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[86.49.110.70]) by smtp.gmail.com with ESMTPSA id j6sm20543909wrw.30.2018.12.05.04.57.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 05 Dec 2018 04:57:51 -0800 (PST) Subject: Re: [PATCH v2 2/2] dt-binding: spi: Document Renesas R-Car Gen3 RPC controller bindings To: masonccyang@mxic.com.tw Cc: boris.brezillon@bootlin.com, broonie@kernel.org, Geert Uytterhoeven , Simon Horman , juliensu@mxic.com.tw, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-spi@vger.kernel.org, zhengxunli@mxic.com.tw References: <1543828720-18345-1-git-send-email-masonccyang@mxic.com.tw> <1543828720-18345-3-git-send-email-masonccyang@mxic.com.tw> <2e719883-4cfd-b456-b894-853e99515092@gmail.com> From: Marek Vasut Message-ID: <4976dae8-222f-b7a1-ca5b-4abf3c5f26db@gmail.com> Date: Wed, 5 Dec 2018 13:53:16 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=big5 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/05/2018 09:39 AM, masonccyang@mxic.com.tw wrote: > Hi Marek, Hi, >> "Marek Vasut" >> 2018/12/05 ¤W¤È 10:04 >> >> To >> >> "Mason Yang" , broonie@kernel.org, linux- >> kernel@vger.kernel.org, linux-spi@vger.kernel.org, >> boris.brezillon@bootlin.com, linux-renesas-soc@vger.kernel.org, >> "Geert Uytterhoeven" , >> >> cc >> >> juliensu@mxic.com.tw, "Simon Horman" , >> zhengxunli@mxic.com.tw >> >> Subject >> >> Re: [PATCH v2 2/2] dt-binding: spi: Document Renesas R-Car Gen3 RPC >> controller bindings >> >> On 12/03/2018 10:18 AM, Mason Yang wrote: >> > Document the bindings used by the Renesas R-Car Gen3 RPC SPI controller. >> >> RPC is SPI and HF controller, it is not a pure SPI controller. >> >> How does this deal with the HF part ? Keep in mind the bindings are ABI >> and it will be difficult to redo them later. > > After checking HF datasheet, > 512_MBIT_256_MBIT_128_MBIT_HYPERFLASH_FAMILY_Datasheet.pdf. > > > > From my point of view, > HyperFlash is a kind of standard NOR Flash with high-speed SPI interface. > But I might be wrong. It behaves as a Parallel CFI NOR internally, and so it fits and works with the CFI NOR drivers (see the U-Boot driver), except the interface between the HF controller and the chip is custom. It's not SPI per-se. -- Best regards, Marek Vasut