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Message-ID:
<IA1PR20MB4953835A7C72DB5DEFA1640FBB262@IA1PR20MB4953.namprd20.prod.outlook.com>
Date: Sat, 9 Mar 2024 16:29:02 +0800
From: Inochi Amaoto <inochiama@...look.com>
To: Stephen Boyd <sboyd@...nel.org>, Albert Ou <aou@...s.berkeley.edu>,
Chao Wei <chao.wei@...hgo.com>, Chen Wang <unicorn_wang@...look.com>,
Conor Dooley <conor+dt@...nel.org>, Inochi Amaoto <inochiama@...look.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Michael Turquette <mturquette@...libre.com>,
Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>,
Rob Herring <robh+dt@...nel.org>
Cc: Jisheng Zhang <jszhang@...nel.org>, Liu Gui <kenneth.liu@...hgo.com>,
Jingbao Qiu <qiujingbao.dlmu@...il.com>, dlan@...too.org, linux-clk@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v8 2/8] clk: sophgo: Add CV1800/SG2000 series clock
controller driver skeleton
On Fri, Mar 08, 2024 at 09:21:34PM -0800, Stephen Boyd wrote:
> Quoting Inochi Amaoto (2024-02-13 00:22:34)
> > diff --git a/drivers/clk/sophgo/Kconfig b/drivers/clk/sophgo/Kconfig
> > new file mode 100644
> > index 000000000000..d67009fa749f
> > --- /dev/null
> > +++ b/drivers/clk/sophgo/Kconfig
> > @@ -0,0 +1,12 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +# common clock support for SOPHGO SoC family.
> > +
> > +config CLK_SOPHGO_CV1800
> > + tristate "Support for the Sophgo CV1800 series SoCs clock controller"
> > + default m
>
> Please remove any default and set it in the defconfig instead.
>
> > + depends on ARCH_SOPHGO || COMPILE_TEST
> > + help
> > + This driver supports clock controller of Sophgo CV18XX series SoC.
> > + The driver require a 25MHz Oscillator to function generate clock.
> > + It includes PLLs, common clock function and some vendor clock for
> > + IPs of CV18XX series SoC
> > diff --git a/drivers/clk/sophgo/clk-cv1800.c b/drivers/clk/sophgo/clk-cv1800.c
> > new file mode 100644
> > index 000000000000..7183e67f20bf
> > --- /dev/null
> > +++ b/drivers/clk/sophgo/clk-cv1800.c
> > @@ -0,0 +1,113 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2023 Inochi Amaoto <inochiama@...look.com>
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/clk-provider.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/io.h>
> > +#include <linux/spinlock.h>
> > +
> > +#include "clk-cv18xx-common.h"
> > +
> > +struct cv1800_clk_ctrl;
> > +
> > +struct cv1800_clk_desc {
> > + struct clk_hw_onecell_data *clks_data;
> > +
> > + int (*pre_init)(struct device *dev, void __iomem *base,
> > + struct cv1800_clk_ctrl *ctrl,
> > + const struct cv1800_clk_desc *desc);
> > +};
> > +
> > +struct cv1800_clk_ctrl {
> > + const struct cv1800_clk_desc *desc;
> > + spinlock_t lock;
> > +};
> > +
> > +static int cv1800_clk_init_ctrl(struct device *dev, void __iomem *reg,
> > + struct cv1800_clk_ctrl *ctrl,
> > + const struct cv1800_clk_desc *desc)
> > +{
> > + int i, ret;
> > +
> > + ctrl->desc = desc;
> > + spin_lock_init(&ctrl->lock);
> > +
> > + for (i = 0; i < desc->clks_data->num; i++) {
> > + struct clk_hw *hw = desc->clks_data->hws[i];
> > + struct cv1800_clk_common *common;
> > + const char *name;
> > +
> > + if (!hw)
> > + continue;
> > +
> > + name = hw->init->name;
> > +
> > + common = hw_to_cv1800_clk_common(hw);
> > + common->base = reg;
> > + common->lock = &ctrl->lock;
> > +
> > + ret = devm_clk_hw_register(dev, hw);
> > + if (ret) {
> > + dev_err(dev, "Couldn't register clock %d - %s\n",
> > + i, name);
> > + return ret;
> > + }
> > + }
> > +
> > + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
> > + desc->clks_data);
> > +
> > + return ret;
>
> Just return devm...
