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Mon, 20 Apr 2026 14:22:01 -0700 (PDT) Received: from strix.localnet ([197.250.227.85]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4891b46cffasm125023055e9.13.2026.04.20.14.21.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Apr 2026 14:21:59 -0700 (PDT) From: Stefan =?UTF-8?B?RMO2c2luZ2Vy?= To: Linus Walleij Cc: linux-arm-kernel@lists.infradead.org, Arnd Bergmann , Krzysztof Kozlowski , Rob Herring Subject: Re: [PATCH v3 6/8] ARM: zte: Bring back zx29 UART support Date: Tue, 21 Apr 2026 00:21:51 +0300 Message-ID: <5075672.GXAFRqVoOG@strix> In-Reply-To: References: <20260414211215.152850-1-stefandoesinger@gmail.com> <20260414211215.152850-7-stefandoesinger@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1964088.tdWV9SEqCh"; micalg="pgp-sha256"; protocol="application/pgp-signature" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260420_222204_683118_FCF36965 X-CRM114-Status: GOOD ( 14.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --nextPart1964088.tdWV9SEqCh Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8"; protected-headers="v1" From: Stefan =?UTF-8?B?RMO2c2luZ2Vy?= To: Linus Walleij Subject: Re: [PATCH v3 6/8] ARM: zte: Bring back zx29 UART support Date: Tue, 21 Apr 2026 00:21:51 +0300 Message-ID: <5075672.GXAFRqVoOG@strix> MIME-Version: 1.0 Am Montag, 20. April 2026, 16:00:24 Ostafrikanische Zeit schrieben Sie: > Topic should be prefixed: > "amba/serial: amba-pl011: ..." I'll change it > Interesting with the AMBA pseudo-ID, but I kind of like the idea. It wasn't my idea. That's - as the description says - the code that was once upstream before it got removed in 89d4f98ae90d. This is also why the ZX_UART011_* defines still exist. I re-checked if the device identifies itself in the mmio area in any way, and that I maybe got the size wrong - but that was not the case, everything past the ZX_UART011_* registers is zero until the next device starts. > Things without bit 7 set such as ARMs 0x41 and Qualcomms > 0x51 are kind of cowboy values however. LSI 0xb6 is the only > vendor actually following the standard. > You could use 0x7e. Another idea I considered is using ZTE's 0x8c (assuming that "Microelectronics Institute ZTE" is the same ZTE that made the board), but then I would have to invent a device number, ideally without clashing with an existing ZTE device. Thanks for the review, Stefan --nextPart1964088.tdWV9SEqCh Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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