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Thu, 16 Jul 2020 11:31:35 +0000 From: Joakim Zhang To: tglx@linutronix.de, jason@lakedaemon.net, maz@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de Cc: kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.or Subject: [PATCH 1/2] irqchip: imx-intmux: add system PM support Date: Fri, 17 Jul 2020 03:32:43 +0800 Message-Id: <20200716193244.31090-2-qiangqing.zhang@nxp.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200716193244.31090-1-qiangqing.zhang@nxp.com> References: <20200716193244.31090-1-qiangqing.zhang@nxp.com> Content-Type: text/plain X-ClientProxiedBy: SG2PR06CA0223.apcprd06.prod.outlook.com (2603:1096:4:68::31) To DB8PR04MB6795.eurprd04.prod.outlook.com (2603:10a6:10:fa::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (119.31.174.71) by SG2PR06CA0223.apcprd06.prod.outlook.com (2603:1096:4:68::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3195.18 via Frontend Transport; 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Signed-off-by: Joakim Zhang --- drivers/irqchip/irq-imx-intmux.c | 59 ++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/drivers/irqchip/irq-imx-intmux.c b/drivers/irqchip/irq-imx-intmux.c index c27577c81126..6095f76c4f0d 100644 --- a/drivers/irqchip/irq-imx-intmux.c +++ b/drivers/irqchip/irq-imx-intmux.c @@ -70,6 +70,9 @@ struct intmux_data { void __iomem *regs; struct clk *ipg_clk; int channum; +#ifdef CONFIG_PM + unsigned int *saved_reg; +#endif struct intmux_irqchip_data irqchip_data[]; }; @@ -232,6 +235,15 @@ static int imx_intmux_probe(struct platform_device *pdev) data->channum = channum; raw_spin_lock_init(&data->lock); + if (IS_ENABLED(CONFIG_PM)) { + /* save CHANIER register */ + data->saved_reg = devm_kzalloc(&pdev->dev, + sizeof(unsigned int) * channum, + GFP_KERNEL); + if (!data->saved_reg) + return -ENOMEM; + } + ret = clk_prepare_enable(data->ipg_clk); if (ret) { dev_err(&pdev->dev, "failed to enable ipg clk: %d\n", ret); @@ -293,6 +305,53 @@ static int imx_intmux_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM +static void imx_intmux_save_regs(struct intmux_data *data) +{ + int i; + + for (i = 0; i < data->channum; i++) + data->saved_reg[i] = readl_relaxed(data->regs + CHANIER(i)); +} + +static void imx_intmux_restore_regs(struct intmux_data *data) +{ + int i; + + for (i = 0; i < data->channum; i++) + writel_relaxed(data->saved_reg[i], data->regs + CHANIER(i)); +} + +static int imx_intmux_suspend(struct device *dev) +{ + struct intmux_data *data = dev_get_drvdata(dev); + + imx_intmux_save_regs(data); + clk_disable_unprepare(data->ipg_clk); + + return 0; +} + +static int imx_intmux_resume(struct device *dev) +{ + struct intmux_data *data = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(data->ipg_clk); + if (ret) { + dev_err(dev, "failed to enable ipg clk: %d\n", ret); + return ret; + } + imx_intmux_restore_regs(data); + + return 0; +} +#endif + +static const struct dev_pm_ops imx_intmux_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_intmux_suspend, imx_intmux_resume) +}; + static const struct of_device_id imx_intmux_id[] = { { .compatible = "fsl,imx-intmux", }, { /* sentinel */ }, -- 2.17.1