linux-kernel - Re: [PATCH v3 13/37] mtd: nand: denali: avoid hard-coding ecc.strength and ecc.bytes

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Date:   Fri, 31 Mar 2017 11:09:38 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-mtd@...ts.infradead.org, Enrico Jorns <ejo@...gutronix.de>,
        Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Graham Moore <grmoore@...nsource.altera.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Chuanxiao Dong <chuanxiao.dong@...el.com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        linux-kernel@...r.kernel.org,
        Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Subject: Re: [PATCH v3 13/37] mtd: nand: denali: avoid hard-coding
 ecc.strength and ecc.bytes

On Thu, 30 Mar 2017 15:45:59 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

>  
> diff --git a/drivers/mtd/nand/denali_dt.c b/drivers/mtd/nand/denali_dt.c
> index 1681a30..c3bc333 100644
> --- a/drivers/mtd/nand/denali_dt.c
> +++ b/drivers/mtd/nand/denali_dt.c
> @@ -31,10 +31,12 @@ struct denali_dt {
>  
>  struct denali_dt_data {
>  	unsigned int revision;
> +	unsigned long ecc_strength_avail;

Shouldn't you directly make sure that your driver will support
strengths > BITS_PER_LONG?
I would store the supported strength in a table to make it more
future-proof:

	int *ecc_strength_avail;
	int num_ecc_strengths;


>  	unsigned int caps;
>  };
>