linux-kernel - Re: [PATCH 3/3] mtd: spi-nor: cadence-quadspi: Add support for Octal SPI controller

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Date:   Mon, 10 Dec 2018 09:45:13 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Vignesh R <vigneshr@...com>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Brian Norris <computersforpeace@...il.com>,
        Yogesh Gaur <yogeshnarayan.gaur@....com>,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>,
        <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mtd: spi-nor: cadence-quadspi: Add support for
 Octal SPI controller

On Wed, 3 Oct 2018 22:26:03 +0530
Vignesh R <vigneshr@...com> wrote:

> Cadence OSPI controller IP supports Octal IO (x8 IO lines),
> It also has an integrated PHY. IP register layout is very
> similar to existing QSPI IP except for additional bits to support Octal
> and Octal DDR mode. Therefore, extend current driver to support Octal
> mode.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>
> ---
>  drivers/mtd/spi-nor/cadence-quadspi.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
> index e24db817154e..48b00e75a879 100644
> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
> @@ -101,6 +101,7 @@ struct cqspi_st {
>  #define CQSPI_INST_TYPE_SINGLE			0
>  #define CQSPI_INST_TYPE_DUAL			1
>  #define CQSPI_INST_TYPE_QUAD			2
> +#define CQSPI_INST_TYPE_OCTAL			3
>  
>  #define CQSPI_DUMMY_CLKS_PER_BYTE		8
>  #define CQSPI_DUMMY_BYTES_MAX			4
> @@ -898,6 +899,9 @@ static int cqspi_set_protocol(struct spi_nor *nor, const int read)
>  		case SNOR_PROTO_1_1_4:
>  			f_pdata->data_width = CQSPI_INST_TYPE_QUAD;
>  			break;
> +		case SNOR_PROTO_1_1_8:
> +			f_pdata->data_width = CQSPI_INST_TYPE_OCTAL;
> +			break;
>  		default:
>  			return -EINVAL;
>  		}
> @@ -1205,6 +1209,7 @@ static int cqspi_setup_flash(struct cqspi_st *cqspi, struct device_node *np)
>  			SNOR_HWCAPS_READ_FAST |
>  			SNOR_HWCAPS_READ_1_1_2 |
>  			SNOR_HWCAPS_READ_1_1_4 |
> +			SNOR_HWCAPS_READ_1_1_8 |

Is this really supported on qspi versions of this IP? I guess not given
the description in the commit message and the name of the new
compatible (ospi instead of qspi).

>  			SNOR_HWCAPS_PP,
>  	};
>  	struct platform_device *pdev = cqspi->pdev;
> @@ -1456,6 +1461,10 @@ static const struct of_device_id cqspi_dt_ids[] = {
>  		.compatible = "ti,k2g-qspi",
>  		.data = (void *)CQSPI_NEEDS_WR_DELAY,
>  	},
> +	{
> +		.compatible = "ti,am654-ospi",
> +		.data = (void *)CQSPI_NEEDS_WR_DELAY,
> +	},
>  	{ /* end of table */ }
>  };
>