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[85.4.92.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490c1e20b0asm13827345e9.1.2026.06.04.15.37.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 Jun 2026 15:37:47 -0700 (PDT) Message-ID: <36c392676bc5cd69de5e8ca2cabe5ccbbced7517.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 Cc: Paul Kocialkowski , linux-sunxi@lists.linux.dev, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Date: Fri, 05 Jun 2026 00:37:40 +0200 In-Reply-To: <20260518235432.07537260@ryzen.lan> References: <20260510201644.4143710-1-alexander.sverdlin@gmail.com> <20260510201644.4143710-4-alexander.sverdlin@gmail.com> <04da68168f92b196cce4d49c766fc62702bf6472.camel@gmail.com> <20260518235432.07537260@ryzen.lan> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260604_153751_254504_1827F308 X-CRM114-Status: GOOD ( 12.52 ) 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 Hi Andre, On Mon, 2026-05-18 at 23:54 +0200, Andre Przywara wrote: > > > > +®_dcdc2 { > > > > + regulator-always-on; > > > > + regulator-min-microvolt =3D <500000>; > > > > + regulator-max-microvolt =3D <1300000>;=C2=A0=20 > > >=20 > > > Should be: > > > =C2=A0 regulator-min-microvolt =3D <900000>; > > > =C2=A0 regulator-max-microvolt =3D <1300000>;=C2=A0=20 > >=20 > > 0.81..1.2v according to A133 Datasheet Revision 1.1 Jul.14, 2020? >=20 > Do you have the CPU OPPs for this board? Do they slightly > overclock/over-volt the core? We have seen this for some other boards. > But you could go with the safer 810mV...1200mV range, and we adjust > this when needed. I'm not sure how to interpret this, if it helps, vendor BSP has: root@HelperA133:~# hexdump -Cv /proc/device-tree/opp_l_table/opp@1512000000= / clock-latency-ns name opp-hz opp-microvolt-b0 opp= -microvolt-b1 opp-microvolt-b2 opp-microvolt-b3 =20 root@HelperA133:~# hexdump -Cv /proc/device-tree/opp_l_table/opp@1512000000= /opp-microvolt-b0 00000000 00 12 01 60 |...`| root@HelperA133:~# hexdump -Cv /proc/device-tree/opp_l_table/opp@1512000000= /opp-microvolt-b1 00000000 00 11 3e 10 00 11 3e 10 00 11 65 20 |..>...>...e | root@HelperA133:~# hexdump -Cv /proc/device-tree/opp_l_table/opp@1512000000= /opp-microvolt-b2 00000000 00 10 c8 e0 |....| root@HelperA133:~# hexdump -Cv /proc/device-tree/opp_l_table/opp@1512000000= /opp-microvolt-b3 00000000 00 10 7a c0 |..z.| root@HelperA133:~# hexdump -Cv /proc/device-tree/opp_l_table/compatible=20 00000000 61 6c 6c 77 69 6e 6e 65 72 2c 73 75 6e 35 30 69 |allwinner,sun5= 0i| 00000010 2d 6f 70 65 72 61 74 69 6e 67 2d 70 6f 69 6e 74 |-operating-poi= nt| 00000020 73 00 |s.| At least 1512MHz is possible (but datasheet says 1.6GHz, so probably no ove= rclocking yet). --=20 Alexander Sverdlin.