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Message-ID: <11bb5068-2c93-a415-b295-6ca994621280@amlogic.com>
Date: Thu, 13 Dec 2018 12:55:25 +0800
From: Jianxin Pan <jianxin.pan@...ogic.com>
To: 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>,
Stephen Boyd <sboyd@...nel.org>, 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 RESEND v7 3/4] clk: meson: add sub MMC clock controller
driver
On 2018/12/12 0:59, Jerome Brunet wrote:
> On Tue, 2018-12-11 at 00:04 +0800, Jianxin Pan wrote:
>> From: Yixun Lan <yixun.lan@...ogic.com>
>>
[...]
>>
>> +config COMMON_CLK_MMC_MESON
>> + tristate "Meson MMC Sub Clock Controller Driver"
>> + select MFD_SYSCON
>> + select COMMON_CLK_AMLOGIC
>> + select COMMON_CLK_AMLOGIC_AUDIO
>
> No it is wrong for the mmc to select AUDIO clocks.
> If as a result of your patch sclk is needed for things, make the necessary
> change in the Makefile.
OK, I will add COMMON_CLK_AMLOGIC_SCLKDIV for sclk-div.
>
[...]>> +#include <linux/clk.h>
>> +#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>
>> +#include <linux/platform_device.h>
>> +#include <dt-bindings/clock/amlogic,mmc-clkc.h>
>> +
>> +#include "clkc.h"
>> +#include "clkc-audio.h"
>
> Again having audio in the mmc controller is wrong.
> Please make the necessary rework.
Yes, I will split out sclk-div.h from clkc-audio.h in the next version.
Thanks for your time.
>
>> +
>> +/* clock ID used by internal driver */
>> +#define CLKID_MMC_MUX 0
>> +
>> +#define SD_EMMC_CLOCK 0
> ^
> why the multiple space here ? this looks odd
I will check the alignement in the whole patchset and fix them, Thank you.
>
>> +#define CLK_DELAY_STEP_PS 200
>
> Please keep thing aligned aligned consistently.
>
>> +
>> +#define MUX_CLK_NUM_PARENTS 2
>> +#define MMC_MAX_CLKS 5
>> +
>> +struct mmc_clkc_data {
>> + struct meson_clk_phase_delay_data tx;
>> + struct meson_clk_phase_delay_data rx;
>
> Why use a tab above ?
OK
>
>> +};
>> +
>> +static struct clk_regmap_mux_data mmc_clkc_mux_data = {
>> + .offset = SD_EMMC_CLOCK,
>> + .mask = 0x3,
>> + .shift = 6,
>> +};
>> +
>> +static const struct meson_sclk_div_data mmc_clkc_div_data = {
>> + .div = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = (0),
>> + .width = (6),
>
> Please remove the unncessary parenthesis
OK, I will remove them.
>
>> + },
>> + .hi = {
>> + .width = 0,
>> + },
>
> structure is a static const, all non-list members will be zero
> drop the
OK, I will remove it in the next version.
>
>> + .flags = CLK_DIVIDER_ONE_BASED,
>> +};
>> +
>> +static struct meson_clk_phase_data mmc_clkc_core_phase = {
>> + .ph = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 8,
>> + .width = 2,
>> + }
>> +};
>> +
>> +static const struct mmc_clkc_data mmc_clkc_gx_data = {
>> + .tx = {
>> + .phase = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 10,
>> + .width = 2,
>> + },
>> + .delay = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 16,
>> + .width = 4,
>> + },
>
> Again, an effort on alignement would appreciated, same below
OK, I will fix them.
>
>> + .delay_step_ps = CLK_DELAY_STEP_PS,
>> + },
>> + .rx = {
>> + .phase = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 12,
>> + .width = 2,
>> + },
>> + .delay = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 20,
>> + .width = 4,
>> + },
>> + .delay_step_ps = CLK_DELAY_STEP_PS,
>> + },
>> +};
>> +
>> +static const struct mmc_clkc_data mmc_clkc_axg_data = {
>> + .tx = {
>> + .phase = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 10,
>> + .width = 2,
>> + },
>> + .delay = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 16,
>> + .width = 6,
>> + },
>> + .delay_step_ps = CLK_DELAY_STEP_PS,
>> + },
>> + .rx = {
>> + .phase = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 12,
>> + .width = 2,
>> + },
>> + .delay = {
>> + .reg_off = SD_EMMC_CLOCK,
>> + .shift = 22,
>> + .width = 6,
>> + },
>> + .delay_step_ps = CLK_DELAY_STEP_PS,
>> + },
>> +};
>> +
>> +static const struct of_device_id mmc_clkc_match_table[] = {
>> + {
>> + .compatible = "amlogic,gx-mmc-clkc",
>> + .data = &mmc_clkc_gx_data
>> + },
>> + {
>> + .compatible = "amlogic,axg-mmc-clkc",
>> + .data = &mmc_clkc_axg_data
>> + },
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(of, mmc_clkc_match_table);
>> +
>> +static struct clk_regmap *
>> +mmc_clkc_register_clk(struct device *dev, struct regmap *map,
>> + struct clk_init_data *init,
>> + const char *suffix, void *data)
>> +{
>> + struct clk_regmap *clk;
>> + char *name;
>> + int ret;
>> +
>> + clk = devm_kzalloc(dev, sizeof(*clk), GFP_KERNEL);
>> + if (!clk)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + name = kasprintf(GFP_KERNEL, "%s#%s", dev_name(dev), suffix);
>> + if (!name)
>> + return ERR_PTR(-ENOMEM);
>> +
>> + init->name = name;
>> +
>
> nitpick: remove this newline
OK.
