From patchwork Tue Mar 10 10:09:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Patrick Delaunay X-Patchwork-Id: 243473 List-Id: U-Boot discussion From: patrick.delaunay at st.com (Patrick Delaunay) Date: Tue, 10 Mar 2020 11:09:09 +0100 Subject: [PATCH v6 2/5] usb: host: dwc2: add phy support In-Reply-To: <20200310100912.28129-1-patrick.delaunay@st.com> References: <20200310100912.28129-1-patrick.delaunay@st.com> Message-ID: <20200310100912.28129-3-patrick.delaunay@st.com> Use generic phy to initialize the PHY associated to the DWC2 device and available in the device tree. This patch don't added dependency because when CONFIG_PHY is not activated, the generic PHY function are stubbed. Reviewed-by: Simon Goldschmidt Signed-off-by: Patrick Delaunay --- Changes in v6: None Changes in v5: - inverse logic for -ENOENT test on generic_phy_get_by_index result - Add some comments Changes in v4: None Changes in v3: None Changes in v2: - update dev_err - update commit message - change dev_err to dev_dbg for PHY function call - treat dwc2_shutdown_phy error drivers/usb/host/dwc2.c | 66 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c index e4efaf1e59..a8e64825b5 100644 --- a/drivers/usb/host/dwc2.c +++ b/drivers/usb/host/dwc2.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -37,6 +38,7 @@ struct dwc2_priv { #ifdef CONFIG_DM_REGULATOR struct udevice *vbus_supply; #endif + struct phy phy; #else uint8_t *aligned_buffer; uint8_t *status_buffer; @@ -1322,13 +1324,71 @@ static int dwc2_usb_ofdata_to_platdata(struct udevice *dev) return 0; } +static int dwc2_setup_phy(struct udevice *dev) +{ + struct dwc2_priv *priv = dev_get_priv(dev); + int ret; + + ret = generic_phy_get_by_index(dev, 0, &priv->phy); + if (ret) { + if (ret == -ENOENT) + return 0; /* no PHY, nothing to do */ + dev_err(dev, "Failed to get USB PHY: %d.\n", ret); + return ret; + } + + ret = generic_phy_init(&priv->phy); + if (ret) { + dev_dbg(dev, "Failed to init USB PHY: %d.\n", ret); + return ret; + } + + ret = generic_phy_power_on(&priv->phy); + if (ret) { + dev_dbg(dev, "Failed to power on USB PHY: %d.\n", ret); + generic_phy_exit(&priv->phy); + return ret; + } + + return 0; +} + +static int dwc2_shutdown_phy(struct udevice *dev) +{ + struct dwc2_priv *priv = dev_get_priv(dev); + int ret; + + /* PHY is not valid when generic_phy_get_by_index() = -ENOENT */ + if (!generic_phy_valid(&priv->phy)) + return 0; /* no PHY, nothing to do */ + + ret = generic_phy_power_off(&priv->phy); + if (ret) { + dev_dbg(dev, "Failed to power off USB PHY: %d.\n", ret); + return ret; + } + + ret = generic_phy_exit(&priv->phy); + if (ret) { + dev_dbg(dev, "Failed to power off USB PHY: %d.\n", ret); + return ret; + } + + return 0; +} + static int dwc2_usb_probe(struct udevice *dev) { struct dwc2_priv *priv = dev_get_priv(dev); struct usb_bus_priv *bus_priv = dev_get_uclass_priv(dev); + int ret; bus_priv->desc_before_addr = true; + ret = dwc2_setup_phy(dev); + if (ret) + return ret; + return dwc2_init_common(dev, priv); } @@ -1341,6 +1401,12 @@ static int dwc2_usb_remove(struct udevice *dev) if (ret) return ret; + ret = dwc2_shutdown_phy(dev); + if (ret) { + dev_dbg(dev, "Failed to shutdown USB PHY: %d.\n", ret); + return ret; + } + dwc2_uninit_common(priv->regs); reset_release_bulk(&priv->resets);