->dev, > + "\"mpu\" mem resource not found, using index 0\n"); > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!mem) { > + dev_err(&pdev->dev, "no mem resource?\n"); > + return -ENODEV; > + } > + } > + > io_base = devm_ioremap_resource(&pdev->dev, mem); > if (IS_ERR(io_base)) > return PTR_ERR(io_base); > @@ -666,39 +719,43 @@ static int davinci_i2s_probe(struct platform_device *pdev) > if (!dev) > return -ENOMEM; > > - dev->clk = clk_get(&pdev->dev, NULL); > - if (IS_ERR(dev->clk)) > - return -ENODEV; > - clk_enable(dev->clk); > - > dev->base = io_base; > > - dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr = > - (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG); > - > - dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr = > - (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG); > + /* setup DMA, first TX, then RX */ > + dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK]; > + dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG); > > - /* first TX, then RX */ > res = platform_get_resource(pdev, IORESOURCE_DMA, 0); > - if (!res) { > - dev_err(&pdev->dev, "no DMA resource\n"); > - ret = -ENXIO; > - goto err_release_clk; > + if (res) { > + dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK]; > + *dma = res->start; > + dma_data->filter_data = dma; > + } else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) { > + dma_data->filter_data = "tx"; > + } else { > + dev_err(&pdev->dev, "Missing DMA tx resource\n"); > + return -ENODEV; > } > - dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK]; > - *dma = res->start; > - dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data = dma; > + > + dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE]; > + dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG); > > res = platform_get_resource(pdev, IORESOURCE_DMA, 1); > - if (!res) { > - dev_err(&pdev->dev, "no DMA resource\n"); > - ret = -ENXIO; > - goto err_release_clk; > + if (res) { > + dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE]; > + *dma = res->start; > + dma_data->filter_data = dma; > + } else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) { > + dma_data->filter_data = "rx"; > + } else { > + dev_err(&pdev->dev, "Missing DMA rx resource\n"); > + return -ENODEV; > } > - dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE]; > - *dma = res->start; > - dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data = dma; > + > + dev->clk = clk_get(&pdev->dev, NULL); > + if (IS_ERR(dev->clk)) > + return -ENODEV; > + clk_enable(dev->clk); > > dev->dev = &pdev->dev; > dev_set_drvdata(&pdev->dev, dev); > @@ -737,11 +794,18 @@ static int davinci_i2s_remove(struct platform_device *pdev) > return 0; > } > > +static const struct of_device_id davinci_i2s_match[] = { > + { .compatible = "ti,da850-mcbsp" }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, davinci_i2s_match); > + > static struct platform_driver davinci_mcbsp_driver = { > .probe = davinci_i2s_probe, > .remove = davinci_i2s_remove, > .driver = { > .name = "davinci-mcbsp", > + .of_match_table = of_match_ptr(davinci_i2s_match), > }, > }; The rest looks good to me. -- Péter -- 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