Hi Arun,
On 31 May 2013 18:33, Arun Kumar K <arun...@samsung.com> wrote:
> This driver is for the FIMC-IS IP available in Samsung Exynos5
> SoC onwards. This patch adds the core files for the new driver.
>
> Signed-off-by: Arun Kumar K <arun...@samsung.com>
> Signed-off-by: Kilyeon Im <kilyeon...@samsung.com>
> ---
[snip]
> +
> +static void fimc_is_clk_put(struct fimc_is *is)
> +{
> + int i;
> +
> + for (i = 0; i < IS_CLK_MAX_NUM; i++) {
> + if (IS_ERR_OR_NULL(is->clock[i]))
You should not check for NULL here. Instead initialize the clocks to
some error value (like "is->clock[i] = ERR_PTR(-EINVAL);" )
and use IS_ERR only.
> + continue;
> + clk_unprepare(is->clock[i]);
> + clk_put(is->clock[i]);
> + is->clock[i] = NULL;
> + }
> +}
> +
> +static int fimc_is_clk_get(struct fimc_is *is)
> +{
> + struct device *dev = &is->pdev->dev;
> + int i, ret;
> +
> + for (i = 0; i < IS_CLK_MAX_NUM; i++) {
> + is->clock[i] = clk_get(dev, fimc_is_clock_name[i]);
> + if (IS_ERR(is->clock[i]))
> + goto err;
> + ret = clk_prepare(is->clock[i]);
> + if (ret < 0) {
> + clk_put(is->clock[i]);
> + is->clock[i] = NULL;
is->clock[i] = ERR_PTR(-EINVAL);
> + goto err;
> + }
> + }
> + return 0;
> +err:
> + fimc_is_clk_put(is);
> + pr_err("Failed to get clock: %s\n", fimc_is_clock_name[i]);
> + return -ENXIO;
> +}
> +
> +static int fimc_is_clk_cfg(struct fimc_is *is)
> +{
> + int ret;
> +
> + ret = fimc_is_clk_get(is);
> + if (ret)
> + return ret;
> +
> + /* Set rates */
> + ret = clk_set_rate(is->clock[IS_CLK_MCU_ISP_DIV0], 200 * 1000000);
> + ret |= clk_set_rate(is->clock[IS_CLK_MCU_ISP_DIV1], 100 * 1000000);
> + ret |= clk_set_rate(is->clock[IS_CLK_ISP_DIV0], 134 * 1000000);
> + ret |= clk_set_rate(is->clock[IS_CLK_ISP_DIV1], 68 * 1000000);
> + ret |= clk_set_rate(is->clock[IS_CLK_ISP_DIVMPWM], 34 * 1000000);
> +
> + if (ret)
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int fimc_is_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource res;
> + struct fimc_is *is;
> + struct pinctrl *pctrl;
> + void __iomem *regs;
> + struct device_node *node;
> + int irq, ret;
> +
> + pr_debug("FIMC-IS Probe Enter\n");
> +
> + if (!pdev->dev.of_node)
> + return -ENODEV;
> +
> + is = devm_kzalloc(&pdev->dev, sizeof(*is), GFP_KERNEL);
> + if (!is)
> + return -ENOMEM;
> +
> + is->pdev = pdev;
> +
> + ret = of_address_to_resource(dev->of_node, 0, &res);
> + if (ret < 0)
> + return ret;
> +
> + regs = devm_ioremap_resource(dev, &res);
> + if (regs == NULL) {
Please use if(IS_ERR(regs))
> + dev_err(dev, "Failed to obtain io memory\n");
This is not needed as devm_ioremap_resource prints the appropriate
error messages.
> + return -ENOENT;
return PTR_ERR(regs);
Don't forget to include <linux/err.h> for using PTR_ERR() .
--
With warm regards,
Sachin
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