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Date:   Wed, 29 Nov 2017 11:34:33 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Yixun Lan <yixun.lan@...ogic.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] clk: meson-axg: add clock controller drivers

On 11/28, Yixun Lan wrote:
> diff --git a/drivers/clk/meson/axg.c b/drivers/clk/meson/axg.c
> new file mode 100644
> index 000000000000..51c5b4062715
> --- /dev/null
> +++ b/drivers/clk/meson/axg.c
> @@ -0,0 +1,948 @@
> +/*
> + * AmLogic Meson-AXG Clock Controller Driver
> + *
> + * Copyright (c) 2016 Baylibre SAS.
> + * Author: Michael Turquette <mturquette@...libre.com>
> + *
> + * Copyright (c) 2017 Amlogic, inc.
> + * Author: Qiufang Dai <qiufang.dai@...ogic.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/init.h>
> +
> +#include "clkc.h"
> +#include "axg.h"
> +
> +static DEFINE_SPINLOCK(clk_lock);

meson_axg_clk_lock?

> +
> +static const struct pll_rate_table sys_pll_rate_table[] = {
> +	PLL_RATE(24000000, 56, 1, 2),
> +	PLL_RATE(48000000, 64, 1, 2),
> +	PLL_RATE(72000000, 72, 1, 2),
> +	PLL_RATE(96000000, 64, 1, 2),
> +	PLL_RATE(120000000, 80, 1, 2),
> +	PLL_RATE(144000000, 96, 1, 2),
> +	PLL_RATE(168000000, 56, 1, 1),
> +	PLL_RATE(192000000, 64, 1, 1),
> +	PLL_RATE(216000000, 72, 1, 1),
> +	PLL_RATE(240000000, 80, 1, 1),
[...]
> +
> +static const struct clkc_data axg_clkc_data = {
> +	.clk_gates = axg_clk_gates,
> +	.clk_gates_count = ARRAY_SIZE(axg_clk_gates),
> +	.clk_mplls = axg_clk_mplls,
> +	.clk_mplls_count = ARRAY_SIZE(axg_clk_mplls),
> +	.clk_plls = axg_clk_plls,
> +	.clk_plls_count = ARRAY_SIZE(axg_clk_plls),
> +	.clk_muxes = axg_clk_muxes,
> +	.clk_muxes_count = ARRAY_SIZE(axg_clk_muxes),
> +	.clk_dividers = axg_clk_dividers,
> +	.clk_dividers_count = ARRAY_SIZE(axg_clk_dividers),
> +	.hw_onecell_data = &axg_hw_onecell_data,
> +};
> +
> +static const struct of_device_id clkc_match_table[] = {
> +	{ .compatible = "amlogic,axg-clkc", .data = &axg_clkc_data },
> +	{},

Nitpick: Drop the comma. Nothing comes after this.

> +};
> +
> +static int axg_clkc_probe(struct platform_device *pdev)
> +{
> +	const struct clkc_data *clkc_data;
> +	void __iomem *clk_base;
> +	int ret, clkid, i;
> +	struct device *dev = &pdev->dev;
> +
> +	clkc_data = of_device_get_match_data(&pdev->dev);
> +	if (!clkc_data)
> +		return -EINVAL;
> +
> +	/*  Generic clocks and PLLs */
> +	clk_base = of_iomap(dev->of_node, 0);

Use platform device APIs for ioremapping?

> +	if (!clk_base) {
> +		pr_err("%s: Unable to map clk base\n", __func__);
> +		return -ENXIO;
> +	}
> +
> +	/* Populate base address for PLLs */
> +	for (i = 0; i < clkc_data->clk_plls_count; i++)
> +		clkc_data->clk_plls[i]->base = clk_base;
> +
> +	/* Populate base address for MPLLs */
> +	for (i = 0; i < clkc_data->clk_mplls_count; i++)
> +		clkc_data->clk_mplls[i]->base = clk_base;
> +
> +	/* Populate base address for gates */
> +	for (i = 0; i < clkc_data->clk_gates_count; i++)
> +		clkc_data->clk_gates[i]->reg = clk_base +
> +			(u64)clkc_data->clk_gates[i]->reg;
> +
> +	/* Populate base address for muxes */
> +	for (i = 0; i < clkc_data->clk_muxes_count; i++)
> +		clkc_data->clk_muxes[i]->reg = clk_base +
> +			(u64)clkc_data->clk_muxes[i]->reg;
> +
> +	/* Populate base address for dividers */
> +	for (i = 0; i < clkc_data->clk_dividers_count; i++)
> +		clkc_data->clk_dividers[i]->reg = clk_base +
> +			(u64)clkc_data->clk_dividers[i]->reg;
> +
> +	/*
> +	 * register all clks
> +	 */

Yes, that's obvious..

> +	for (clkid = 0; clkid < clkc_data->hw_onecell_data->num; clkid++) {
> +		/* array might be sparse */
> +		if (!clkc_data->hw_onecell_data->hws[clkid])
> +			continue;
> +
> +		ret = devm_clk_hw_register(dev,
> +					clkc_data->hw_onecell_data->hws[clkid]);
> +		if (ret)
> +			goto iounmap;
> +	}
> +
> +	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
> +			clkc_data->hw_onecell_data);
> +
> +iounmap:
> +	iounmap(clk_base);
> +	return ret;
> +}
> +
> +static struct platform_driver axg_driver = {
> +	.probe		= axg_clkc_probe,
> +	.driver		= {
> +		.name	= "axg-clkc",
> +		.of_match_table = clkc_match_table,
> +	},
> +};
> +
> +builtin_platform_driver(axg_driver);
> diff --git a/include/dt-bindings/clock/axg-clkc.h b/include/dt-bindings/clock/axg-clkc.h
> new file mode 100644
> index 000000000000..d2c0f49ba0df
> --- /dev/null
> +++ b/include/dt-bindings/clock/axg-clkc.h
> @@ -0,0 +1,72 @@
> +/*
> + * Meson-AXG clock tree IDs
> + *
> + * Copyright (c) 2017 Amlogic, Inc. All rights reserved.
> + *
> + * SPDX-License-Identifier: (GPL-2.0+ OR MIT)

There's a standard way to add these it seems. They should be the
first line in the file and look like

/* SPDX-License-Identifier: */

for header files and 

// SPDX-License-Identifier: 

for C files.

-- 
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a Linux Foundation Collaborative Project

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