>
>> + clk->map = map;
>> + clk->data = data;
>> + clk->hw.init = init;
>> +
>> + ret = devm_clk_hw_register(dev, &clk->hw);
>> + if (ret)
>> + clk = ERR_PTR(ret);
>> +
>> + kfree(name);
>> + return clk;
>> +}
>> +
>> +static struct clk_regmap *mmc_clkc_register_mux(struct device *dev,
>> + struct regmap *map)
>> +{
>> + const char *parent_names[MUX_CLK_NUM_PARENTS];
>> + struct clk_init_data init;
>> + struct clk_regmap *mux;
>> + struct clk *clk;
>> + int i;
>> +
>> + for (i = 0; i < MUX_CLK_NUM_PARENTS; i++) {
>> + char name[8];
>> +
>> + snprintf(name, sizeof(name), "clkin%d", i);
>> + clk = devm_clk_get(dev, name);
>> + if (IS_ERR(clk)) {
>> + if (clk != ERR_PTR(-EPROBE_DEFER))
>> + dev_err(dev, "Missing clock %s\n", name);
>> + return ERR_PTR((long)clk);
>
> I don't think this cast is necessary ^
Yes, return clk is ok here.
>
>> + }
>> +
>> + parent_names[i] = __clk_get_name(clk);
>> + }
>> +
>> + init.ops = &clk_regmap_mux_ops;
>> + init.flags = CLK_SET_RATE_PARENT;
>> + init.parent_names = parent_names;
>> + init.num_parents = MUX_CLK_NUM_PARENTS;
>> +
>> + mux = mmc_clkc_register_clk(dev, map, &init, "mux",
>> &mmc_clkc_mux_data);
>> + if (IS_ERR(mux))
>> + dev_err(dev, "Mux clock registration failed\n");
>> +
>> + return mux;
>> +}
>> +
>> +static struct clk_regmap *
>> +mmc_clkc_register_clk_with_parent(struct device *dev, struct regmap *map,
>> + char *suffix, const struct clk_hw *hw,
>> + unsigned long flags,
>> + const struct clk_ops *ops, void *data)
>> +{
>> + struct clk_init_data init;
>> + struct clk_regmap *clk;
>> + const char *parent_name = clk_hw_get_name(hw);
>> +
>> + init.ops = ops;
>> + init.flags = flags;
>> + init.parent_names = &parent_name;
>> + init.num_parents = 1;
>> +
>> + clk = mmc_clkc_register_clk(dev, map, &init, suffix, data);
>> + if (IS_ERR(clk))
>> + dev_err(dev, "Core %s clock registration failed\n", suffix);
>
> ^
> this function is not only called by the core clock, is it ?
OK, I will drop "Core" in this line.
>
>> +
>> + 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);
>> + 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,
>> + GFP_KERNEL);
>> + if (!onecell_data)
>> + return -ENOMEM;
>> +
>> + clk = mmc_clkc_register_mux(dev, map);
>> + if (IS_ERR(clk))
>> + return PTR_ERR(clk);
>> + onecell_data->hws[CLKID_MMC_MUX] = &clk->hw,
>
> It does not really need to have an ID or be in the onecell data if you are not
> going to expose it. On the other controllers, we are using the onecell for the
> registration as well, which is why there is unexpeosed IDs, but it is not the
> case here.
>
> ... and please, stop with this unnecessary tab. a space will do. same below.
CLKID_MMC_MUX is an internal clock, and I will remove the ID and onecell date in the next version.
And I will double check and fix tabs. Thank you.
>
>> +
>> + div_data = devm_kzalloc(dev, sizeof(*div_data), GFP_KERNEL);
>> + if (!div_data)
>> + return -ENOMEM;
>> + *div_data = mmc_clkc_div_data;
>
> memcpy would be more appropriate.
Sure.
>
>> +
>> + clk = mmc_clkc_register_clk_with_parent(dev, map, "div",
>> + &clk->hw,
[...]
>
>
> .
>
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