The kirkwood i2s driver is used without DT in the Kirkwood machine. This patch adds a DT compatible definition for use in other Marvell machines as the Armada 88AP510 (Dove).
Signed-off-by: Jean-Francois Moine moinejf@free.fr --- v3 - change compatible from kirkwood to mvebu (Andrew Lunn) v2 - this patch replaces the previous [PATCH 2/2] ARM: kirkwood: extend the kirkwood i2s driver for DT usage - 2 possible clocks (Sebastian Hesselbarth) - shorter io mapping (Andrew Lunn) - less #ifdef's --- Documentation/devicetree/bindings/sound/kirkwood-i2s.txt | 24 +++++++++++ sound/soc/kirkwood/kirkwood-i2s.c | 58 ++++++++++++++++++++------ 2 files changed, 70 insertions(+), 12 deletions(-)
diff --git a/Documentation/devicetree/bindings/sound/kirkwood-i2s.txt b/Documentation/devicetree/bindings/sound/kirkwood-i2s.txt new file mode 100644 index 0000000..8f1e534 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/kirkwood-i2s.txt @@ -0,0 +1,24 @@ +* mvebu (Kirkwood, Dove, Armada 370) I2S controller + +Required properties: + +- compatible: "marvell,mvebu-i2s" + +- reg: physical base address of the controller and length of memory mapped + region. + +- interrupts: list of two irq numbers. + The first irq is used for data flow and the second one is used for errors. + +- clocks: one or two phandles. + The first one is mandatory and defines the internal clock. + The second one is optional and defines an external clock. + +Example: + +i2s1: audio-controller@b4000 { + compatible = "marvell,mvebu-i2s"; + reg = <0xb4000 0x2210>; + interrupts = <21>, <22>; + clocks = <&gate_clk 13>; +}; diff --git a/sound/soc/kirkwood/kirkwood-i2s.c b/sound/soc/kirkwood/kirkwood-i2s.c index 4c9dad3..019e340 100644 --- a/sound/soc/kirkwood/kirkwood-i2s.c +++ b/sound/soc/kirkwood/kirkwood-i2s.c @@ -12,7 +12,6 @@
#include <linux/init.h> #include <linux/module.h> -#include <linux/platform_device.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/mbus.h> @@ -22,6 +21,8 @@ #include <sound/pcm_params.h> #include <sound/soc.h> #include <linux/platform_data/asoc-kirkwood.h> +#include <linux/of.h> + #include "kirkwood.h"
#define DRV_NAME "kirkwood-i2s" @@ -461,6 +462,7 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev) struct snd_soc_dai_driver *soc_dai = &kirkwood_i2s_dai; struct kirkwood_dma_data *priv; struct resource *mem; + struct device_node *np; int err;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); @@ -481,24 +483,45 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev) return -ENXIO; }
- if (!data) { - dev_err(&pdev->dev, "no platform data ?!\n"); - return -EINVAL; + /* get the DT or static parameters */ + np = pdev->dev.of_node; + if (np) { + struct of_phandle_args clkspec; + + priv->burst = 128; /* might be 32 or 128 */ + priv->clk = of_clk_get(np, 0); /* internal clock */ + err = of_parse_phandle_with_args(np, + "clocks", "#clock-cells", 1, + &clkspec); + if (err) { + priv->extclk = ERR_PTR(-EINVAL); /* no external clock */ + } else { + priv->extclk = of_clk_get(np, 1); + if (IS_ERR(priv->extclk)) { + err = -EPROBE_DEFER; + goto fail; + } + } + } else { + if (!data) { + dev_err(&pdev->dev, "no platform data ?!\n"); + return -EINVAL; + } + priv->burst = data->burst; + priv->clk = clk_get(&pdev->dev, NULL); + priv->extclk = clk_get(&pdev->dev, "extclk"); }
- priv->burst = data->burst; - - priv->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(priv->clk)) { dev_err(&pdev->dev, "no clock\n"); - return PTR_ERR(priv->clk); + err = PTR_ERR(priv->clk); + goto fail; }
err = clk_prepare_enable(priv->clk); if (err < 0) - return err; + goto fail;
- priv->extclk = clk_get(&pdev->dev, "extclk"); if (!IS_ERR(priv->extclk)) { if (priv->extclk == priv->clk) { clk_put(priv->extclk); @@ -515,7 +538,7 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev) priv->ctl_rec = KIRKWOOD_RECCTL_SIZE_24;
/* Select the burst size */ - if (data->burst == 32) { + if (priv->burst == 32) { priv->ctl_play |= KIRKWOOD_PLAYCTL_BURST_32; priv->ctl_rec |= KIRKWOOD_RECCTL_BURST_32; } else { @@ -528,12 +551,13 @@ static int kirkwood_i2s_dev_probe(struct platform_device *pdev) if (!err) return 0; dev_err(&pdev->dev, "snd_soc_register_component failed\n"); - +fail: if (!IS_ERR(priv->extclk)) { clk_disable_unprepare(priv->extclk); clk_put(priv->extclk); } clk_disable_unprepare(priv->clk); + clk_put(priv->clk);
return err; } @@ -549,16 +573,26 @@ static int kirkwood_i2s_dev_remove(struct platform_device *pdev) clk_put(priv->extclk); } clk_disable_unprepare(priv->clk); + clk_put(priv->clk);
return 0; }
+#ifdef CONFIG_OF +static struct of_device_id kirkwood_i2s_of_match[] = { + { .compatible = "marvell,mvebu-i2s" }, + { } +}; +MODULE_DEVICE_TABLE(of, kirkwood_i2s_of_match); +#endif + static struct platform_driver kirkwood_i2s_driver = { .probe = kirkwood_i2s_dev_probe, .remove = kirkwood_i2s_dev_remove, .driver = { .name = DRV_NAME, .owner = THIS_MODULE, + .of_match_table = of_match_ptr(kirkwood_i2s_of_match), }, };