Hello Jonghwa,
Quoting Jonghwa Lee (2012-06-27 03:31:17)
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/max77686.h>
> +#include <linux/mfd/max77686-private.h>
> +#include <linux/clk-private.h>
Please use clk-provider.h. I don't see any reason for this code to need
clk-private.h.
> +#include <linux/mutex.h>
> +#include <linux/clkdev.h>
> +
> +#define MAX77686_CLKS_NUM 3
> +
> +struct clk_max77686 {
> + struct max77686_dev *iodev;
> + u32 mask;
> + struct clk_hw hw;
> + struct clk_lookup *lookup;
> +};
> +
> +static struct clk_max77686 *get_max77686_clk(struct clk_hw *hw)
> +{
> + return container_of(hw, struct clk_max77686, hw);
> +}
> +
> +static int max77686_clk_enable(struct clk_hw *hw)
Please rename this function to max77686_clk_prepare to reflect that is
is the .prepare callback.
> +{
> + struct clk_max77686 *max77686;
> + int ret;
> +
> + max77686 = get_max77686_clk(hw);
> + if (!max77686)
> + return -ENOMEM;
> +
> + ret = regmap_update_bits(max77686->iodev->regmap,
> + MAX77686_REG_32KHZ, max77686->mask, max77686->mask);
> +
> + return ret;
> +}
> +
> +static void max77686_clk_disable(struct clk_hw *hw)
Please rename this function to max77686_clk_unprepare to reflect that is
is the .unprepare callback.
> +{
> + struct clk_max77686 *max77686;
> +
> + max77686 = get_max77686_clk(hw);
> + if (!max77686)
> + return;
> +
> + regmap_update_bits(max77686->iodev->regmap,
> + MAX77686_REG_32KHZ, max77686->mask, ~max77686->mask);
> +}
> +
> +static int max77686_clk_is_enabled(struct clk_hw *hw)
> +{
> + struct clk_max77686 *max77686;
> + int ret;
> + u32 val;
> +
> + max77686 = get_max77686_clk(hw);
> + if (!max77686)
> + return -ENOMEM;
> +
> + ret = regmap_read(max77686->iodev->regmap,
> + MAX77686_REG_32KHZ, &val);
> +
> + if (ret < 0)
> + return -EINVAL;
> +
> + return val & max77686->mask;
> +}
> +
> +static struct clk_ops clk_max77686_ops = {
> + .prepare = max77686_clk_enable,
> + .unprepare = max77686_clk_disable,
> + .is_enabled = max77686_clk_is_enabled,
> +};
> +
> +static int max77686_clk_register(struct device *dev,
> + struct clk_max77686 *max77686, int clk_id)
> +{
> + char clk_name[][10] = {"32khap", "32kcp", "p32kh"};
const?
> + struct clk *clk;
> +
> + clk = clk_register(dev, clk_name[clk_id], &clk_max77686_ops,
> + &max77686->hw, NULL, 0, CLK_IS_ROOT);
> +
> + if (IS_ERR(clk))
> + return -ENOMEM;
> +
> + max77686->lookup = devm_kzalloc(dev, sizeof(struct clk_lookup),
> + GFP_KERNEL);
> + if (IS_ERR(max77686->lookup))
> + return -ENOMEM;
> +
> + max77686->lookup->con_id = clk_name[clk_id];
> + max77686->lookup->clk = clk;
> +
> + clkdev_add(max77686->lookup);
> +
> + return 0;
> +}
> +
> +static __devinit int max77686_clk_probe(struct platform_device *pdev)
> +{
> + struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> + struct clk_max77686 *max77686[MAX77686_CLKS_NUM];
> + int i, ret;
> +
> + for (i = 0; i < MAX77686_CLKS_NUM; i++) {
> + max77686[i] = devm_kzalloc(&pdev->dev,
> + sizeof(struct clk_max77686), GFP_KERNEL);
> + if (!max77686[i])
> + return -ENOMEM;
> +
> + max77686[i]->iodev = iodev;
> + max77686[i]->mask = 1 << i;
> +
> + ret = max77686_clk_register(&pdev->dev, max77686[i], i);
> + if (ret) {
> + dev_err(&pdev->dev, "Fail to register clock\n");
> + return ret;
> + }
There is a memory leak if you successfully register any clocks and then
fail to register the others. Be sure to unwind the loop and kfree those
clocks in such a case (since this appears fatal).
You only have three clocks, so I think the loop could be completely
replaced with an array and three calls to clk_register and clkdev_add
(each).
Regards,
Mike
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