linux-kernel - Re: [PATCH v6 00/18] mtd: nand: denali: Denali NAND IP patch bomb

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Date:   Tue, 13 Jun 2017 17:17:41 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Richard Weinberger <richard@....at>,
        Marek Vasut <marek.vasut@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Chuanxiao Dong <chuanxiao.dong@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dinh Nguyen <dinguyen@...nel.org>,
        linux-mtd@...ts.infradead.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Brian Norris <computersforpeace@...il.com>,
        Enrico Jorns <ejo@...gutronix.de>
Subject: Re: [PATCH v6 00/18] mtd: nand: denali: Denali NAND IP patch bomb

Hi Boris,


2017-06-13 16:02 GMT+09:00 Boris Brezillon <boris.brezillon@...e-electrons.com>:

>
> BTW, I also implemented ->read/write_buf_word() since the core may one
> day call these functions, and the default implementations used by the
> core when these hooks are NULL are not appropriate in your case.
>

BTW, why doesn't the default hook in the core do like this?


static uint8_t nand_read_byte(struct mtd_info *mtd)
{
        struct nand_chip *chip = mtd_to_nand(mtd);
        uint8_t byte;

        chip->read_buf(chip, &byte, 1);
        return byte;
}


->read_byte() is a special case of ->read_buf() with length==1,
so this should work.




-- 
Best Regards
Masahiro Yamada