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Date: Thu, 30 Oct 2014 12:36:42 +0100
From: Antoine Tenart <antoine.tenart@...e-electrons.com>
To: Peter.Chen@...escale.com
Cc: Antoine Tenart <antoine.tenart@...e-electrons.com>,
alexandre.belloni@...e-electrons.com,
thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
jszhang@...vell.com, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] usb: chipidea: add a core function to setup ci_hdrc_platform_data
Add a function into the chipidea core to help drivers setup the internal
ci_hdrc_platform_data structure. This helps not duplicating common code.
The ci_hdrc_get_platdata function only setup non filled members of the
structure so that is is possible to give an already filled one. This is
what the ci_pdata_default parameter is for.
Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
---
drivers/usb/chipidea/core.c | 129 +++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/chipidea.h | 2 +
2 files changed, 131 insertions(+)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index ba0ac2723098..0ad55c10a903 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -535,6 +535,135 @@ static int ci_get_platdata(struct device *dev,
return 0;
}
+/*
+ * Getting a PHY or an USB PHY is optional:
+ * If no PHY or USB PHY is found, or if their subsystems aren't enabled,
+ * PHY and/or USB PHY will be set to NULL. Otherwise returns an error.
+ */
+static int ci_hdrc_get_phy(struct device *dev,
+ struct ci_hdrc_platform_data *ci_pdata)
+{
+ ci_pdata->phy = devm_phy_get(dev, "usb");
+ ci_pdata->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+
+ if (PTR_ERR(ci_pdata->phy) == -EPROBE_DEFER ||
+ PTR_ERR(ci_pdata->usb_phy) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ if (IS_ERR(ci_pdata->phy)) {
+ if (PTR_ERR(ci_pdata->phy) == -ENOSYS ||
+ PTR_ERR(ci_pdata->phy) == -ENODEV) {
+ ci_pdata->phy = NULL;
+ } else {
+ dev_err(dev, "Could not get PHY: %ld\n",
+ PTR_ERR(ci_pdata->phy));
+ return PTR_ERR(ci_pdata->phy);
+ }
+ }
+
+ if (IS_ERR(ci_pdata->usb_phy)) {
+ if (PTR_ERR(ci_pdata->usb_phy) == -ENXIO ||
+ PTR_ERR(ci_pdata->usb_phy) == -ENODEV) {
+ ci_pdata->usb_phy = NULL;
+ } else {
+ dev_err(dev, "Could not get USB PHY: %ld\n",
+ PTR_ERR(ci_pdata->usb_phy));
+ return PTR_ERR(ci_pdata->usb_phy);
+ }
+ }
+
+ return 0;
+}
+
+static int ci_hdrc_get_usb_phy_mode(struct device *dev,
+ struct ci_hdrc_platform_data *ci_pdata)
+{
+ if (!ci_pdata->phy_mode)
+ ci_pdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
+
+ if (!ci_pdata->dr_mode)
+ ci_pdata->dr_mode = of_usb_get_dr_mode(dev->of_node);
+
+ if (of_usb_get_maximum_speed(dev->of_node) == USB_SPEED_FULL)
+ ci_pdata->flags |= CI_HDRC_FORCE_FULLSPEED;
+
+ return 0;
+}
+
+/*
+ * Getting a regulator is optional:
+ * If no regulator is found, or if the regulator subsystem isn't enabled,
+ * the regulator will be set to NULL. Otherwise returns an error.
+ */
+static int ci_hdrc_get_regulator(struct device *dev,
+ struct ci_hdrc_platform_data *ci_pdata)
+{
+ ci_pdata->reg_vbus = devm_regulator_get(dev, "vbus");
+
+ if (IS_ERR(ci_pdata->reg_vbus)) {
+ if (PTR_ERR(ci_pdata->reg_vbus) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ if (PTR_ERR(ci_pdata->reg_vbus) == -ENODEV) {
+ ci_pdata->reg_vbus = NULL;
+ } else {
+ dev_err(dev, "Could not get regulator for vbus: %ld\n",
+ PTR_ERR(ci_pdata->reg_vbus));
+ return PTR_ERR(ci_pdata->reg_vbus);
+ }
+ }
+
+ return 0;
+}
+
+struct ci_hdrc_platform_data *ci_hdrc_get_platdata(struct device *dev,
+ struct ci_hdrc_platform_data *ci_pdata_default)
+{
+ struct ci_hdrc_platform_data *ci_pdata;
+ int ret;
+
+ if (!ci_pdata_default) {
+ ci_pdata = devm_kzalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
+ if (!ci_pdata)
+ return ERR_PTR(-ENOMEM);
+ } else {
+ ci_pdata = ci_pdata_default;
+ }
+
+ if (!ci_pdata->name)
+ ci_pdata->name = dev_name(dev);
+
+ if (!ci_pdata->phy && !ci_pdata->usb_phy) {
+ ret = ci_hdrc_get_phy(dev, ci_pdata);
+ if (ret)
+ return ERR_PTR(ret);
+ }
+
+ if (ci_pdata->usb_phy) {
+ ret = ci_hdrc_get_usb_phy_mode(dev, ci_pdata);
+ if (ret)
+ return ERR_PTR(ret);
+ }
+
+ if (ci_pdata->dr_mode == USB_DR_MODE_UNKNOWN)
+ ci_pdata->dr_mode = USB_DR_MODE_OTG;
+
+ if (ci_pdata->dr_mode != USB_DR_MODE_PERIPHERAL) {
+ if (!ci_pdata->reg_vbus) {
+ ret = ci_hdrc_get_regulator(dev, ci_pdata);
+ if (ret)
+ return ERR_PTR(ret);
+ }
+
+ if (!ci_pdata->tpl_support)
+ ci_pdata->tpl_support =
+ of_usb_host_tpl_support(dev->of_node);
+ }
+
+ return ci_pdata;
+}
+EXPORT_SYMBOL_GPL(ci_hdrc_get_platdata);
+
static DEFINE_IDA(ci_ida);
struct platform_device *ci_hdrc_add_device(struct device *dev,
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index c01bf4ea27b9..7bb7520da59b 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -39,6 +39,8 @@ struct ci_hdrc_platform_data {
/* Default offset of capability registers */
#define DEF_CAPOFFSET 0x100
+struct ci_hdrc_platform_data *ci_hdrc_get_platdata(struct device *dev,
+ struct ci_hdrc_platform_data *ci_pdata_default);
/* Add ci hdrc device */
struct platform_device *ci_hdrc_add_device(struct device *dev,
struct resource *res, int nres,
--
2.1.0
--
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