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Tue, 10 Jul 2018 07:53:12 +0000 From: Anson Huang To: linus.walleij@linaro.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Linux-imx@nxp.com Subject: [PATCH] gpio: mxc: add power management support Date: Tue, 10 Jul 2018 15:48:41 +0800 Message-Id: <1531208921-23342-1-git-send-email-Anson.Huang@nxp.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [119.31.174.66] X-ClientProxiedBy: HK0PR03CA0022.apcprd03.prod.outlook.com (2603:1096:203:2e::34) To DB5PR04MB1319.eurprd04.prod.outlook.com (2a01:111:e400:51cb::13) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 16d9172c-9240-43b6-beb9-08d5e63a309a X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989117)(5600053)(711020)(4534165)(4627221)(201703031133081)(201702281549075)(8990107)(48565401081)(2017052603328)(7153060)(7193020);SRVR:DB5PR04MB1319; X-Microsoft-Exchange-Diagnostics: 1;DB5PR04MB1319;3:vr4e8AlTrVhOPPMK6Eb5YD/JUPRLsSzA6hf72lYe3DrgonpCZoFB+vvJOt277NdFepZPO+CdPA8MMRTUWkSQZHI4HJiVhMrGC2aW4t+Ci6z1GDx85pw+SPIl2x/DlGvwaEy1yRSd7ToioSPomX2n93DShW+E0p8PHDVjb0PShO0mr+5EjNcRWpV/97NO3wuYvpNdXhuethn0ns+eAsKO75KLa6JbeuKWSFUwZpA5osmKokj9AbPeMQIOk2nlQ4q+;25:dK1U0hBI0Nzj0G343Wuxf3ZiOpq5ggzfi2NwfXAd0+CkJJqiL0O4sRcZNpSMCYrFY/gM+x1LFdhgVRt3cEsOvXtFzm8rG4PI8I9RSMtk6DjS+Lem0Dfql7qfsxYdU8ROf/nLOcyH2Is2skE34TWXtCyO3tE2truHW8WOS2w1p4LnM8KG5O+f0TcFI80RuCZEjLkRbK1uEPyK7j8hVbhWWieMbCBrrV1esxyvQLWn1Xu5YPGBEd/iP096KJ4gvODWfYec2sI7aqXfyjd57YOe1Ykh5rxP2KbMzHf8nKgxEWlIK0g1Vh0yXEgqmyohfV1BOFlANPuvCqW91t5Im4AtHw==;31:jkmQubsp3CBfH5FhhDwEhWKpi5lYc/hcETGSbF+fIunuoMP037znzwa9d4yKqYJd1L6E5BE5fg3GALsWD4D5BM7p5dd2IgJLIs4TKH8nPT+gBH5jw7m4Vlc2rNLn5Di0ja+kCR64uA+dWMoDU3CohxY7ce2Qv6JFkPIqEr0a4nowH9u4JTRtoQ4tm7V5MLfVRJ+k7UCW0LR0pzdGUWqPeMC4P7G0WkMdwMhaLgtN6Wc= X-MS-TrafficTypeDiagnostic: DB5PR04MB1319: Authentication-Results: spf=none (sender IP is ) smtp.mailfrom=anson.huang@nxp.com; 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This patch adds GPIO save/restore for those necessary registers, and put the save/restore operations in noirq suspend/resume phase, since GPIO is fundamental module which could be used by other peripherals' resume phase. Signed-off-by: Anson Huang --- drivers/gpio/gpio-mxc.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c index 2f28299..0fc52d8 100644 --- a/drivers/gpio/gpio-mxc.c +++ b/drivers/gpio/gpio-mxc.c @@ -45,6 +45,15 @@ struct mxc_gpio_hwdata { unsigned fall_edge; }; +struct mxc_gpio_reg_saved { + u32 icr1; + u32 icr2; + u32 imr; + u32 gdir; + u32 edge_sel; + u32 dr; +}; + struct mxc_gpio_port { struct list_head node; void __iomem *base; @@ -55,6 +64,7 @@ struct mxc_gpio_port { struct gpio_chip gc; struct device *dev; u32 both_edges; + struct mxc_gpio_reg_saved gpio_saved_reg; }; static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = { @@ -497,6 +507,8 @@ static int mxc_gpio_probe(struct platform_device *pdev) list_add_tail(&port->node, &mxc_gpio_ports); + platform_set_drvdata(pdev, port); + return 0; out_irqdomain_remove: @@ -507,11 +519,67 @@ static int mxc_gpio_probe(struct platform_device *pdev) return err; } +static void mxc_gpio_save_regs(struct mxc_gpio_port *port) +{ + if (mxc_gpio_hwtype == IMX21_GPIO) + return; + + port->gpio_saved_reg.icr1 = readl(port->base + GPIO_ICR1); + port->gpio_saved_reg.icr2 = readl(port->base + GPIO_ICR2); + port->gpio_saved_reg.imr = readl(port->base + GPIO_IMR); + port->gpio_saved_reg.gdir = readl(port->base + GPIO_GDIR); + port->gpio_saved_reg.edge_sel = readl(port->base + GPIO_EDGE_SEL); + port->gpio_saved_reg.dr = readl(port->base + GPIO_DR); +} + +static void mxc_gpio_restore_regs(struct mxc_gpio_port *port) +{ + if (mxc_gpio_hwtype == IMX21_GPIO) + return; + + writel(port->gpio_saved_reg.icr1, port->base + GPIO_ICR1); + writel(port->gpio_saved_reg.icr2, port->base + GPIO_ICR2); + writel(port->gpio_saved_reg.imr, port->base + GPIO_IMR); + writel(port->gpio_saved_reg.gdir, port->base + GPIO_GDIR); + writel(port->gpio_saved_reg.edge_sel, port->base + GPIO_EDGE_SEL); + writel(port->gpio_saved_reg.dr, port->base + GPIO_DR); +} + +static int __maybe_unused mxc_gpio_noirq_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct mxc_gpio_port *port = platform_get_drvdata(pdev); + + mxc_gpio_save_regs(port); + clk_disable_unprepare(port->clk); + + return 0; +} + +static int __maybe_unused mxc_gpio_noirq_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct mxc_gpio_port *port = platform_get_drvdata(pdev); + int ret; + + ret = clk_prepare_enable(port->clk); + if (ret) + return ret; + mxc_gpio_restore_regs(port); + + return 0; +} + +static const struct dev_pm_ops mxc_gpio_dev_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mxc_gpio_noirq_suspend, mxc_gpio_noirq_resume) +}; + static struct platform_driver mxc_gpio_driver = { .driver = { .name = "gpio-mxc", .of_match_table = mxc_gpio_dt_ids, .suppress_bind_attrs = true, + .pm = &mxc_gpio_dev_pm_ops, }, .probe = mxc_gpio_probe, .id_table = mxc_gpio_devtype, -- 2.7.4