Hi,
On Sun, Mar 22, 2015 at 12:29:58AM +0000, Stefan Wahren wrote:
> This patch adds a minimal driver for the Freescale i.MX23, i.MX28
> power subsystem. It's required to trigger the probing of the underlying
> drivers like on-chip regulators.
>
> [...]
>
> +config MXS_POWER
> + tristate "Freescale MXS power subsystem support"
> + depends on ARCH_MXS
please add "|| COMPILE_TEST"
> + help
> + Say Y here to enable support for the Freescale i.MX23/i.MX28
> + power subsystem. This is a requirement to get access to on-chip
> + regulators, battery charger and many more.
>
> [...]
>
> +static int mxs_power_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct resource *res;
> + struct mxs_power_data *data;
> + struct power_supply_config psy_cfg = {};
> + void __iomem *v5ctrl_addr;
> +
> + if (!np) {
> + dev_err(dev, "missing device tree\n");
> + return -EINVAL;
> + }
> +
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + data->base_addr = devm_ioremap_resource(dev, res);
> + if (IS_ERR(data->base_addr))
> + return PTR_ERR(data->base_addr);
> +
> + psy_cfg.drv_data = data;
> +
> + data->ac = power_supply_register(dev, &ac_desc, &psy_cfg);
> + if (IS_ERR(data->ac))
> + return PTR_ERR(data->ac);
You can use devm_power_supply_register to simplify the driver
a bit more.
> + platform_set_drvdata(pdev, data);
> +
> + v5ctrl_addr = data->base_addr + HW_POWER_5VCTRL_OFFSET;
> +
> + /* Make sure the current limit of the linregs are disabled. */
> + writel(BM_POWER_5VCTRL_ENABLE_LINREG_ILIMIT,
> + v5ctrl_addr + HW_POWER_CTRL_CLR);
> +
> + return of_platform_populate(np, NULL, NULL, dev);
> +}
> +
> [...]
-- Sebastian
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