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SubjectRe: [PATCH v5 04/12] clk: actions: Add common clock driver support
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Quoting Manivannan Sadhasivam (2018-03-17 03:09:44)
> diff --git a/drivers/clk/actions/owl-common.c b/drivers/clk/actions/owl-common.c
> new file mode 100644
> index 000000000000..a7cb698fdc86
> --- /dev/null
> +++ b/drivers/clk/actions/owl-common.c
> @@ -0,0 +1,84 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +//
> +// OWL common clock driver
> +//
> +// Copyright (c) 2014 Actions Semi Inc.
> +// Author: David Liu <liuwei@actions-semi.com>
> +//
> +// Copyright (c) 2018 Linaro Ltd.
> +// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> +
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/regmap.h>
> +
> +#include "owl-common.h"
> +
> +static const struct regmap_config owl_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> + .max_register = 0xffff,

Is that actually the end?

> + .fast_io = true,
> +};
> +
> +static void owl_clk_set_regmap(const struct owl_clk_desc *desc,
> + struct regmap *regmap)
> +{
> + int i;
> + struct owl_clk_common *clks;
> +
> + for (i = 0; i < desc->num_clks; i++) {
> + clks = desc->clks[i];
> + if (!clks)
> + continue;
> +
> + clks->regmap = regmap;
> + }
> +}
> +
> +int owl_clk_regmap_init(struct platform_device *pdev,
> + const struct owl_clk_desc *desc)
> +{
> + void __iomem *base;
> + struct device_node *node = pdev->dev.of_node;
> + struct regmap *regmap;
> +
> + base = of_iomap(node, 0);

Please use platform device apis to find and map the ioresources.

> + regmap = devm_regmap_init_mmio(&pdev->dev, base, &owl_regmap_config);
> + if (IS_ERR_OR_NULL(regmap)) {

Isn't it just IS_ERR() for regmap errors?

> + pr_err("failed to init regmap\n");
> + return PTR_ERR(regmap);
> + }
> +
> + owl_clk_set_regmap(desc, regmap);
> +
> + return 0;
> +}
> +
> +int owl_clk_probe(struct device *dev, struct clk_hw_onecell_data *hw_clks)
> +{
> + int i, ret;
> + struct clk_hw *hw;
> +
> + for (i = 0; i < hw_clks->num; i++) {
> +
> + hw = hw_clks->hws[i];
> +
> + if (!hw)

Style: Stick that if to the assignment before.

> + continue;
> +
> + ret = devm_clk_hw_register(dev, hw);
> + if (ret) {
> + dev_err(dev, "Couldn't register clock %d - %s\n",
> + i, hw->init->name);
> + return ret;
> + }
> + }
> +
> + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_clks);
> + if (ret)
> + dev_err(dev, "Failed to add clock provider\n");
> +
> + return ret;
> +}

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