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[86.49.110.70]) by smtp.gmail.com with ESMTPSA id r12sm21413531wrt.95.2019.06.18.05.01.40 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Tue, 18 Jun 2019 05:01:41 -0700 (PDT) Subject: Re: [PATCH v13 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3 RPC-IF controller bindings To: masonccyang@mxic.com.tw, Lee Jones Cc: bbrezillon@kernel.org, broonie@kernel.org, devicetree@vger.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, mark.rutland@arm.com, miquel.raynal@bootlin.com, robh+dt@kernel.org, Sergei Shtylyov References: <1558423174-10748-1-git-send-email-masonccyang@mxic.com.tw> <1558423174-10748-4-git-send-email-masonccyang@mxic.com.tw> <0e2994d6-6efc-9f36-f681-609199f20b9f@cogentembedded.com> <20190603130428.GX4797@dell> <02addf64-9f6e-ccc1-2f94-8983456e3ebc@cogentembedded.com> From: Marek Vasut Openpgp: preference=signencrypt Message-ID: <2671d488-82a1-8720-d9a1-03554d955a38@gmail.com> Date: Tue, 18 Jun 2019 14:01:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/6/19 9:40 AM, masonccyang@mxic.com.tw wrote: [...] > RPC-IF works either in SPI or HyperFlash is decided by external hardware > pins > configuration and it can NOT switch it's operation mode in the run time. > This is not like my understanding of MFD. Which external hardware pins decide the RPC configuration ? It seems to me like PHYCNT register, PHYMEM bitfield, selects what device is connected, and then a couple of other bits control the communication, but I see nothing which would be tied to any external configuration pins. [...] -- Best regards, Marek Vasut