On Fri, May 22, 2015 at 10:36:34PM +0800, Frank.Li@xxxxxxxxxxxxx wrote: > static int snvs_rtc_probe(struct platform_device *pdev) > { > struct snvs_rtc_data *data; > struct resource *res; > int ret; > + struct device_node *snvs_np; > + void __iomem *mmio; > > data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > if (!data) > return -ENOMEM; > > - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > - data->ioaddr = devm_ioremap_resource(&pdev->dev, res); > - if (IS_ERR(data->ioaddr)) > - return PTR_ERR(data->ioaddr); > + snvs_np = of_get_parent(pdev->dev.of_node); > + if (!snvs_np) > + return -ENODEV; > + > + if (of_device_is_compatible(snvs_np, "syscon")) { > + data->regmap = syscon_node_to_regmap(snvs_np); > + data->offset = 0x34; As I commented on dts patch, we should probably follow syscon-poweroff to have 'regmap' and 'offset' properties. Shawn > + } else { > + pr_warn("snvs rtc: you use old dts file, please update it\n"); > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + > + mmio = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(mmio)) > + return PTR_ERR(mmio); > + > + data->regmap = devm_regmap_init_mmio(&pdev->dev, mmio, &snvs_rtc_config); > + } > + > + of_node_put(snvs_np); > + > + if (!data->regmap) { > + pr_err("Can't snvs syscon\n"); > + return -ENODEV; > + } > > data->irq = platform_get_irq(pdev, 0); > if (data->irq < 0) > @@ -276,13 +282,11 @@ static int snvs_rtc_probe(struct platform_device *pdev) > > platform_set_drvdata(pdev, data); > > - spin_lock_init(&data->lock); > - > /* Initialize glitch detect */ > - writel(SNVS_LPPGDR_INIT, data->ioaddr + SNVS_LPPGDR); > + regmap_write(data->regmap, data->offset + SNVS_LPPGDR, SNVS_LPPGDR_INIT); > > /* Clear interrupt status */ > - writel(0xffffffff, data->ioaddr + SNVS_LPSR); > + regmap_write(data->regmap, data->offset + SNVS_LPSR, 0xffffffff); > > /* Enable RTC */ > snvs_rtc_enable(data, true); > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html