[PATCH v2] mtd: spi-nor: siliconkaiser: add support for sk25lp128

[Tudor.Ambarus at microchip.com]

On 6/3/22 17:16, Tom Fitzhenry wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Add support for the siliconkaiser sk25lp128 chip.
> 
> This is the flash chip used in the PinePhone Pro[0], found by physical
> inspection of the board.[1]
> 
> I cannot find a datasheet, but this chip supports SFDP.
> 
> This patch depends on SNOR_ID3().[2]
> 
> Tested done: checked that the Pinephone Pro boots when a ROM is written to
> /dev/mtdblock0.
> 
> $ xxd -p /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
> 53464450060101ff00060110300000ff9d05010380000002ffffffffffff
> ffffffffffffffffffffffffffffffffffffe520f9ffffffff0744eb086b
> 083b80bbfeffffffffff00ffffff44eb0c200f5210d800ff234ac90082d8
> 11c7cccd68467a757a75f7a2d55c4a422cfff030c080ffffffffffffffff
> ffffffffffffffff501950169cf9c0648fecffff
> $ md5sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
> de4d6be54e479d60859b0ca8a0ee9216
> /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
> $ cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
> 257018
> $ cat /sys/bus/spi/devices/spi0.0/spi-nor/partname
> sk25lp128
> $ cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
> siliconkaiser
> 
> 0. https://wiki.pine64.org/wiki/PinePhone_Pro#Specifications
> 1. Thanks to https://github.com/Biktorgj for finding that.
> 2. https://lore.kernel.org/all/20220510140232.3519184-1-michael@walle.cc/
> 
> Link: https://lore.kernel.org/all/28d3925a-983a-fcb8-19af-6e6baf892d53@tom-fitzhenry.me.uk/
> Signed-off-by: Tom Fitzhenry <tom at tom-fitzhenry.me.uk>
> ---
>  drivers/mtd/spi-nor/Makefile        |  1 +
>  drivers/mtd/spi-nor/core.c          |  1 +
>  drivers/mtd/spi-nor/core.h          |  1 +
>  drivers/mtd/spi-nor/siliconkaiser.c | 15 +++++++++++++++
>  4 files changed, 18 insertions(+)
>  create mode 100644 drivers/mtd/spi-nor/siliconkaiser.c
> 
> diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
> index e347b435a038..314ac7773369 100644
> --- a/drivers/mtd/spi-nor/Makefile
> +++ b/drivers/mtd/spi-nor/Makefile
> @@ -12,6 +12,7 @@ spi-nor-objs                  += intel.o
>  spi-nor-objs                   += issi.o
>  spi-nor-objs                   += macronix.o
>  spi-nor-objs                   += micron-st.o
> +spi-nor-objs                   += siliconkaiser.o
>  spi-nor-objs                   += spansion.o
>  spi-nor-objs                   += sst.o
>  spi-nor-objs                   += winbond.o
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index fdde80d9f388..e542d3009915 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -1624,6 +1624,7 @@ static const struct spi_nor_manufacturer *manufacturers[] = {
>         &spi_nor_issi,
>         &spi_nor_macronix,
>         &spi_nor_micron,
> +       &spi_nor_siliconkaiser,
>         &spi_nor_st,
>         &spi_nor_spansion,
>         &spi_nor_sst,
> diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
> index 87183cff3251..8997099f6c5e 100644
> --- a/drivers/mtd/spi-nor/core.h
> +++ b/drivers/mtd/spi-nor/core.h
> @@ -625,6 +625,7 @@ extern const struct spi_nor_manufacturer spi_nor_intel;
>  extern const struct spi_nor_manufacturer spi_nor_issi;
>  extern const struct spi_nor_manufacturer spi_nor_macronix;
>  extern const struct spi_nor_manufacturer spi_nor_micron;
> +extern const struct spi_nor_manufacturer spi_nor_siliconkaiser;
>  extern const struct spi_nor_manufacturer spi_nor_st;
>  extern const struct spi_nor_manufacturer spi_nor_spansion;
>  extern const struct spi_nor_manufacturer spi_nor_sst;
> diff --git a/drivers/mtd/spi-nor/siliconkaiser.c b/drivers/mtd/spi-nor/siliconkaiser.c
> new file mode 100644
> index 000000000000..c3ca157244b8
> --- /dev/null
> +++ b/drivers/mtd/spi-nor/siliconkaiser.c
> @@ -0,0 +1,15 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/mtd/spi-nor.h>
> +
> +#include "core.h"
> +
> +static const struct flash_info siliconkaiser_nor_parts[] = {
> +       { "sk25lp128", SNOR_ID3(0x257018) },

Does this flash implement the manufacturer ID continuation codes?
Can you read more bytes of manufacturer ID and dump them?

This manufacturer ID collides with Tristar manufacturer ID from bank 1.
Check JEP106 standard please.
If the flash does not define the continuation codes, we'll need to
add this flash in a ID collisions driver.

ta

> +};
> +
> +const struct spi_nor_manufacturer spi_nor_siliconkaiser = {
> +       .name = "siliconkaiser",
> +       .parts = siliconkaiser_nor_parts,
> +       .nparts = ARRAY_SIZE(siliconkaiser_nor_parts),
> +};
> --
> 2.36.0
>