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Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller driver

Started by	Stephen Boyd <sboyd@codeaurora.org>
First post	2016-08-13 03:30 +0200
Last post	2016-08-16 19:30 +0200
Articles	3 — 2 participants

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  Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller  driver Stephen Boyd <sboyd@codeaurora.org> - 2016-08-13 03:30 +0200
    Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller  driver Neil Armstrong <narmstrong@baylibre.com> - 2016-08-16 15:40 +0200
      Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller  driver Stephen Boyd <sboyd@codeaurora.org> - 2016-08-16 19:30 +0200

#1461563 — Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller driver

From	Stephen Boyd <sboyd@codeaurora.org>
Date	2016-08-13 03:30 +0200
Subject	Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller driver
Message-ID	<s5vVT-1cn-9@gated-at.bofh.it>

On 08/09, Neil Armstrong wrote:
> diff --git a/drivers/clk/meson/gxbb-aoclk.c b/drivers/clk/meson/gxbb-aoclk.c
> new file mode 100644
> index 0000000..56a9186
> --- /dev/null
> +++ b/drivers/clk/meson/gxbb-aoclk.c
> @@ -0,0 +1,203 @@
> +/*
> + * This file is provided under a dual BSD/GPLv2 license.  When using or
> + * redistributing this file, you may do so under either license.
> + *
> + * GPL LICENSE SUMMARY
> + *
> + * Copyright (c) 2016 BayLibre, SAS.
> + * Author: Neil Armstrong <narmstrong@baylibre.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of version 2 of the GNU General Public License as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + * The full GNU General Public License is included in this distribution
> + * in the file called COPYING.
> + *
> + * BSD LICENSE
> + *
> + * Copyright (c) 2016 BayLibre, SAS.
> + * Author: Neil Armstrong <narmstrong@baylibre.com>
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + *
> + *   * Redistributions of source code must retain the above copyright
> + *     notice, this list of conditions and the following disclaimer.
> + *   * Redistributions in binary form must reproduce the above copyright
> + *     notice, this list of conditions and the following disclaimer in
> + *     the documentation and/or other materials provided with the
> + *     distribution.
> + *   * Neither the name of Intel Corporation nor the names of its
> + *     contributors may be used to endorse or promote products derived
> + *     from this software without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
> + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
> + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
> + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
> + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
> + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
> + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
> + */
> +#include <linux/clk.h>

Is this include used?

> +#include <linux/clk-provider.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset-controller.h>
> +#include <linux/module.h>
> +#include <dt-bindings/clock/gxbb-aoclkc.h>
> +#include <dt-bindings/reset/gxbb-aoclkc.h>
> +
> +static DEFINE_SPINLOCK(clk_lock);

gxbb_clk_lock?

> +
> +struct gxbb_aoclk_reset_controller {
> +	struct reset_controller_dev reset;
> +	unsigned int *data;
> +	void __iomem *base;
> +};
> +
> +static int gxbb_aoclk_do_reset(struct reset_controller_dev *rcdev,
> +			       unsigned long id)
> +{
> +	struct gxbb_aoclk_reset_controller *reset =
> +		container_of(rcdev, struct gxbb_aoclk_reset_controller, reset);
> +
> +	writel(BIT(reset->data[id]), reset->base);
> +
> +	return 0;
> +}
> +
> +static const struct reset_control_ops gxbb_aoclk_reset_ops = {
> +	.reset = gxbb_aoclk_do_reset,
> +};
> +
> +#define GXBB_AO_GATE(_name, _bit)					\
> +static struct clk_gate _name##_ao = {					\
> +	.reg = (void __iomem *)0,					\
> +	.bit_idx = (_bit),						\
> +	.lock = &clk_lock,						\
> +	.hw.init = &(struct clk_init_data) {				\
> +		.name = #_name "_ao",					\
> +		.ops = &clk_gate_ops,					\
> +		.parent_names = (const char *[]){ "clk81" },		\
> +		.num_parents = 1,					\
> +		.flags = (CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED),	\
> +	},								\
> +}
> +
> +GXBB_AO_GATE(remote, 0);
> +GXBB_AO_GATE(i2c_master, 1);
> +GXBB_AO_GATE(i2c_slave, 2);
> +GXBB_AO_GATE(uart1, 3);
> +GXBB_AO_GATE(uart2, 5);
> +GXBB_AO_GATE(ir_blaster, 6);
> +
> +static unsigned int gxbb_aoclk_reset[] = {
> +	[RESET_AO_REMOTE] = 16,
> +	[RESET_AO_I2C_MASTER] = 18,
> +	[RESET_AO_I2C_SLAVE] = 19,
> +	[RESET_AO_UART1] = 17,
> +	[RESET_AO_UART2] = 22,
> +	[RESET_AO_IR_BLASTER] = 23,
> +};
> +
> +static struct clk_gate *gxbb_aoclk_gate[] = {
> +	[CLKID_AO_REMOTE] = &remote_ao,
> +	[CLKID_AO_I2C_MASTER] = &i2c_master_ao,
> +	[CLKID_AO_I2C_SLAVE] = &i2c_slave_ao,
> +	[CLKID_AO_UART1] = &uart1_ao,
> +	[CLKID_AO_UART2] = &uart2_ao,
> +	[CLKID_AO_IR_BLASTER] = &ir_blaster_ao,
> +};
> +
> +static struct clk_hw_onecell_data gxbb_aoclk_onecell_data = {

can this be const?

