Re: [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver

[Stephen Boyd]

Quoting Jianxin Pan (2018-12-17 08:24:10)
> diff --git a/drivers/clk/meson/mmc-clkc.c b/drivers/clk/meson/mmc-clkc.c
> new file mode 100644
> index 0000000..2582a98
> --- /dev/null
> +++ b/drivers/clk/meson/mmc-clkc.c
> @@ -0,0 +1,304 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Amlogic Meson MMC Sub Clock Controller Driver
> + *
> + * Copyright (c) 2017 Baylibre SAS.
> + * Author: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
> + *
> + * Copyright (c) 2018 Amlogic, inc.
> + * Author: Yixun Lan <yixun.lan@xxxxxxxxxxx>
> + * Author: Jianxin Pan <jianxin.pan@xxxxxxxxxxx>
> + */
> +
> +#include <linux/clk.h>

Do you need this include?

> +#include <linux/clk-provider.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/of_device.h>
> +#include <linux/mfd/syscon.h>

Is this used?

> +#include <linux/platform_device.h>
[...]
> +       init.num_parents = 1;
> +
> +       clk = mmc_clkc_register_clk(dev, map, &init, suffix, data);
> +       if (IS_ERR(clk))
> +               dev_err(dev, "%s clock registration failed\n", suffix);
> +
> +       return clk;
> +}
> +
> +static int mmc_clkc_probe(struct platform_device *pdev)
> +{
> +       struct clk_hw_onecell_data *onecell_data;
> +       struct device *dev = &pdev->dev;
> +       struct mmc_clkc_data *data;
> +       struct regmap *map;
> +       struct clk_regmap *clk, *core;
> +       struct meson_sclk_div_data *div_data;
> +
> +       /*cast to drop the const in match->data*/
> +       data = (struct mmc_clkc_data *)of_device_get_match_data(dev);

Is that necessary? Maybe the users of this should take a const argument
and copy things?

> +       if (!data)
> +               return -ENODEV;
> +
> +       map = syscon_node_to_regmap(dev->of_node);
> +       if (IS_ERR(map)) {
> +               dev_err(dev, "could not find mmc clock controller\n");
> +               return PTR_ERR(map);
> +       }
> +
> +       onecell_data = devm_kzalloc(dev, sizeof(*onecell_data) +
> +                                   sizeof(*onecell_data->hws) * MMC_MAX_CLKS,

struct_size()?