linux-kernel - Re: [PATCH v3 03/11] clk: davinci - common clk utilities to init clk driver

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Message-ID: <509926FA.3050700@ti.com>
Date:	Tue, 6 Nov 2012 10:04:26 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	Sekhar Nori <nsekhar@...com>
CC:	<mturquette@...aro.org>, <arnd@...db.de>,
	<akpm@...ux-foundation.org>, <shawn.guo@...aro.org>,
	<rob.herring@...xeda.com>, <linus.walleij@...aro.org>,
	<viresh.linux@...il.com>, <linux-kernel@...r.kernel.org>,
	<khilman@...com>, <linux@....linux.org.uk>, <sshtylyov@...sta.com>,
	<davinci-linux-open-source@...ux.davincidsp.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-keystone@...t.ti.com>
Subject: Re: [PATCH v3 03/11] clk: davinci - common clk utilities to init
 clk driver

On 11/06/2012 04:31 AM, Sekhar Nori wrote:
>
> On 11/5/2012 8:50 PM, Murali Karicheri wrote:
>> On 11/03/2012 08:35 AM, Sekhar Nori wrote:
>>> On 10/25/2012 9:41 PM, Murali Karicheri wrote:
>>>> This is the common clk driver initialization functions for DaVinci
>>>> SoCs and other SoCs that uses similar hardware architecture.
>>>> clock.h also defines struct types for clock definitions in a SoC
>>>> and clock data type for configuring clk-mux. The initialization
>>>> functions are used by clock initialization code in a specific
>>>> platform/SoC.
>>>>
>>>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>>>> ---
>>>>    drivers/clk/davinci/clock.c |  112
>>>> +++++++++++++++++++++++++++++++++++++++++++
>>>>    drivers/clk/davinci/clock.h |   80 +++++++++++++++++++++++++++++++
>>>>    2 files changed, 192 insertions(+)
>>>>    create mode 100644 drivers/clk/davinci/clock.c
>>>>    create mode 100644 drivers/clk/davinci/clock.h
>>>>
>>>> diff --git a/drivers/clk/davinci/clock.c b/drivers/clk/davinci/clock.c
>>>> new file mode 100644
>>>> index 0000000..ad02149
>>>> --- /dev/null
>>>> +++ b/drivers/clk/davinci/clock.c
>>>> @@ -0,0 +1,112 @@
>>>> +/*
>>>> + * clock.c - davinci clock initialization functions for various clocks
>>>> + *
>>>> + * Copyright (C) 2006-2012 Texas Instruments.
>>>> + * Copyright (C) 2008-2009 Deep Root Systems, LLC
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or modify
>>>> + * it under the terms of the GNU General Public License as published by
>>>> + * the Free Software Foundation; either version 2 of the License, or
>>>> + * (at your option) any later version.
>>>> + */
>>>> +#include <linux/init.h>
>>>> +#include <linux/clk-provider.h>
>>>> +#include <linux/clkdev.h>
>>>> +#include <linux/io.h>
>>>> +#include <linux/slab.h>
>>>> +
>>>> +#include "clk-pll.h"
>>>> +#include "clk-psc.h"
>>>> +#include "clk-div.h"
>>>> +#include "clock.h"
>>>> +
>>>> +static DEFINE_SPINLOCK(_lock);
>>>> +
>>>> +#ifdef    CONFIG_CLK_DAVINCI_PLL
>>>> +struct clk *davinci_pll_clk(const char *name, const char *parent,
>>>> +        u32 phys_pllm, u32 phys_prediv, u32 phys_postdiv,
>>>> +        struct clk_pll_data *pll_data)
>>>> +{
>>>> +    struct clk *clkp = NULL;
>>>> +
>>>> +    pll_data->reg_pllm = ioremap(phys_pllm, 4);
>>>> +    if (WARN_ON(!pll_data->reg_pllm))
>>>> +        return clkp;
>>> I would prefer ERR_PTR(-ENOMEM) here. Same comment applies to other
>>> instances elsewhere in the patch.
>>>
>>>> diff --git a/drivers/clk/davinci/clock.h b/drivers/clk/davinci/clock.h
>>>> new file mode 100644
>>>> index 0000000..73204b8
>>>> --- /dev/null
>>>> +++ b/drivers/clk/davinci/clock.h
>>>> @@ -0,0 +1,80 @@
>>>> +/*
>>>> + * TI DaVinci Clock definitions -  Contains Macros and Types used for
>>>> + * defining various clocks on a DaVinci SoC
>>>> + *
>>>> + * Copyright (C) 2012 Texas Instruments
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or
>>>> + * modify it under the terms of the GNU General Public License as
>>>> + * published by the Free Software Foundation version 2.
>>>> + *
>>>> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
>>>> + * kind, whether express or implied; without even the implied warranty
>>>> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>>>> + * GNU General Public License for more details.
>>>> + */
>>>> +#ifndef __DAVINCI_CLOCK_H
>>>> +#define __DAVINCI_CLOCK_H
>>>> +
>>>> +#include <linux/types.h>
>>>> +
>>>> +/* general flags: */
>>>> +#define ALWAYS_ENABLED        BIT(0)
>>> This is not used in this patch. Can you add the define along with its
>>> usage so it is immediately clear why you need it?
>> This is used on the next patch as this adds a bunch of utilities or
>> types for the platform specific clock code. Do you want to combine this
>> patch with 05/11?  It will become a bigger patch then? Is that fine.
>> IMO, this is a logical group that can be a standalone patch than
>> combining with 05/11.
> It is more important to divide patches in logical functional blocks
> rather than split it based on files. Reading this patch, I have no idea
> what that define is for.
>
> Thanks,
> Sekhar
>
>
Will combine with 05/11 since utilities are used by the clock init code 
in dm644x.
Murali
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