On Fri, May 22, 2015 at 10:36:34PM +0800, [email protected] 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
>
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