[PATCH 06/17] phy: omap-usb2: use *syscon* framework to power on/off the PHY

Kishon Vijay Abraham I
2015-06-23T12:00:42Z

Deprecate using phy-omap-control driver to power on/off the PHY,
and use *syscon* framework to do the same. This handles
powering on/off the PHY for the USB2 PHYs used in various TI SoCs.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
Documentation/devicetree/bindings/phy/ti-phy.txt | 6 +-
drivers/phy/phy-omap-usb2.c | 101 ++++++++++++++++++----
include/linux/phy/omap_usb.h | 18 ++++
3 files changed, 107 insertions(+), 18 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
index b9101b9..5bfe461 100644
--- a/Documentation/devicetree/bindings/phy/ti-phy.txt
+++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
@@ -42,10 +42,14 @@ Required properties:
* "wkupclk" - wakeup clock.
* "refclk" - reference clock (optional).

-Optional properties:
+Deprecated properties:
- ctrl-module : phandle of the control module used by PHY driver to power on
the PHY.

+Recommended properies:
+- syscon-phy-power : phandle/offset pair. Phandle to the system control
+ module and the register offset to power on/off the PHY.
+
This is usually a subnode of ocp2scp to which it is connected.

usb2phy@4a0ad080 {
diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
index 2f7220f..180b066 100644
--- a/drivers/phy/phy-omap-usb2.c
+++ b/drivers/phy/phy-omap-usb2.c
@@ -29,6 +29,8 @@
#include <linux/delay.h>
#include <linux/phy/omap_control_phy.h>
#include <linux/phy/phy.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
#include <linux/of_platform.h>

#define USB2PHY_DISCON_BYP_LATCH (1 << 31)
@@ -97,22 +99,65 @@ static int omap_usb_set_peripheral(struct usb_otg *otg,
return 0;
}

-static int omap_usb_power_off(struct phy *x)
+static int omap_usb_phy_power(struct omap_usb *phy, int on)
{
- struct omap_usb *phy = phy_get_drvdata(x);
+ u32 val = 0;
+ u32 mask;
+ int ret;

- omap_control_phy_power(phy->control_dev, 0);
+ if (phy->syscon_phy_power) {
+ switch (phy->type) {
+ case TYPE_USB2:
+ mask = OMAP_DEV_PHY_PD;
+ if (!on)
+ val = OMAP_DEV_PHY_PD;
+ break;
+ case TYPE_DRA7USB2:
+ mask = OMAP_USB2_PHY_PD;
+ if (!on)
+ val = OMAP_USB2_PHY_PD;
+ break;
+ case TYPE_AM437USB2:
+ mask = AM437X_USB2_PHY_PD |
+ AM437X_USB2_OTG_PD |
+ AM437X_USB2_OTGVDET_EN |
+ AM437X_USB2_OTGSESSEND_EN;
+ if (on) {
+ val = AM437X_USB2_OTGVDET_EN |
+ AM437X_USB2_OTGSESSEND_EN;
+ } else {
+ val = AM437X_USB2_PHY_PD | AM437X_USB2_OTG_PD;
+ }
+ break;
+ default:
+ dev_err(phy->dev, "%s: type %d not recognized\n",
+ __func__, phy->type);
+ return -EINVAL;
+ }
+
+ ret = regmap_update_bits(phy->syscon_phy_power, phy->power_reg,
+ mask, val);
+ if (ret < 0)
+ return ret;
+ } else {
+ omap_control_phy_power(phy->control_dev, on);
+ }

return 0;
}

-static int omap_usb_power_on(struct phy *x)
+static int omap_usb_power_off(struct phy *x)
{
struct omap_usb *phy = phy_get_drvdata(x);

- omap_control_phy_power(phy->control_dev, 1);
+ return omap_usb_phy_power(phy, false);
+}

- return 0;
+static int omap_usb_power_on(struct phy *x)
+{
+ struct omap_usb *phy = phy_get_drvdata(x);
+
+ return omap_usb_phy_power(phy, true);
}

static int omap_usb_init(struct phy *x)
@@ -147,26 +192,31 @@ static struct phy_ops ops = {
static const struct usb_phy_data omap_usb2_data = {
.label = "omap_usb2",
.flags = OMAP_USB2_HAS_START_SRP | OMAP_USB2_HAS_SET_VBUS,
+ .type = TYPE_USB2,
};

static const struct usb_phy_data omap5_usb2_data = {
.label = "omap5_usb2",
.flags = 0,
+ .type = TYPE_USB2,
};

static const struct usb_phy_data dra7x_usb2_data = {
.label = "dra7x_usb2",
.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
+ .type = TYPE_USB2,
};