>
> > +}
> > +
> > +static int cv1800_clk_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + void __iomem *reg;
> > + int ret;
> > + const struct cv1800_clk_desc *desc;
> > + struct cv1800_clk_ctrl *ctrl;
> > +
> > + reg = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(reg))
> > + return PTR_ERR(reg);
> > +
> > + desc = device_get_match_data(dev);
> > + if (!desc) {
> > + dev_err(dev, "no match data for platform\n");
> > + return -EINVAL;
> > + }
> > +
> > + ctrl = devm_kmalloc(dev, sizeof(*ctrl), GFP_KERNEL);
>
> Why not devm_kzalloc?
>
> > + if (!ctrl)
> > + return -ENOMEM;
> > +
> > + if (desc->pre_init) {
> > + ret = desc->pre_init(dev, reg, ctrl, desc);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + ret = cv1800_clk_init_ctrl(dev, reg, ctrl, desc);
> > +
> > + return ret;
>
> This is return cv1800_clk_init_ctrl(...
>
> > +}
> > +
> > +static const struct of_device_id cv1800_clk_ids[] = {
> > + { }
>
> Don't do this. Just send the whole driver as one patch.
>
Thanks, I will squash the folling two patch with this.
> > +};
> > +MODULE_DEVICE_TABLE(of, cv1800_clk_ids);
> > +
> > +static struct platform_driver cv1800_clk_driver = {
> > + .probe = cv1800_clk_probe,
> > + .driver = {
> > + .name = "cv1800-clk",
> > + .suppress_bind_attrs = true,
> > + .of_match_table = cv1800_clk_ids,
> > + },
> > +};
> > +module_platform_driver(cv1800_clk_driver);
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/clk/sophgo/clk-cv18xx-common.c b/drivers/clk/sophgo/clk-cv18xx-common.c
> > new file mode 100644
> > index 000000000000..cbcdd88f0e23
> > --- /dev/null
> > +++ b/drivers/clk/sophgo/clk-cv18xx-common.c
> > @@ -0,0 +1,66 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2023 Inochi Amaoto <inochiama@...look.com>
> > + */
> > +
> > +#include <linux/io.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/spinlock.h>
> > +#include <linux/bug.h>
> > +
> > +#include "clk-cv18xx-common.h"
> > +
> > +int cv1800_clk_setbit(struct cv1800_clk_common *common,
> > + struct cv1800_clk_regbit *field)
> > +{
> > + u32 mask = BIT(field->shift);
> > + u32 value;
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(common->lock, flags);
> > +
> > + value = readl(common->base + field->reg);
> > + writel(value | mask, common->base + field->reg);
> > +
> > + spin_unlock_irqrestore(common->lock, flags);
> > +
> > + return 0;
> > +}
> > +
> > +int cv1800_clk_clearbit(struct cv1800_clk_common *common,
> > + struct cv1800_clk_regbit *field)
> > +{
> > + u32 mask = BIT(field->shift);
> > + u32 value;
> > + unsigned long flags;
> > +
> > + spin_lock_irqsave(common->lock, flags);
> > +
> > + value = readl(common->base + field->reg);
> > + writel(value & ~mask, common->base + field->reg);
> > +
> > + spin_unlock_irqrestore(common->lock, flags);
> > +
> > + return 0;
> > +}
> > +
> > +int cv1800_clk_checkbit(struct cv1800_clk_common *common,
> > + struct cv1800_clk_regbit *field)
> > +{
> > + return readl(common->base + field->reg) & BIT(field->shift);
> > +}
> > +
> > +#define PLL_LOCK_TIMEOUT_US (200 * 1000)
> > +
> > +void cv1800_clk_wait_for_lock(struct cv1800_clk_common *common,
> > + u32 reg, u32 lock)
> > +{
> > + void __iomem *addr = common->base + reg;
> > + u32 regval;
> > +
> > + if (!lock)
> > + return;
> > +
> > + WARN_ON(readl_relaxed_poll_timeout(addr, regval, regval & lock,
> > + 100, PLL_LOCK_TIMEOUT_US));
> > +}
> > diff --git a/drivers/clk/sophgo/clk-cv18xx-common.h b/drivers/clk/sophgo/clk-cv18xx-common.h
> > new file mode 100644
> > index 000000000000..2bfda02b2064
> > --- /dev/null
> > +++ b/drivers/clk/sophgo/clk-cv18xx-common.h
