drivers: phy: add generic PHY framework
The PHY framework provides a set of APIs to control a PHY. This API is
derived from the linux version of the generic PHY framework.
Currently the API supports init(), deinit(), power_on, power_off() and
reset(). The framework provides a way to get a reference to a phy from the
device-tree.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/phy/phy-uclass.c b/drivers/phy/phy-uclass.c
new file mode 100644
index 0000000..0d8bef7
--- /dev/null
+++ b/drivers/phy/phy-uclass.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <generic-phy.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static inline struct phy_ops *phy_dev_ops(struct udevice *dev)
+{
+ return (struct phy_ops *)dev->driver->ops;
+}
+
+static int generic_phy_xlate_offs_flags(struct phy *phy,
+ struct fdtdec_phandle_args *args)
+{
+ debug("%s(phy=%p)\n", __func__, phy);
+
+ if (args->args_count > 1) {
+ debug("Invaild args_count: %d\n", args->args_count);
+ return -EINVAL;
+ }
+
+ if (args->args_count)
+ phy->id = args->args[0];
+ else
+ phy->id = 0;
+
+
+ return 0;
+}
+
+int generic_phy_get_by_index(struct udevice *dev, int index,
+ struct phy *phy)
+{
+ struct fdtdec_phandle_args args;
+ struct phy_ops *ops;
+ int ret;
+ struct udevice *phydev;
+
+ debug("%s(dev=%p, index=%d, phy=%p)\n", __func__, dev, index, phy);
+
+ assert(phy);
+ ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
+ "phys", "#phy-cells", 0, index,
+ &args);
+ if (ret) {
+ debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = uclass_get_device_by_of_offset(UCLASS_PHY, args.node, &phydev);
+ if (ret) {
+ debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ phy->dev = phydev;
+
+ ops = phy_dev_ops(phydev);
+
+ if (ops->of_xlate)
+ ret = ops->of_xlate(phy, &args);
+ else
+ ret = generic_phy_xlate_offs_flags(phy, &args);
+ if (ret) {
+ debug("of_xlate() failed: %d\n", ret);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ return ret;
+}
+
+int generic_phy_get_by_name(struct udevice *dev, const char *phy_name,
+ struct phy *phy)
+{
+ int index;
+
+ debug("%s(dev=%p, name=%s, phy=%p)\n", __func__, dev, phy_name, phy);
+
+ index = fdt_stringlist_search(gd->fdt_blob, dev_of_offset(dev),
+ "phy-names", phy_name);
+ if (index < 0) {
+ debug("fdt_stringlist_search() failed: %d\n", index);
+ return index;
+ }
+
+ return generic_phy_get_by_index(dev, index, phy);
+}
+
+int generic_phy_init(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->init ? ops->init(phy) : 0;
+}
+
+int generic_phy_reset(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->reset ? ops->reset(phy) : 0;
+}
+
+int generic_phy_exit(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->exit ? ops->exit(phy) : 0;
+}
+
+int generic_phy_power_on(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->power_on ? ops->power_on(phy) : 0;
+}
+
+int generic_phy_power_off(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->power_off ? ops->power_off(phy) : 0;
+}
+
+UCLASS_DRIVER(phy) = {
+ .id = UCLASS_PHY,
+ .name = "phy",
+};