linux-kernel - Re: [PATCH v2 1/5] mtd: spi-nor: notify (Q)SPI controller about protocol change

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Date:	Wed, 22 Jul 2015 15:41:46 +0200
From:	Marek Vasut <marex@...x.de>
To:	Cyrille Pitchen <cyrille.pitchen@...el.com>
Cc:	nicolas.ferre@...el.com, broonie@...nel.org,
	linux-spi@...r.kernel.org, dwmw2@...radead.org,
	computersforpeace@...il.com, zajec5@...il.com, beanhuo@...ron.com,
	juhosg@...nwrt.org, shijie.huang@...el.com, ben@...adent.org.uk,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v2 1/5] mtd: spi-nor: notify (Q)SPI controller about protocol change

On Wednesday, July 22, 2015 at 03:17:06 PM, Cyrille Pitchen wrote:
> Once the Quad SPI mode has been enabled on a Micron flash memory, this
> device expects ALL the following commands to use the SPI 4-4-4 protocol.
> The (Q)SPI controller needs to be notified about the protocol change so it
> can adapt and keep on dialoging with the Micron memory.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 17 +++++++++++++++++
>  include/linux/mtd/spi-nor.h   | 13 +++++++++++++
>  2 files changed, 30 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index d78831b4422b..93627d4e6be8 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -163,6 +163,18 @@ static inline int write_disable(struct spi_nor *nor)
>  	return nor->write_reg(nor, SPINOR_OP_WRDI, NULL, 0, 0);
>  }
> 
> +/*
> + * Notify the (Q)SPI controller about the new protocol to be used.

Hi!

Can you please just reword this a little, so that it is absolutelly clear
even to the less bright of us (like me) that this is a notification coming
from the upper layers (ie. the spi-nor framework) toward the hardware ?

> + */
> +static inline int spi_nor_set_protocol(struct spi_nor *nor,
> +				       enum spi_protocol proto)
> +{
> +	if (nor->set_protocol)
> +		return nor->set_protocol(nor, proto);
> +
> +	return 0;
> +}
> +
>  static inline struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
>  {
>  	return mtd->priv;

[...]

Best regards,
Marek Vasut
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