diff options
Diffstat (limited to 'drivers/phy/ti/phy-da8xx-usb.c')
| -rw-r--r-- | drivers/phy/ti/phy-da8xx-usb.c | 67 |
1 files changed, 53 insertions, 14 deletions
diff --git a/drivers/phy/ti/phy-da8xx-usb.c b/drivers/phy/ti/phy-da8xx-usb.c index d5f4fbc32b52..1d81a1e6ec6b 100644 --- a/drivers/phy/ti/phy-da8xx-usb.c +++ b/drivers/phy/ti/phy-da8xx-usb.c @@ -1,16 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver * * Copyright (C) 2016 David Lechner <david@lechnology.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/clk.h> @@ -22,11 +14,13 @@ #include <linux/phy/phy.h> #include <linux/platform_data/phy-da8xx-usb.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regmap.h> #define PHY_INIT_BITS (CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN) struct da8xx_usb_phy { + struct device *dev; struct phy_provider *phy_provider; struct phy *usb11_phy; struct phy *usb20_phy; @@ -47,6 +41,12 @@ static int da8xx_usb11_phy_power_on(struct phy *phy) regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, CFGCHIP2_USB1SUSPENDM); + /* + * USB1.1 can used USB2.0 output clock as reference clock so this is here to prevent USB2.0 + * from shutting PHY's power when USB1.1 might use it + */ + pm_runtime_get_sync(d_phy->dev); + return 0; } @@ -57,6 +57,7 @@ static int da8xx_usb11_phy_power_off(struct phy *phy) regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0); clk_disable_unprepare(d_phy->usb11_clk); + pm_runtime_put_sync(d_phy->dev); return 0; } @@ -126,8 +127,37 @@ static const struct phy_ops da8xx_usb20_phy_ops = { .owner = THIS_MODULE, }; +static int __maybe_unused da8xx_runtime_suspend(struct device *dev) +{ + struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); + + dev_dbg(dev, "Suspending ...\n"); + + regmap_set_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN); + + return 0; +} + +static int __maybe_unused da8xx_runtime_resume(struct device *dev) +{ + u32 mask = CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN | CFGCHIP2_PHY_PLLON; + struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); + u32 pll_status; + + regmap_update_bits(d_phy->regmap, CFGCHIP(2), mask, CFGCHIP2_PHY_PLLON); + + dev_dbg(dev, "Resuming ...\n"); + + return regmap_read_poll_timeout(d_phy->regmap, CFGCHIP(2), pll_status, + pll_status & CFGCHIP2_PHYCLKGD, 1000, 500000); +} + +static const struct dev_pm_ops da8xx_usb_phy_pm_ops = { + SET_RUNTIME_PM_OPS(da8xx_runtime_suspend, da8xx_runtime_resume, NULL) +}; + static struct phy *da8xx_usb_phy_of_xlate(struct device *dev, - struct of_phandle_args *args) + const struct of_phandle_args *args) { struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); @@ -155,6 +185,8 @@ static int da8xx_usb_phy_probe(struct platform_device *pdev) if (!d_phy) return -ENOMEM; + d_phy->dev = dev; + if (pdata) d_phy->regmap = pdata->cfgchip; else @@ -216,10 +248,18 @@ static int da8xx_usb_phy_probe(struct platform_device *pdev) regmap_write_bits(d_phy->regmap, CFGCHIP(2), PHY_INIT_BITS, PHY_INIT_BITS); + pm_runtime_set_active(dev); + devm_pm_runtime_enable(dev); + /* + * Prevent runtime pm from being ON by default. Users can enable + * it using power/control in sysfs. + */ + pm_runtime_forbid(dev); + return 0; } -static int da8xx_usb_phy_remove(struct platform_device *pdev) +static void da8xx_usb_phy_remove(struct platform_device *pdev) { struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev); @@ -227,8 +267,6 @@ static int da8xx_usb_phy_remove(struct platform_device *pdev) phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx"); phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci-da8xx"); } - - return 0; } static const struct of_device_id da8xx_usb_phy_ids[] = { @@ -242,7 +280,8 @@ static struct platform_driver da8xx_usb_phy_driver = { .remove = da8xx_usb_phy_remove, .driver = { .name = "da8xx-usb-phy", - .of_match_table = da8xx_usb_phy_ids, + .pm = &da8xx_usb_phy_pm_ops, + .of_match_table = da8xx_usb_phy_ids, }, }; |