linux-kernel - Re: [PATCH 6/8] mtd: rawnand: jz4780-bch: Don't set clock rate in driver

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Date:   Fri, 18 Jan 2019 09:31:16 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH 6/8] mtd: rawnand: jz4780-bch: Don't set clock rate in
 driver

On Thu, 17 Jan 2019 22:06:32 -0300
Paul Cercueil <paul@...pouillou.net> wrote:

> This should be done in devicetree. Besides, it prevents us from
> supporting other SoCs which don't use the same clock frequency for the
> BCH hardware.

As I said earlier, I disagree with this statement, plus, you're
breaking backward compat with existing DTs when doing that.

> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  drivers/mtd/nand/raw/jz4780_bch.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/jz4780_bch.c b/drivers/mtd/nand/raw/jz4780_bch.c
> index 7e4e5e627603..161d3821e1c4 100644
> --- a/drivers/mtd/nand/raw/jz4780_bch.c
> +++ b/drivers/mtd/nand/raw/jz4780_bch.c
> @@ -57,8 +57,6 @@
>  #define BCH_BHINT_UNCOR			BIT(1)
>  #define BCH_BHINT_ERR			BIT(0)
>  
> -#define BCH_CLK_RATE			(200 * 1000 * 1000)
> -
>  /* Timeout for BCH calculation/correction. */
>  #define BCH_TIMEOUT_US			100000
>  
> @@ -348,8 +346,6 @@ static int jz4780_bch_probe(struct platform_device *pdev)
>  		return PTR_ERR(bch->clk);
>  	}
>  
> -	clk_set_rate(bch->clk, BCH_CLK_RATE);
> -
>  	mutex_init(&bch->lock);
>  
>  	bch->dev = dev;