linux-kernel - Re: [PATCH 2/2] pinmux: add a driver for the U300 pinmux

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Date:	Sat, 8 Oct 2011 17:12:55 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Stephen Warren <swarren@...dia.com>,
	Lee Jones <lee.jones@...aro.org>,
	Joe Perches <joe@...ches.com>,
	Russell King <linux@....linux.org.uk>,
	Linaro Dev <linaro-dev@...ts.linaro.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	David Brown <davidb@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 2/2] pinmux: add a driver for the U300 pinmux

> +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
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