linux-kernel - Re: [PATCH v2 3/7] mfd: add support for sun6i PRCM (Power/Reset/Clock Management) unit

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Message-ID: <536BE366.8080907@free-electrons.com>
Date:	Thu, 08 May 2014 22:04:54 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	Emilio López <emilio@...pez.com.ar>,
	Mike Turquette <mturquette@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Shuge <shuge@...winnertech.com>, kevin@...winnertech.com,
	Hans de Goede <hdegoede@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dev@...ux-sunxi.org
Subject: Re: [PATCH v2 3/7] mfd: add support for sun6i PRCM (Power/Reset/Clock
 Management) unit


On 08/05/2014 13:02, Lee Jones wrote:
>> The PRCM (Power/Reset/Clock Management) block exposes several subdevices
>> in different subsystems (clk, reset ...)
>>
>> Add basic support for the PRCM unit with clk (AR100, AHB0, and APB0 clks)
>> and reset controller subdevices.
>>
>> Other subdevices might be added later (if needed).
>>
>> Signed-off-by: Boris BREZILLON <boris.brezillon@...e-electrons.com>
>> ---
>>  drivers/mfd/Kconfig      |   8 +++
>>  drivers/mfd/Makefile     |   1 +
>>  drivers/mfd/sun6i-prcm.c | 151 +++++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 160 insertions(+)
>>  create mode 100644 drivers/mfd/sun6i-prcm.c
> [...]
>
>> +#include <linux/module.h>
>> +#include <linux/kernel.h>
>> +#include <linux/errno.h>
>> +#include <linux/err.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/io.h>
>> +#include <linux/slab.h>
>> +#include <linux/mutex.h>
>> +#include <linux/completion.h>
>> +#include <linux/irq.h>
>> +#include <linux/jiffies.h>
>> +#include <linux/bitops.h>
>> +#include <linux/fs.h>
>> +#include <linux/of.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/uaccess.h>
>> +#include <linux/mfd/core.h>
> I'm pretty sure you don't need half of these.  Please only add the
> ones you make use of.

Sure (this is what happens when you copy/paste from another driver :-))

>
> [...]
>
>> +	dev_info(&pdev->dev, "PRCM initialized\n");
> Please remove this from here.

Okay.

>
> [...]
>
>> +static struct platform_driver sun6i_prcm_driver = {
>> +	.driver = {
>> +		.name = "sun6i-prcm",
>> +		.owner = THIS_MODULE,
>> +		.of_match_table = sun6i_prcm_dt_ids,
>> +	},
>> +	.probe = sun6i_prcm_probe,
> You need a .remove() call-back.

This driver cannot be compiled as module (see the Kconfig definition)
and the devices are not hotpluggable, as a result a probed device will
never be removed.

Do you still want me to implement the remove function ?

>
>> +};
>> +module_platform_driver(sun6i_prcm_driver);
>> +
>> +MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@...e-electrons.com>");
>> +MODULE_DESCRIPTION("Allwinner sun6i PRCM driver");
>> +MODULE_LICENSE("GPL v2");

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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