linux-kernel - Re: [PATCH] mtd: spi-nor: Add support for BoHong bh25q128as

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Message-Id: <CZ8X218EWPC9.25TO9O5C7VXQ9@kernel.org>
Date: Mon, 19 Feb 2024 09:35:27 +0100
From: "Michael Walle" <mwalle@...nel.org>
To: "Christian Marangi" <ansuelsmth@...il.com>, "Tudor Ambarus"
 <tudor.ambarus@...aro.org>, "Pratyush Yadav" <pratyush@...nel.org>, "Miquel
 Raynal" <miquel.raynal@...tlin.com>, "Richard Weinberger" <richard@....at>,
 "Vignesh Raghavendra" <vigneshr@...com>, <linux-kernel@...r.kernel.org>,
 <linux-mtd@...ts.infradead.org>
Cc: "David Bauer" <mail@...id-bauer.net>
Subject: Re: [PATCH] mtd: spi-nor: Add support for BoHong bh25q128as

Hi,

On Sat Feb 17, 2024 at 1:20 PM CET, Christian Marangi wrote:
> From: David Bauer <mail@...id-bauer.net>
>
> Add MTD support for the BoHong bh25q128as SPI NOR chip.
> The chip has 16MB of total capacity, divided into a total of 256
> sectors, each 64KB sized. The chip also supports 4KB sectors.
> Additionally, it supports dual and quad read modes.
>
> Datasheet is public and can be found here [1].

Last time it wasn't clear if this flash will support SFDP or not.
Could you please try to dump the SFDP again, see [1].


> Functionality was verified on an Tenbay WR1800K / MTK MT7621 board.

Also per [1], you'd need to provide your test results.

> [1] https://www.e-interlink.com.tw/userUpload/files/BH25Q128AS_v1_0.pdf

Link: right above your SoB please.

> Signed-off-by: David Bauer <mail@...id-bauer.net>
> [ reworked to new flash_info format ]
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>  drivers/mtd/spi-nor/Makefile |  1 +
>  drivers/mtd/spi-nor/bohong.c | 24 ++++++++++++++++++++++++
>  drivers/mtd/spi-nor/core.c   |  1 +
>  drivers/mtd/spi-nor/core.h   |  1 +
>  4 files changed, 27 insertions(+)
>  create mode 100644 drivers/mtd/spi-nor/bohong.c
>
> diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
> index 5e68468b72fc..c8849cf5124f 100644
> --- a/drivers/mtd/spi-nor/Makefile
> +++ b/drivers/mtd/spi-nor/Makefile
> @@ -2,6 +2,7 @@
>  
>  spi-nor-objs			:= core.o sfdp.o swp.o otp.o sysfs.o
>  spi-nor-objs			+= atmel.o
> +spi-nor-objs			+= bohong.o
>  spi-nor-objs			+= eon.o
>  spi-nor-objs			+= esmt.o
>  spi-nor-objs			+= everspin.o
> diff --git a/drivers/mtd/spi-nor/bohong.c b/drivers/mtd/spi-nor/bohong.c
> new file mode 100644
> index 000000000000..26988c139262
> --- /dev/null
> +++ b/drivers/mtd/spi-nor/bohong.c
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2005, Intec Automation Inc.
> + * Copyright (C) 2014, Freescale Semiconductor, Inc.

Please remove, there is nothing from the old code left here.

> + */
> +
> +#include <linux/mtd/spi-nor.h>
> +
> +#include "core.h"
> +
> +static const struct flash_info bohong_parts[] = {
> +	{
> +		.id = SNOR_ID(0x68, 0x40, 0x18),
> +		.name = "bh25q128as",
No names anymore, please.

> +		.size = SZ_16M,
> +		.no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
> +	},
> +};
> +
> +const struct spi_nor_manufacturer spi_nor_bohong = {
> +	.name = "bohong",

This should be dropped, too. Otherwise looks good, if SFDP is not
supported.

-michael

[1] https://docs.kernel.org/driver-api/mtd/spi-nor.html

> +	.parts = bohong_parts,
> +	.nparts = ARRAY_SIZE(bohong_parts),
> +};
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 4129764fad8c..29c28ee683a1 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2037,6 +2037,7 @@ int spi_nor_sr2_bit7_quad_enable(struct spi_nor *nor)
>  
>  static const struct spi_nor_manufacturer *manufacturers[] = {
>  	&spi_nor_atmel,
> +	&spi_nor_bohong,
>  	&spi_nor_eon,
>  	&spi_nor_esmt,
>  	&spi_nor_everspin,
> diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
> index d36c0e072954..c293568ae827 100644
> --- a/drivers/mtd/spi-nor/core.h
> +++ b/drivers/mtd/spi-nor/core.h
> @@ -601,6 +601,7 @@ struct sfdp {
>  
>  /* Manufacturer drivers. */
>  extern const struct spi_nor_manufacturer spi_nor_atmel;
> +extern const struct spi_nor_manufacturer spi_nor_bohong;
>  extern const struct spi_nor_manufacturer spi_nor_eon;
>  extern const struct spi_nor_manufacturer spi_nor_esmt;
>  extern const struct spi_nor_manufacturer spi_nor_everspin;


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