> +	.hws = {
> +		[CLKID_AO_REMOTE] = &remote_ao.hw,
> +		[CLKID_AO_I2C_MASTER] = &i2c_master_ao.hw,
> +		[CLKID_AO_I2C_SLAVE] = &i2c_slave_ao.hw,
> +		[CLKID_AO_UART1] = &uart1_ao.hw,
> +		[CLKID_AO_UART2] = &uart2_ao.hw,
> +		[CLKID_AO_IR_BLASTER] = &ir_blaster_ao.hw,
> +	},
> +	.num = ARRAY_SIZE(gxbb_aoclk_gate),
> +};
> +
> +static int gxbb_aoclkc_probe(struct platform_device *pdev)
> +{
> +	void __iomem *base;
> +	int ret, clkid;
> +	struct device *dev = &pdev->dev;
> +	struct gxbb_aoclk_reset_controller *rstc;
> +
> +	rstc = devm_kzalloc(dev, sizeof(rstc), GFP_KERNEL);
> +	if (!rstc)
> +		return -ENOMEM;
> +
> +	/*  Generic clocks */
> +	base = of_iomap(dev->of_node, 0);

use devm_ioremap_resource() please and platform APIs to get the
ioresource.

> +	if (!base) {
> +		pr_err("%s: Unable to map clk base\n", __func__);

We don't need error prints here with devm_ioremap_resource().

> +		return -ENXIO;
> +	}
> +
> +	/* Reset Controller */
> +	rstc->base = base;
> +	rstc->data = gxbb_aoclk_reset;
> +	rstc->reset.ops = &gxbb_aoclk_reset_ops;
> +	rstc->reset.nr_resets = ARRAY_SIZE(gxbb_aoclk_reset);
> +	rstc->reset.of_node = dev->of_node;
> +	ret = devm_reset_controller_register(dev, &rstc->reset);
> +
> +	/*
> +	 * Populate base address and register all clks
> +	 */
> +	for (clkid = 0; clkid < gxbb_aoclk_onecell_data.num; clkid++) {
> +		gxbb_aoclk_gate[clkid]->reg = base;
> +
> +		ret = devm_clk_hw_register(dev,
> +					gxbb_aoclk_onecell_data.hws[clkid]);
> +		if (ret)
> +			goto iounmap;
> +	}
> +
> +	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
> +			&gxbb_aoclk_onecell_data);
> +
> +iounmap:
> +	iounmap(base);
> +	return ret;
> +}
> +
> +static const struct of_device_id gxbb_aoclkc_match_table[] = {
> +	{ .compatible = "amlogic,gxbb-aoclkc" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, gxbb_aoclkc_match_table);
> +
> +static struct platform_driver gxbb_aoclkc_driver = {
> +	.probe		= gxbb_aoclkc_probe,

No remove means leak of iomem mapping.
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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#1463789

From	Neil Armstrong <narmstrong@baylibre.com>
Date	2016-08-16 15:40 +0200
Message-ID	<s6MKZ-3GS-5@gated-at.bofh.it>
In reply to	#1461563

Hi Stephen,

On 08/13/2016 03:29 AM, Stephen Boyd wrote:
> On 08/09, Neil Armstrong wrote:
>> diff --git a/drivers/clk/meson/gxbb-aoclk.c b/drivers/clk/meson/gxbb-aoclk.c
>> new file mode 100644
>> index 0000000..56a9186
>> --- /dev/null
>> +++ b/drivers/clk/meson/gxbb-aoclk.c
>> @@ -0,0 +1,203 @@

[...]

>> + */
>> +#include <linux/clk.h>
> 
> Is this include used?

No !

> 
>> +#include <linux/clk-provider.h>
>> +#include <linux/of_address.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/reset-controller.h>
>> +#include <linux/module.h>
>> +#include <dt-bindings/clock/gxbb-aoclkc.h>
>> +#include <dt-bindings/reset/gxbb-aoclkc.h>
>> +
>> +static DEFINE_SPINLOCK(clk_lock);
> 
> gxbb_clk_lock?

Renamed into gxbb_aoclk_lock for sake of clarity

> 
>> +
>> +struct gxbb_aoclk_reset_controller {
>> +	struct reset_controller_dev reset;
>> +	unsigned int *data;
>> +	void __iomem *base;
>> +};
>> +

[...]

>> +
>> +static struct clk_hw_onecell_data gxbb_aoclk_onecell_data = {
> 
> can this be const?

