linux-kernel - Re: [PATCH v1 0/2] spi: s3c64xx: add support for samsung,exynos990-spi

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Message-ID: <Z65MYSNuDdCFNlv6@droid-r8s>
Date: Thu, 13 Feb 2025 19:47:45 +0000
From: Denzeel Oliva <wachiturroxd150@...il.com>
To: Tudor Ambarus <tudor.ambarus@...aro.org>
Cc: alim.akhtar@...sung.com, andi.shyti@...nel.org,
	andre.draszik@...aro.org, broonie@...nel.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, krzk+dt@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-spi@...r.kernel.org,
	peter.griffin@...aro.org, robh@...nel.org,
	wachiturroxd150@...il.com
Subject: Re: [PATCH v1 0/2] spi: s3c64xx: add support for
 samsung,exynos990-spi

On Thu, Feb 13, 2025 at 07:05:22AM +0000, Tudor Ambarus wrote:
> gs101 mandates 32-bit accesses too.

Also in exynos990 [0]

> > the SPI node where it will have to be specified in DT (Device Tree).
> 
> gs101 has some USI nodes that can work only in uart mode and indeed the
> fifosize there is 256. Does downstream define SPI nodes with 256 bytes
> FIFOs? Can you please point me the the downstream code?
> 

Yes, Exynos990 has SPI nodes with 256-byte FIFOs, and you can see this in
the downstream kernel. Here are some relevant references:

- SPI8: [1]
- SPI9: [2]
- SPI10: [3]

Best regards,
Denzeel

[0] https://github.com/pascua28/android_kernel_samsung_s20fe/blob/3be539e9cd22b89ba3cc8282945a0c46ff27341d/drivers/spi/spi-s3c64xx.c#L767
[1] https://github.com/pascua28/android_kernel_samsung_s20fe/blob/3be539e9cd22b89ba3cc8282945a0c46ff27341d/arch/arm64/boot/dts/exynos/exynos9830-usi.dtsi#L1641
[2] https://github.com/pascua28/android_kernel_samsung_s20fe/blob/3be539e9cd22b89ba3cc8282945a0c46ff27341d/arch/arm64/boot/dts/exynos/exynos9830-usi.dtsi#L1662
[3] https://github.com/pascua28/android_kernel_samsung_s20fe/blob/3be539e9cd22b89ba3cc8282945a0c46ff27341d/arch/arm64/boot/dts/exynos/exynos9830-usi.dtsi#L1683