Add support for SPI NAND flashes on ARM64 boards/EVMs such as:

1. W35N01JW on AM62x LP SK, AM62Ax SK, J721S2 EVM, J784S4 EVM,
   J722S EVM, J742S2 EVM
2. W25N01JW on AM62Lx EVM

by enabling the MTD_SPI_NAND config as a module.

Signed-off-by: Santhosh Kumar K <s-k6@ti.com>
---

Repo: https://github.com/santhosh21/linux/tree/uL_next
Test results: https://gist.github.com/santhosh21/71ab6646dccc238a0b3c47c0382f219a

Regards,
Santhosh.

 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index dfa5c8d5b658..69e0c458c763 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -283,6 +283,7 @@ CONFIG_MTD_NAND_BRCMNAND=m
 CONFIG_MTD_NAND_FSL_IFC=y
 CONFIG_MTD_NAND_QCOM=y
 CONFIG_MTD_SPI_NOR=y
+CONFIG_MTD_SPI_NAND=m
 CONFIG_MTD_UBI=m
 CONFIG_MTD_HYPERBUS=m
 CONFIG_HBMC_AM654=m
-- 
2.34.1

On 02/01/2025 13:00, Santhosh Kumar K wrote:
> Add support for SPI NAND flashes on ARM64 boards/EVMs such as:
> 
> 1. W35N01JW on AM62x LP SK, AM62Ax SK, J721S2 EVM, J784S4 EVM,
>    J722S EVM, J742S2 EVM
> 2. W25N01JW on AM62Lx EVM
> 
Please use recognizable names. git grep -i on some of above gave me zero
results, so no models, no compatibles, no makefile entries use above
names. Also really not sure where to look for - which vendor. This is
defconfig for all users of arm64, not your private one.

Best regards,
Krzysztof

Hi, Krzysztof,

On 02/01/25 21:35, Krzysztof Kozlowski wrote:
> On 02/01/2025 13:00, Santhosh Kumar K wrote:
>> Add support for SPI NAND flashes on ARM64 boards/EVMs such as:
>>
>> 1. W35N01JW on AM62x LP SK, AM62Ax SK, J721S2 EVM, J784S4 EVM,
>>     J722S EVM, J742S2 EVM
>> 2. W25N01JW on AM62Lx EVM
>>
> Please use recognizable names. git grep -i on some of above gave me zero
> results, so no models, no compatibles, no makefile entries use above
> names. Also really not sure where to look for - which vendor. This is
> defconfig for all users of arm64, not your private one.\

'git grep -i' on most of the above names results it's entry either from 
arch/arm64/boot/dts/ti/k3-*.dts or from drivers/mtd/nand/spi/winbond.c 
except for W35N01JW and AM62Lx EVM as the series which adds support for 
W35N01JW [1] and AM62Lx EVM [2] are yet to be merged.

Some 'git grep -i' results for your reference:
$ git grep -i "AM62x LP SK" 
 

arch/arm64/boot/dts/ti/k3-am62-lp-sk.dts:14:    model = "Texas 
Instruments AM62x LP SK";

$ git grep -i "J784S4 EVM"
arch/arm64/boot/dts/ti/k3-j784s4-evm.dts:17:    model = "Texas 
Instruments J784S4 EVM";

$ git grep -i W25N01JW
drivers/mtd/nand/spi/winbond.c:254:     SPINAND_INFO("W25N01JW", /* 
high-speed 1.8V */

Nit: 'AM62Ax SK' should be 'AM62A7 SK'. I'll edit it in v2.

[1] 
https://lore.kernel.org/linux-mtd/20250102115110.1402440-1-s-k6@ti.com/T/#mfbbfc8852e70a077d2adbba0a4fddeed7b4237f1
[2] 
https://lore.kernel.org/linux-arm-kernel/20241117-am62lx-v1-0-4e71e42d781d@ti.com/

Thanks and Regards,
Santhosh.

> 
> Best regards,
> Krzysztof