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

From: [email-masked] (Sekhar Nori)
Date: Tue, 6 Nov 2012 15:01:48 +0530

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 <[email-masked]>
>>> ---
>>>   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