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[176.150.251.154]) by smtp.gmail.com with ESMTPSA id u14sm4991785wrr.42.2019.03.16.07.46.04 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 16 Mar 2019 07:46:04 -0700 (PDT) Message-ID: <5C8D0C2B.2010605@baylibre.com> Date: Sat, 16 Mar 2019 15:46:03 +0100 From: Neil Armstrong User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Martin Blumenstingl Subject: Re: [PATCH 11/11] arm64: dts: meson-g12a-x96-max: Enable USB References: <20190311095613.11371-1-narmstrong@baylibre.com> <20190311095613.11371-12-narmstrong@baylibre.com> In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190316_074607_065094_1190C039 X-CRM114-Status: GOOD ( 10.50 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: khilman@baylibre.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org Content-Type: text/plain; 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[176.150.251.154]) by smtp.gmail.com with ESMTPSA id u14sm4991785wrr.42.2019.03.16.07.46.04 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 16 Mar 2019 07:46:04 -0700 (PDT) Message-ID: <5C8D0C2B.2010605@baylibre.com> Date: Sat, 16 Mar 2019 15:46:03 +0100 From: Neil Armstrong User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Martin Blumenstingl CC: khilman@baylibre.com, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 11/11] arm64: dts: meson-g12a-x96-max: Enable USB References: <20190311095613.11371-1-narmstrong@baylibre.com> <20190311095613.11371-12-narmstrong@baylibre.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 15/03/2019 22:50, Martin Blumenstingl a écrit : > Hi Neil, > > On Mon, Mar 11, 2019 at 10:58 AM Neil Armstrong wrote: > [...] >> +&dwc2 { >> + status = "okay"; >> +}; > your patch description states that this enables the "USB host ports" > but dwc2 is only used for peripheral mode (meaning: dr_mode = > "peripheral" or dr_mode = "otg"). > do we still need to enable dwc2 in a host-only configuration? DWC2 is peripheral-only, but we can still manually switch one of the ports and use it as peripheral with a Type-A to Type-A cable, thus enabling dwc2. If the OTG capable PHYs was behind an USB Hub or directly connected to a device, we could disable dwc2, but for now this port is always tied to a physical Type-A or micro-USB connector. Maybe it would be sane to always enable dwc2, and disable it for specific boards only. Neil > > > Regards > Martin >