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Subject[PATCH v2 07/12] usb: chipidea: add a generic driver
Date
Add a generic ChipIdea driver, with optional PHY and clock, to support
ChipIdea controllers that doesn't need specific functions.

Needed for the Marvell Berlin SoCs SUB controllers.

Signed-off-by: Antoine Ténart <antoine.tenart@free-electrons.com>
---
drivers/usb/chipidea/Makefile | 1 +
drivers/usb/chipidea/ci_hdrc_generic.c | 108 +++++++++++++++++++++++++++++++++
2 files changed, 109 insertions(+)
create mode 100644 drivers/usb/chipidea/ci_hdrc_generic.c

diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 2f099c7df7b5..c705f0fe7a00 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -20,4 +20,5 @@ endif

ifneq ($(CONFIG_OF),)
obj-$(CONFIG_USB_CHIPIDEA) += usbmisc_imx.o ci_hdrc_imx.o
+ obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc_generic.o
endif
diff --git a/drivers/usb/chipidea/ci_hdrc_generic.c b/drivers/usb/chipidea/ci_hdrc_generic.c
new file mode 100644
index 000000000000..27520710a1f7
--- /dev/null
+++ b/drivers/usb/chipidea/ci_hdrc_generic.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2014 Marvell Technology Group Ltd.
+ *
+ * Antoine Ténart <antoine.tenart@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/usb/chipidea.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/ulpi.h>
+
+#include "ci.h"
+
+struct ci_hdrc_generic_priv {
+ struct platform_device *ci_pdev;
+ struct clk *clk;
+};
+
+static int ci_hdrc_generic_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ci_hdrc_generic_priv *priv;
+ struct ci_hdrc_platform_data ci_pdata = {
+ .name = "ci_hdrc",
+ .capoffset = DEF_CAPOFFSET,
+ .flags = CI_HDRC_REQUIRE_TRANSCEIVER |
+ CI_HDRC_DISABLE_STREAMING,
+ };
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (!IS_ERR(priv->clk)) {
+ ret = clk_prepare_enable(priv->clk);
+ if (ret) {
+ dev_err(dev, "failed to enable the clock: %d\n", ret);
+ return ret;
+ }
+ }
+
+ ci_pdata.phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
+ if (IS_ERR(ci_pdata.phy))
+ /* PHY is optional */
+ ci_pdata.phy = NULL;
+
+ priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
+ pdev->num_resources, &ci_pdata);
+ if (IS_ERR(priv->ci_pdev)) {
+ ret = PTR_ERR(priv->ci_pdev);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev,
+ "failed to register ci_hdrc platform device: %d\n",
+ ret);
+ goto clk_err;
+ }
+
+ platform_set_drvdata(pdev, priv);
+
+ pm_runtime_no_callbacks(dev);
+ pm_runtime_enable(dev);
+
+ return 0;
+
+clk_err:
+ clk_disable_unprepare(priv->clk);
+ return ret;
+}
+
+static int ci_hdrc_generic_remove(struct platform_device *pdev)
+{
+ struct ci_hdrc_generic_priv *priv = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(&pdev->dev);
+ ci_hdrc_remove_device(priv->ci_pdev);
+ clk_disable_unprepare(priv->clk);
+
+ return 0;
+}
+
+static const struct of_device_id ci_hdrc_generic_of_match[] = {
+ { .compatible = "chipidea-usb" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ci_hdrc_generic_of_match);
+
+static struct platform_driver ci_hdrc_generic_driver = {
+ .probe = ci_hdrc_generic_probe,
+ .remove = ci_hdrc_generic_remove,
+ .driver = {
+ .name = "chipidea-usb",
+ .owner = THIS_MODULE,
+ .of_match_table = ci_hdrc_generic_of_match,
+ },
+};
+module_platform_driver(ci_hdrc_generic_driver);
+
+MODULE_DESCRIPTION("Generic ChipIdea HDRC USB binding");
+MODULE_AUTHOR("Antoine Ténart <antoine.tenart@free-electrons.com>");
+MODULE_LICENSE("GPL");
--
1.9.1
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