linux-kernel - Re: [PATCH v4 3/4] clk: mediatek: Add new clock driver to handle FHCTL hardware

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Date:   Thu, 13 Oct 2022 14:00:07 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Johnson Wang <johnson.wang@...iatek.com>, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, sboyd@...nel.org
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        kuan-hsin.lee@...iatek.com, yu-chang.wang@...iatek.com,
        Edward-JW Yang <edward-jw.yang@...iatek.com>
Subject: Re: [PATCH v4 3/4] clk: mediatek: Add new clock driver to handle
 FHCTL hardware

Il 13/10/22 13:23, Johnson Wang ha scritto:
> To implement frequency hopping and spread spectrum clocking
> function, we introduce new clock type and APIs to handle
> FHCTL hardware.
> 
> Co-developed-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
> Signed-off-by: Edward-JW Yang <edward-jw.yang@...iatek.com>
> Signed-off-by: Johnson Wang <johnson.wang@...iatek.com>
> ---
>   drivers/clk/mediatek/Kconfig     |   7 +
>   drivers/clk/mediatek/Makefile    |   1 +
>   drivers/clk/mediatek/clk-fhctl.c | 244 ++++++++++++++++++++++++++++
>   drivers/clk/mediatek/clk-fhctl.h |  26 +++
>   drivers/clk/mediatek/clk-pllfh.c | 268 +++++++++++++++++++++++++++++++
>   drivers/clk/mediatek/clk-pllfh.h |  82 ++++++++++
>   6 files changed, 628 insertions(+)
>   create mode 100644 drivers/clk/mediatek/clk-fhctl.c
>   create mode 100644 drivers/clk/mediatek/clk-fhctl.h
>   create mode 100644 drivers/clk/mediatek/clk-pllfh.c
>   create mode 100644 drivers/clk/mediatek/clk-pllfh.h
> 

..snip..

> diff --git a/drivers/clk/mediatek/clk-pllfh.c b/drivers/clk/mediatek/clk-pllfh.c
> new file mode 100644
> index 000000000000..a728ff749db1
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-pllfh.c
> @@ -0,0 +1,268 @@

..snip..

> +
> +int mtk_clk_register_pllfhs(struct device_node *node,
> +			    const struct mtk_pll_data *plls, int num_plls,
> +			    struct mtk_pllfh_data *pllfhs, int num_fhs,
> +			    struct clk_hw_onecell_data *clk_data)
> +{
> +	void __iomem *base;
> +	int i;
> +	struct clk_hw *hw;
> +
> +	base = of_iomap(node, 0);
> +	if (!base) {
> +		pr_err("%s(): ioremap failed\n", __func__);
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < num_plls; i++) {
> +		const struct mtk_pll_data *pll = &plls[i];
> +		struct mtk_pllfh_data *pllfh;

		bool use_fhctl;

		pllfh = get_pllfh_by_id(pllfhs, num_fhs, pll->id);
		use_fhctl = fhctl_is_supported_and_enabled(pllfh);

		if (use_fhctl)
			hw = mtk_clk_register_pllfh(pll, pllfh, base);
		else
			hw = mtk_clk_register_pll(pll, base);

		if (IS_ERR(hw) {
			pr_err("Failed to register %s clk %s: %d\n",
			       use_fhctl ? "fhpll" : "pll", pll->name,
			       PTR_ERR(hw));
			goto err;
		}

.... that's better.
			
> +
> +		clk_data->hws[pll->id] = hw;
> +	}
> +
> +	return 0;
> +
> +err:
> +	while (--i >= 0) {
> +		const struct mtk_pll_data *pll = &plls[i];
> +		struct mtk_pllfh_data *pllfh;
> +
> +		pllfh = get_pllfh_by_id(pllfhs, num_fhs, pll->id);
> +
> +		if (fhctl_is_supported_and_enabled(pllfh))
> +			mtk_clk_unregister_pllfh(clk_data->hws[pll->id]);
> +		else
> +			mtk_clk_unregister_pll(clk_data->hws[pll->id]);
> +
> +		clk_data->hws[pll->id] = ERR_PTR(-ENOENT);
> +	}
> +
> +	iounmap(base);
> +
> +	return PTR_ERR(hw);
> +}
> +

..snip..

> diff --git a/drivers/clk/mediatek/clk-pllfh.h b/drivers/clk/mediatek/clk-pllfh.h
> new file mode 100644
> index 000000000000..effc7976c496
> --- /dev/null
> +++ b/drivers/clk/mediatek/clk-pllfh.h
> @@ -0,0 +1,82 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2022 MediaTek Inc.
> + * Author: Edward-JW Yang <edward-jw.yang@...iatek.com>
> + */
> +
> +#ifndef __DRV_CLKFH_H
> +#define __DRV_CLKFH_H

This should be __CLK_PLLFH_H.

...after which:

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>