ASoC: fsi: add device tree support

Support for loading the Renesas FSI driver via devicetree.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 89 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/sound/renesas,fsi.txt b/Documentation/devicetree/bindings/sound/renesas,fsi.txt
new file mode 100644
index 000000000000..c5be003f413e
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/renesas,fsi.txt
@@ -0,0 +1,26 @@
+Renesas FSI
+
+Required properties:
+- compatible                    : "renesas,sh_fsi2" or "renesas,sh_fsi"
+- reg                           : Should contain the register physical address and length
+- interrupts                    : Should contain FSI interrupt
+
+- fsia,spdif-connection         : FSI is connected by S/PDFI
+- fsia,stream-mode-support      : FSI supports 16bit stream mode.
+- fsia,use-internal-clock       : FSI uses internal clock when master mode.
+
+- fsib,spdif-connection         : same as fsia
+- fsib,stream-mode-support      : same as fsia
+- fsib,use-internal-clock       : same as fsia
+
+Example:
+
+sh_fsi2: sh_fsi2@0xec230000 {
+        compatible = "renesas,sh_fsi2";
+        reg = <0xec230000 0x400>;
+        interrupts = <0 146 0x4>;
+
+        fsia,spdif-connection;
+        fsia,stream-mode-support;
+        fsia,use-internal-clock;
+};
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index ef34ef8e92ed..91576120cd47 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -16,6 +16,8 @@
 #include <linux/dma-mapping.h>
 #include <linux/pm_runtime.h>
 #include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/scatterlist.h>
 #include <linux/sh_dma.h>
 #include <linux/slab.h>
@@ -297,7 +299,7 @@ struct fsi_master {
         int irq;
         struct fsi_priv fsia;
         struct fsi_priv fsib;
-        struct fsi_core *core;
+        const struct fsi_core *core;
         spinlock_t lock;
 };
 
@@ -1887,6 +1889,33 @@ static struct snd_soc_platform_driver fsi_soc_platform = {
 /*
  *              platform function
  */
+static void fsi_of_parse(char *name,
+                         struct device_node *np,
+                         struct sh_fsi_port_info *info,
+                         struct device *dev)
+{
+        int i;
+        char prop[128];
+        unsigned long flags = 0;
+        struct {
+                char *name;
+                unsigned int val;
+        } of_parse_property[] = {
+                { "spdif-connection",           SH_FSI_FMT_SPDIF },
+                { "stream-mode-support",        SH_FSI_ENABLE_STREAM_MODE },
+                { "use-internal-clock",         SH_FSI_CLK_CPG },
+        };
+
+        for (i = 0; i < ARRAY_SIZE(of_parse_property); i++) {
+                sprintf(prop, "%s,%s", name, of_parse_property[i].name);
+                if (of_get_property(np, prop, NULL))
+                        flags |= of_parse_property[i].val;
+        }
+        info->flags = flags;
+
+        dev_dbg(dev, "%s flags : %lx\n", name, info->flags);
+}
+
 static void fsi_port_info_init(struct fsi_priv *fsi,
                                struct sh_fsi_port_info *info)
 {
@@ -1914,22 +1943,40 @@ static void fsi_handler_init(struct fsi_priv *fsi,
         }
 }
 
+static struct of_device_id fsi_of_match[];
 static int fsi_probe(struct platform_device *pdev)
 {
         struct fsi_master *master;
-        const struct platform_device_id *id_entry;
+        struct device_node *np = pdev->dev.of_node;
         struct sh_fsi_platform_info info;
+        const struct fsi_core *core;
         struct fsi_priv *fsi;
         struct resource *res;
         unsigned int irq;
         int ret;
 
         memset(&info, 0, sizeof(info));
-        if (pdev->dev.platform_data)
-                memcpy(&info, pdev->dev.platform_data, sizeof(info));
 
-        id_entry = pdev->id_entry;
-        if (!id_entry) {
+        core = NULL;
+        if (np) {
+                const struct of_device_id *of_id;
+
+                of_id = of_match_device(fsi_of_match, &pdev->dev);
+                if (of_id) {
+                        core = of_id->data;
+                        fsi_of_parse("fsia", np, &info.port_a, &pdev->dev);
+                        fsi_of_parse("fsib", np, &info.port_b, &pdev->dev);
+                }
+        } else {
+                const struct platform_device_id *id_entry = pdev->id_entry;
+                if (id_entry)
+                        core = (struct fsi_core *)id_entry->driver_data;
+
+                if (pdev->dev.platform_data)
+                        memcpy(&info, pdev->dev.platform_data, sizeof(info));
+        }
+
+        if (!core) {
                 dev_err(&pdev->dev, "unknown fsi device\n");
                 return -ENODEV;
         }
@@ -1956,7 +2003,7 @@ static int fsi_probe(struct platform_device *pdev)
 
         /* master setting */
         master->irq             = irq;
-        master->core            = (struct fsi_core *)id_entry->driver_data;
+        master->core            = core;
         spin_lock_init(&master->lock);
 
         /* FSI A setting */
@@ -1987,7 +2034,7 @@ static int fsi_probe(struct platform_device *pdev)
         dev_set_drvdata(&pdev->dev, master);
 
         ret = devm_request_irq(&pdev->dev, irq, &fsi_interrupt, 0,
-                          id_entry->name, master);
+                               dev_name(&pdev->dev), master);
         if (ret) {
                 dev_err(&pdev->dev, "irq request err\n");
                 goto exit_fsib;
@@ -2113,6 +2160,13 @@ static struct fsi_core fsi2_core = {
         .b_mclk = B_MST_CTLR,
 };
 
+static struct of_device_id fsi_of_match[] __devinitconst = {
+        { .compatible = "renesas,sh_fsi",       .data = &fsi1_core},
+        { .compatible = "renesas,sh_fsi2",      .data = &fsi2_core},
+        {},
+};
+MODULE_DEVICE_TABLE(of, fsi_of_match);
+
 static struct platform_device_id fsi_id_table[] = {
         { "sh_fsi",     (kernel_ulong_t)&fsi1_core },
         { "sh_fsi2",    (kernel_ulong_t)&fsi2_core },
@@ -2124,6 +2178,7 @@ static struct platform_driver fsi_driver = {
         .driver         = {
                 .name   = "fsi-pcm-audio",
                 .pm     = &fsi_pm_ops,
+                .of_match_table = fsi_of_match,
         },
         .probe          = fsi_probe,
         .remove         = fsi_remove,