It would be awesome, but it will be discarded by of_clk_add_hw_provider :

drivers/clk/meson/gxbb-aoclk.c:176:4: warning: passing argument 3 of 'of_clk_add_hw_provider' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    &gxbb_aoclk_onecell_data);

In file included from drivers/clk/meson/gxbb-aoclk.c:55:0:
./include/linux/clk-provider.h:788:5: note: expected 'void *' but argument is of type 'const struct clk_hw_onecell_data *'
 int of_clk_add_hw_provider(struct device_node *np,

> 
>> +	.hws = {
>> +		[CLKID_AO_REMOTE] = &remote_ao.hw,
>> +		[CLKID_AO_I2C_MASTER] = &i2c_master_ao.hw,
>> +		[CLKID_AO_I2C_SLAVE] = &i2c_slave_ao.hw,
>> +		[CLKID_AO_UART1] = &uart1_ao.hw,
>> +		[CLKID_AO_UART2] = &uart2_ao.hw,
>> +		[CLKID_AO_IR_BLASTER] = &ir_blaster_ao.hw,
>> +	},
>> +	.num = ARRAY_SIZE(gxbb_aoclk_gate),
>> +};
>> +
>> +static int gxbb_aoclkc_probe(struct platform_device *pdev)
>> +{
>> +	void __iomem *base;
>> +	int ret, clkid;
>> +	struct device *dev = &pdev->dev;
>> +	struct gxbb_aoclk_reset_controller *rstc;
>> +
>> +	rstc = devm_kzalloc(dev, sizeof(rstc), GFP_KERNEL);
>> +	if (!rstc)
>> +		return -ENOMEM;
>> +
>> +	/*  Generic clocks */
>> +	base = of_iomap(dev->of_node, 0);
> 
> use devm_ioremap_resource() please and platform APIs to get the
> ioresource.

Done.

> 
>> +	if (!base) {
>> +		pr_err("%s: Unable to map clk base\n", __func__);
> 
> We don't need error prints here with devm_ioremap_resource().
> 
>> +		return -ENXIO;
>> +	}
>> +
>> +	/* Reset Controller */
>> +	rstc->base = base;
>> +	rstc->data = gxbb_aoclk_reset;
>> +	rstc->reset.ops = &gxbb_aoclk_reset_ops;
>> +	rstc->reset.nr_resets = ARRAY_SIZE(gxbb_aoclk_reset);
>> +	rstc->reset.of_node = dev->of_node;
>> +	ret = devm_reset_controller_register(dev, &rstc->reset);
>> +
>> +	/*
>> +	 * Populate base address and register all clks
>> +	 */
>> +	for (clkid = 0; clkid < gxbb_aoclk_onecell_data.num; clkid++) {
>> +		gxbb_aoclk_gate[clkid]->reg = base;
>> +
>> +		ret = devm_clk_hw_register(dev,
>> +					gxbb_aoclk_onecell_data.hws[clkid]);
>> +		if (ret)
>> +			goto iounmap;
>> +	}
>> +
>> +	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
>> +			&gxbb_aoclk_onecell_data);
>> +
>> +iounmap:
>> +	iounmap(base);
>> +	return ret;
>> +}
>> +
>> +static const struct of_device_id gxbb_aoclkc_match_table[] = {
>> +	{ .compatible = "amlogic,gxbb-aoclkc" },
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, gxbb_aoclkc_match_table);
>> +
>> +static struct platform_driver gxbb_aoclkc_driver = {
>> +	.probe		= gxbb_aoclkc_probe,
> 
> No remove means leak of iomem mapping.
> 

It will be non-modular, so no need of remove. The MODULE_* macros and module.h include will be removed like other clk drivers (gxbb and oxnas for instance).

Thanks,
Neil

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#1463957

From	Stephen Boyd <sboyd@codeaurora.org>
Date	2016-08-16 19:30 +0200
Message-ID	<s6QlA-5Yr-17@gated-at.bofh.it>
In reply to	#1463789

On 08/16, Neil Armstrong wrote:
> On 08/13/2016 03:29 AM, Stephen Boyd wrote:
> > On 08/09, Neil Armstrong wrote:
> 
> >> +
> >> +static struct clk_hw_onecell_data gxbb_aoclk_onecell_data = {
> > 
> > can this be const?
> 
> It would be awesome, but it will be discarded by of_clk_add_hw_provider :

Ok, right.

> >> +iounmap:
> >> +	iounmap(base);
> >> +	return ret;
> >> +}
> >> +
> >> +static const struct of_device_id gxbb_aoclkc_match_table[] = {
> >> +	{ .compatible = "amlogic,gxbb-aoclkc" },
> >> +	{ }
> >> +};
> >> +MODULE_DEVICE_TABLE(of, gxbb_aoclkc_match_table);
> >> +
> >> +static struct platform_driver gxbb_aoclkc_driver = {
> >> +	.probe		= gxbb_aoclkc_probe,
> > 
> > No remove means leak of iomem mapping.

And OF provider registration.

> > 
> 
> It will be non-modular, so no need of remove. The MODULE_* macros and module.h include will be removed like other clk drivers (gxbb and oxnas for instance).

Ok make sure to remove sysfs unbinding then.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller driver

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#1461563 — Re: [PATCH 1/3] clk: meson: Add GXBB AO Clock and Reset controller driver

#1463789

#1463957