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Subject[PATCH 25/39] usb: musb: ux500: add device tree probing support
Date
This patch will allow ux500-musb to be probed and configured solely from
configuration found in Device Tree.

Cc: Felipe Balbi <balbi@ti.com>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: linux-usb@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
.../devicetree/bindings/usb/ux500-usb.txt | 50 +++++++++++++++++++
drivers/usb/musb/ux500.c | 51 ++++++++++++++++++++
2 files changed, 101 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/ux500-usb.txt

diff --git a/Documentation/devicetree/bindings/usb/ux500-usb.txt b/Documentation/devicetree/bindings/usb/ux500-usb.txt
new file mode 100644
index 0000000..330d6ec
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ux500-usb.txt
@@ -0,0 +1,50 @@
+Ux500 MUSB
+
+Required properties:
+ - compatible : Should be "stericsson,db8500-musb"
+ - reg : Offset and length of registers
+ - interrupts : Interrupt; mode, number and trigger
+ - dr_mode : Dual-role; either host mode "host", peripheral mode "peripheral"
+ or both "otg"
+
+Optional properties:
+ - dmas : A list of dma channels;
+ dma-controller, event-line, fixed-channel, flags
+ - dma-names : An ordered list of channel names affiliated to the above
+
+Example:
+
+usb_per5@a03e0000 {
+ compatible = "stericsson,db8500-musb", "mentor,musb";
+ reg = <0xa03e0000 0x10000>;
+ interrupts = <0 23 0x4>;
+ interrupt-names = "mc";
+
+ dr_mode = "otg";
+
+ dmas = <&dma 38 0 0x2>, /* Logical - DevToMem */
+ <&dma 38 0 0x0>, /* Logical - MemToDev */
+ <&dma 37 0 0x2>, /* Logical - DevToMem */
+ <&dma 37 0 0x0>, /* Logical - MemToDev */
+ <&dma 36 0 0x2>, /* Logical - DevToMem */
+ <&dma 36 0 0x0>, /* Logical - MemToDev */
+ <&dma 19 0 0x2>, /* Logical - DevToMem */
+ <&dma 19 0 0x0>, /* Logical - MemToDev */
+ <&dma 18 0 0x2>, /* Logical - DevToMem */
+ <&dma 18 0 0x0>, /* Logical - MemToDev */
+ <&dma 17 0 0x2>, /* Logical - DevToMem */
+ <&dma 17 0 0x0>, /* Logical - MemToDev */
+ <&dma 16 0 0x2>, /* Logical - DevToMem */
+ <&dma 16 0 0x0>, /* Logical - MemToDev */
+ <&dma 39 0 0x2>, /* Logical - DevToMem */
+ <&dma 39 0 0x0>; /* Logical - MemToDev */
+
+ dma-names = "iep_1_9", "oep_1_9",
+ "iep_2_10", "oep_2_10",
+ "iep_3_11", "oep_3_11",
+ "iep_4_12", "oep_4_12",
+ "iep_5_13", "oep_5_13",
+ "iep_6_14", "oep_6_14",
+ "iep_7_15", "oep_7_15",
+ "iep_8", "oep_8";
+};
diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c
index 3cf10bc..f0beee7 100644
--- a/drivers/usb/musb/ux500.c
+++ b/drivers/usb/musb/ux500.c
@@ -25,6 +25,7 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb/musb-ux500.h>

@@ -194,14 +195,57 @@ static const struct musb_platform_ops ux500_ops = {
.set_vbus = ux500_musb_set_vbus,
};

+static struct musb_hdrc_platform_data *
+ux500_of_probe(struct platform_device *pdev, struct device_node *np)
+{
+ struct musb_hdrc_platform_data *pdata;
+ const char *mode;
+ int strlen;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ mode = of_get_property(np, "dr_mode", &strlen);
+ if (!mode) {
+ dev_err(&pdev->dev, "No 'dr_mode' property found\n");
+ return NULL;
+ }
+
+ if (strlen > 0) {
+ if (!strcmp(mode, "host"))
+ pdata->mode = MUSB_HOST;
+ if (!strcmp(mode, "otg"))
+ pdata->mode = MUSB_OTG;
+ if (!strcmp(mode, "peripheral"))
+ pdata->mode = MUSB_PERIPHERAL;
+ }
+
+ return pdata;
+}
+
static int ux500_probe(struct platform_device *pdev)
{
struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
struct platform_device *musb;
struct ux500_glue *glue;
struct clk *clk;
int ret = -ENOMEM;

+ if (!pdata) {
+ if (np) {
+ pdata = ux500_of_probe(pdev, np);
+ if (!pdata)
+ goto err0;
+
+ pdev->dev.platform_data = pdata;
+ } else {
+ dev_err(&pdev->dev, "no pdata or device tree found\n");
+ goto err0;
+ }
+ }
+
glue = kzalloc(sizeof(*glue), GFP_KERNEL);
if (!glue) {
dev_err(&pdev->dev, "failed to allocate glue context\n");
@@ -230,6 +274,7 @@ static int ux500_probe(struct platform_device *pdev)
musb->dev.parent = &pdev->dev;
musb->dev.dma_mask = &pdev->dev.coherent_dma_mask;
musb->dev.coherent_dma_mask = pdev->dev.coherent_dma_mask;
+ musb->dev.of_node = pdev->dev.of_node;

glue->dev = &pdev->dev;
glue->musb = musb;
@@ -328,12 +373,18 @@ static const struct dev_pm_ops ux500_pm_ops = {
#define DEV_PM_OPS NULL
#endif

+static const struct of_device_id ux500_match[] = {
+ { .compatible = "stericsson,db8500-musb", },
+ {}
+};
+
static struct platform_driver ux500_driver = {
.probe = ux500_probe,
.remove = ux500_remove,
.driver = {
.name = "musb-ux500",
.pm = DEV_PM_OPS,
+ .of_match_table = ux500_match,
},
};

--
1.7.10.4


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