[PATCH 2/2] pinmux: add a driver for the U300 pinmux

[Barry Song]

> +static int __init u300_pmx_probe(struct platform_device *pdev)
> +{
> +       int ret;
> +       struct u300_pmx *upmx;
> +       struct resource *res;
> +
> +       /* Create state holders etc for this driver */
> +       upmx = devm_kzalloc(&pdev->dev, sizeof(struct u300_pmx), GFP_KERNEL);

and this would be "devm_kzalloc(&pdev->dev, sizeof(*upmx), GFP_KERNEL); " ?

> +       if (!upmx)
> +               return -ENOMEM;
> +
> +       upmx->dev = &pdev->dev;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (!res) {
> +               ret = -ENOENT;
> +               goto out_no_resource;
> +       }
> +       upmx->phybase = res->start;
> +       upmx->physize = resource_size(res);
> +
> +       if (request_mem_region(upmx->phybase, upmx->physize,
> +                              DRIVER_NAME) == NULL) {
> +               ret = -EBUSY;
> +               goto out_no_memregion;
> +       }
> +
> +       upmx->virtbase = ioremap(upmx->phybase, upmx->physize);
> +       if (!upmx->virtbase) {
> +               ret = -ENOMEM;
> +               goto out_no_remap;
> +       }
> +
> +       upmx->pctl = pinctrl_register(&u300_pmx_desc, &pdev->dev, upmx);
> +       if (IS_ERR(upmx->pctl)) {
> +               dev_err(&pdev->dev, "could not register U300 pinmux driver\n");
> +               ret = PTR_ERR(upmx->pctl);
> +               goto out_no_pmx;
> +       }
> +
> +       /* We will handle a range of GPIO pins */
> +       pinctrl_add_gpio_range(upmx->pctl, &u300_gpio_range);
> +
> +       platform_set_drvdata(pdev, upmx);
> +
> +       u300_pmx_dumpregs(upmx);
> +
> +       dev_info(&pdev->dev, "initialized U300 pinmux driver\n");
> +
> +       return 0;
> +
> +out_no_pmx:
> +       iounmap(upmx->virtbase);
> +out_no_remap:
> +       platform_set_drvdata(pdev, NULL);
> +out_no_memregion:
> +       release_mem_region(upmx->phybase, upmx->physize);
> +out_no_resource:
> +       devm_kfree(&pdev->dev, upmx);
> +       return ret;
> +}
> +
-barry