linux-kernel - Re: [PATCH v4 10/15] mtd: nand: move Micron specific init logic in nand

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Message-ID: <4f82a1e8-be0b-4dd5-f26e-b97af80029cd@gmail.com>
Date:   Wed, 4 Jan 2017 18:22:31 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Richard Weinberger <richard@....at>, linux-mtd@...ts.infradead.org,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Icenowy Zheng <icenowy@...c.xyz>, Valdis.Kletnieks@...edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 10/15] mtd: nand: move Micron specific init logic in
 nand_micron.c

On 01/04/2017 06:13 PM, Boris Brezillon wrote:
> On Wed, 4 Jan 2017 16:15:46 +0100
> Marek Vasut <marek.vasut@...il.com> wrote:
> 
>> On 01/03/2017 02:01 PM, Boris Brezillon wrote:
>>> Move Micron specific initialization logic into nand_micron.c. This is
>>> part of the "separate vendor specific code from core" cleanup process.
>>>
>>> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>  
>>
>> [...]
>>
>>> diff --git a/drivers/mtd/nand/nand_micron.c b/drivers/mtd/nand/nand_micron.c
>>> new file mode 100644
>>> index 000000000000..ddb9adf12c21
>>> --- /dev/null
>>> +++ b/drivers/mtd/nand/nand_micron.c
>>> @@ -0,0 +1,83 @@
>>> +/*
>>> + * Copyright (C) 2013 Boris Brezillon <boris.brezillon@...e-electrons.com>  
>>
>> 2013-2017 ?
> 
> 2017, indeed.
> 
>>
>>> + * 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.
>>> + *
>>> + * 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.
>>> + */
>>> +
>>> +#include <linux/mtd/nand.h>
>>> +
>>> +struct nand_onfi_vendor_micron {
>>> +	u8 two_plane_read;
>>> +	u8 read_cache;
>>> +	u8 read_unique_id;
>>> +	u8 dq_imped;
>>> +	u8 dq_imped_num_settings;
>>> +	u8 dq_imped_feat_addr;
>>> +	u8 rb_pulldown_strength;
>>> +	u8 rb_pulldown_strength_feat_addr;
>>> +	u8 rb_pulldown_strength_num_settings;
>>> +	u8 otp_mode;
>>> +	u8 otp_page_start;
>>> +	u8 otp_data_prot_addr;
>>> +	u8 otp_num_pages;
>>> +	u8 otp_feat_addr;
>>> +	u8 read_retry_options;
>>> +	u8 reserved[72];
>>> +	u8 param_revision;
>>> +} __packed;  
>>
>> Is this __packed really needed?
>>
> 
> I'm just copying an existing structure. And yes, it's probably unneeded
> since all fields are u8, and the struct size in a multiple of 8 bytes,
> but it shouldn't hurt either. 
> 
Could you send a patch to drop it, please ? :)

-- 
Best regards,
Marek Vasut