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

Roger Quadros
2015-06-24T11:35:06Z

On Tue, 23 Jun 2015 17:28:51 +0530
Kishon Vijay Abraham I <kishon@ti.com> wrote:

> 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)

This PD bit can be set in usb_phy_data and used by
a single block of code for all 3 phys.

> +#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
>

cheers,
-roger