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[85.4.92.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48feb00e5easm80885505e9.13.2026.05.18.04.29.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 04:29:52 -0700 (PDT) Message-ID: <6d8659f393e0bb4f0805107a17e306422982247c.camel@gmail.com> Subject: Re: [PATCH v2 3/3] arm64: dts: allwinner: A133: add support for Baijie Helper A133 board From: Alexander Sverdlin To: Andre Przywara , linux-sunxi@lists.linux.dev Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Date: Mon, 18 May 2026 13:29:51 +0200 In-Reply-To: <256b1cd8-b143-4f71-91cc-8513be04ce4c@arm.com> References: <20260510201644.4143710-1-alexander.sverdlin@gmail.com> <20260510201644.4143710-4-alexander.sverdlin@gmail.com> <2306dd3c-6362-40ee-8d9f-77f89be3a502@arm.com> <14a7e289ff5ffed8fcd6dcb9b2e8455a1b2c9420.camel@gmail.com> <256b1cd8-b143-4f71-91cc-8513be04ce4c@arm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Hi Andre, On Mon, 2026-05-18 at 13:16 +0200, Andre Przywara wrote: > > > And anyway, I see a *dual* USB-A socket on the pictures online, in > > > addition to the USB-OTG port. So where does the third USB come from? = The > > > A133 only supports one host USB port plus the one OTG port. So is the= re > > > an USB hub chip on the board? > >=20 > > There are two hubs, one on each usbphy. OTG side hub is even bus-powere= d, >=20 > What do you mean with OTG side hub, exactly? Is there a hub on USB0? How= =20 > does this work, then? the upstream port of this hub is wired to the USB-C connector, one port has CH340E USB-UART on it for the console, the other port goes to the SoC usbph= y 0. So it would be "peripheral" only, I suppose. --=20 Alexander Sverdlin.