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

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Date:   Wed, 16 Jan 2019 00:29:51 +0800
From:   Jianxin Pan <jianxin.pan@...ogic.com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>
CC:     Yixun Lan <yixun.lan@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Liang Yang <liang.yang@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Victor Wan <victor.wan@...ogic.com>,
        <linux-clk@...r.kernel.org>, <linux-amlogic@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 4/4] clk: meson: add sub MMC clock controller driver

Hi Stephen,

Thank you for your time.
Please see my comments below.

On 2019/1/10 4:48, Stephen Boyd wrote:
> 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@...libre.com>
>> + *
>> + * Copyright (c) 2018 Amlogic, inc.
>> + * Author: Yixun Lan <yixun.lan@...ogic.com>
>> + * Author: Jianxin Pan <jianxin.pan@...ogic.com>
>> + */
>> +
>> +#include <linux/clk.h>
> 
> Do you need this include?
> 
Yes, It's also a clock-consumer. 
devm_clk_get() gets clock from dts as the parent of mux.
Thank you for your review.
>> +#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?
Yes, syscon_node_to_regmap() is used in mmc_clkc_probe().
> 
>> +#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?
OK, I can alloc two extra memory for PHASE_RX and PHASE_TX data, and then copy from const data to them.
> 
>> +       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()?
> 
OK, I will change it in the next version.
Thank you for your review.
> .
>