static const struct usb_phy_data dra7x_usb2_phy2_data = {
.label = "dra7x_usb2_phy2",
.flags = OMAP_USB2_CALIBRATE_FALSE_DISCONNECT,
+ .type = TYPE_DRA7USB2,
};

static const struct usb_phy_data am437x_usb2_data = {
.label = "am437x_usb2",
.flags = 0,
+ .type = TYPE_AM437USB2,
};

static const struct of_device_id omap_usb2_id_table[] = {
@@ -223,6 +273,7 @@ static int omap_usb2_probe(struct platform_device *pdev)
return -ENOMEM;

phy->dev = &pdev->dev;
+ phy->type = phy_data->type;

phy->phy.dev = phy->dev;
phy->phy.label = phy_data->label;
@@ -237,20 +288,36 @@ static int omap_usb2_probe(struct platform_device *pdev)
phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
}

- control_node = of_parse_phandle(node, "ctrl-module", 0);
- if (!control_node) {
- dev_err(&pdev->dev, "Failed to get control device phandle\n");
- return -EINVAL;
- }
+ phy->syscon_phy_power = syscon_regmap_lookup_by_phandle(node,
+ "syscon-phy-power");
+ if (IS_ERR(phy->syscon_phy_power)) {
+ dev_info(&pdev->dev,
+ "can't get syscon-phy-power, using control device\n");
+ phy->syscon_phy_power = NULL;
+
+ control_node = of_parse_phandle(node, "ctrl-module", 0);
+ if (!control_node) {
+ dev_err(&pdev->dev,
+ "Failed to get control device phandle\n");
+ return -EINVAL;
+ }

- control_pdev = of_find_device_by_node(control_node);
- if (!control_pdev) {
- dev_err(&pdev->dev, "Failed to get control device\n");
- return -EINVAL;
+ control_pdev = of_find_device_by_node(control_node);
+ if (!control_pdev) {
+ dev_err(&pdev->dev, "Failed to get control device\n");
+ return -EINVAL;
+ }
+ phy->control_dev = &control_pdev->dev;
+ } else {
+ if (of_property_read_u32_index(node,
+ "syscon-phy-power", 1,
+ &phy->power_reg)) {
+ dev_err(&pdev->dev,
+ "couldn't get power reg. offset\n");
+ return -EINVAL;
+ }
}

- phy->control_dev = &control_pdev->dev;
-
otg->set_host = omap_usb_set_host;
otg->set_peripheral = omap_usb_set_peripheral;
if (phy_data->flags & OMAP_USB2_HAS_SET_VBUS)
diff --git a/include/linux/phy/omap_usb.h b/include/linux/phy/omap_usb.h
index dc2c541..de933ab 100644
--- a/include/linux/phy/omap_usb.h
+++ b/include/linux/phy/omap_usb.h
@@ -30,6 +30,12 @@ struct usb_dpll_params {
u32 mf;
};

+enum omap_usb_phy_type {
+ TYPE_USB2, /* USB2_PHY, power down in CONTROL_DEV_CONF */
+ TYPE_DRA7USB2, /* USB2 PHY, power and power_aux e.g. DRA7 */
+ TYPE_AM437USB2, /* USB2 PHY, power e.g. AM437x */
+};
+
struct omap_usb {
struct usb_phy phy;
struct phy_companion *comparator;
@@ -40,11 +46,15 @@ struct omap_usb {
struct clk *wkupclk;
struct clk *optclk;
u8 flags;
+ enum omap_usb_phy_type type;
+ struct regmap *syscon_phy_power; /* ctrl. reg. acces */
+ unsigned int power_reg; /* power reg. index within syscon */
};

struct usb_phy_data {
const char *label;
u8 flags;
+ enum omap_usb_phy_type type;
};

/* Driver Flags */
@@ -52,6 +62,14 @@ struct usb_phy_data {
#define OMAP_USB2_HAS_SET_VBUS (1 << 1)
#define OMAP_USB2_CALIBRATE_FALSE_DISCONNECT (1 << 2)

+#define OMAP_DEV_PHY_PD BIT(0)
+#define OMAP_USB2_PHY_PD BIT(28)
+
+#define AM437X_USB2_PHY_PD BIT(0)
+#define AM437X_USB2_OTG_PD BIT(1)
+#define AM437X_USB2_OTGVDET_EN BIT(19)
+#define AM437X_USB2_OTGSESSEND_EN BIT(20)
+
#define phy_to_omapusb(x) container_of((x), struct omap_usb, phy)

#if defined(CONFIG_OMAP_USB2) || defined(CONFIG_OMAP_USB2_MODULE)
--
1.7.9.5