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Date: Thu, 13 Dec 2018 10:01:05 +0100
From: Jerome Brunet <jbrunet@...libre.com>
To: Jianxin Pan <jianxin.pan@...ogic.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 Thu, 2018-12-13 at 12:55 +0800, Jianxin Pan wrote:
> 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.
No! There is no reason to create a specific configuration for this.
please put it under COMMON_CLK_AMLOGIC
> [...]>> +#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.
Same, clkc.h will do
> 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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