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Thu, 13 Feb 2025 11:47:56 -0800 (PST) Received: from droid-r8s ([38.44.237.182]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-2b95a6bf7b3sm1049692fac.32.2025.02.13.11.47.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Feb 2025 11:47:56 -0800 (PST) Date: Thu, 13 Feb 2025 19:47:45 +0000 From: Denzeel Oliva To: Tudor Ambarus Cc: alim.akhtar@samsung.com, andi.shyti@kernel.org, andre.draszik@linaro.org, broonie@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-spi@vger.kernel.org, peter.griffin@linaro.org, robh@kernel.org, wachiturroxd150@gmail.com Subject: Re: [PATCH v1 0/2] spi: s3c64xx: add support for samsung,exynos990-spi Message-ID: References: <20250212191241.280-1-wachiturroxd150@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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