> > @@ -0,0 +1,81 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (C) 2023 Inochi Amaoto <inochiama@...look.com>
> > + */
> > +
> > +#ifndef _CLK_SOPHGO_CV18XX_IP_H_
> > +#define _CLK_SOPHGO_CV18XX_IP_H_
> > +
> > +#include <linux/compiler.h>
> > +#include <linux/clk-provider.h>
> > +#include <linux/bitfield.h>
> > +
> > +struct cv1800_clk_common {
> > + void __iomem *base;
> > + spinlock_t *lock;
> > + struct clk_hw hw;
> > + unsigned long features;
> > +};
> > +
> > +#define CV1800_CLK_COMMON(_name, _parents, _op, _flags) \
> > + { \
> > + .hw.init = CLK_HW_INIT_PARENTS_DATA(_name, _parents, \
> > + _op, _flags), \
> > + }
> > +
> > +static inline struct cv1800_clk_common *
> > +hw_to_cv1800_clk_common(struct clk_hw *hw)
> > +{
> > + return container_of(hw, struct cv1800_clk_common, hw);
> > +}
> > +
> > +struct cv1800_clk_regbit {
> > + u16 reg;
> > + s8 shift;
> > +};
> > +
> > +struct cv1800_clk_regfield {
> > + u16 reg;
> > + u8 shift;
> > + u8 width;
> > + s16 initval;
> > + unsigned long flags;
> > +};
> > +
> > +#define CV1800_CLK_BIT(_reg, _shift) \
> > + { \
> > + .reg = _reg, \
> > + .shift = _shift, \
> > + }
> > +
> > +#define CV1800_CLK_REG(_reg, _shift, _width, _initval, _flags) \
> > + { \
> > + .reg = _reg, \
> > + .shift = _shift, \
> > + .width = _width, \
> > + .initval = _initval, \
> > + .flags = _flags, \
> > + }
> > +
> > +#define cv1800_clk_regfield_genmask(_reg) \
> > + GENMASK((_reg)->shift + (_reg)->width - 1, (_reg)->shift)
> > +#define cv1800_clk_regfield_get(_val, _reg) \
> > + (((_val) >> (_reg)->shift) & GENMASK((_reg)->width - 1, 0))
> > +#define cv1800_clk_regfield_set(_val, _new, _reg) \
> > + (((_val) & ~cv1800_clk_regfield_genmask((_reg))) | \
> > + (((_new) & GENMASK((_reg)->width - 1, 0)) << (_reg)->shift))
> > +
> > +#define _CV1800_SET_FIELD(_reg, _val, _field) \
> > + (((_reg) & ~(_field)) | FIELD_PREP((_field), (_val)))
> > +
> > +int cv1800_clk_setbit(struct cv1800_clk_common *common,
> > + struct cv1800_clk_regbit *field);
> > +int cv1800_clk_clearbit(struct cv1800_clk_common *common,
> > + struct cv1800_clk_regbit *field);
> > +int cv1800_clk_checkbit(struct cv1800_clk_common *common,
> > + struct cv1800_clk_regbit *field);
> > +
> > +void cv1800_clk_wait_for_lock(struct cv1800_clk_common *common,
> > + u32 reg, u32 lock);
> > +
> > +#endif // _CLK_SOPHGO_CV18XX_IP_H_
> > diff --git a/drivers/clk/sophgo/clk-cv18xx-ip.c b/drivers/clk/sophgo/clk-cv18xx-ip.c
> > new file mode 100644
> > index 000000000000..cd397d102442
> > --- /dev/null
> > +++ b/drivers/clk/sophgo/clk-cv18xx-ip.c
> > @@ -0,0 +1,98 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2023 Inochi Amaoto <inochiama@...look.com>
> > + */
> > +
> > +#include <linux/clk-provider.h>
> > +#include <linux/io.h>
> > +#include <linux/gcd.h>
> > +#include <linux/spinlock.h>
> > +
> > +#include "clk-cv18xx-ip.h"
> > +
> > +/* GATE */
> > +const struct clk_ops cv1800_clk_gate_ops = {
> > + .disable = NULL,
> > + .enable = NULL,
> > + .is_enabled = NULL,
> > +
> > + .recalc_rate = NULL,
> > + .round_rate = NULL,
> > + .set_rate = NULL,
> > +};
>
> Everything is NULL. What are you trying to do? Point out what will come
> later? Please squash patches.
>
> > +
> > +/* DIV */
> > +const struct clk_ops cv1800_clk_div_ops = {
> > + .disable = NULL,
> > + .enable = NULL,
> > + .is_enabled = NULL,
> > +
> > + .determine_rate = NULL,
> > + .recalc_rate = NULL,
> > + .set_rate = NULL,
> > +};
> > +
> > +const struct clk_ops cv1800_clk_bypass_div_ops = {
> > + .disable = NULL,
> > + .enable = NULL,
> > + .is_enabled = NULL,
> > +
> > + .determine_rate = NULL,
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