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Tue, 17 Nov 2020 12:19:41 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id E497810002A; Tue, 17 Nov 2020 12:19:40 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id CDE5E241A55; Tue, 17 Nov 2020 12:19:40 +0100 (CET) Received: from lmecxl0912.lme.st.com (10.75.127.50) by SFHDAG3NODE2.st.com (10.75.127.8) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 17 Nov 2020 12:19:39 +0100 Subject: Re: [PATCH v2 2/2] ARM: dts: stm32: support child mfd cells for the stm32mp1 TAMP syscon To: Ahmad Fatoum , Rob Herring , Maxime Coquelin References: <20201021102855.18026-1-a.fatoum@pengutronix.de> <20201021102855.18026-2-a.fatoum@pengutronix.de> From: Alexandre Torgue Message-ID: <352478be-cd69-2089-baaf-6f796cfc6cfd@st.com> Date: Tue, 17 Nov 2020 12:18:42 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201021102855.18026-2-a.fatoum@pengutronix.de> Content-Language: en-US X-Originating-IP: [10.75.127.50] X-ClientProxiedBy: SFHDAG1NODE2.st.com (10.75.127.2) To SFHDAG3NODE2.st.com (10.75.127.8) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312, 18.0.737 definitions=2020-11-17_03:2020-11-17, 2020-11-17 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201117_061946_261438_24DC6DB5 X-CRM114-Status: GOOD ( 24.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Arnaud Pouliquen , linux-kernel@vger.kernel.org, kernel@pengutronix.de, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Ahmad On 10/21/20 12:28 PM, Ahmad Fatoum wrote: > The stm32mp1 TAMP peripheral has 32 backup registers that survive > a warm reset. This makes them suitable for storing a reboot > mode, which the vendor's kernel tree is already doing[0]. > > The actual syscon-reboot-mode child node can be added by a board.dts or > fixed up by the bootloader. For the child node to be probed, the > compatible needs to include simple-mfd. The binding now specifies this, > so have the SoC dtsi adhere to it. > > [0]: https://github.com/STMicroelectronics/linux/commit/2e9bfc29dd > > Signed-off-by: Ahmad Fatoum > --- > v1 -> v2: > - Dropped simple-bus. simple-mfd is all that's needed > - reworded commit message > --- > arch/arm/boot/dts/stm32mp151.dtsi | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi > index 842ecffae73a..662c2408d41b 100644 > --- a/arch/arm/boot/dts/stm32mp151.dtsi > +++ b/arch/arm/boot/dts/stm32mp151.dtsi > @@ -1542,7 +1542,7 @@ i2c6: i2c@5c009000 { > }; > > tamp: tamp@5c00a000 { > - compatible = "st,stm32-tamp", "syscon"; > + compatible = "st,stm32-tamp", "syscon", "simple-mfd"; > reg = <0x5c00a000 0x400>; > }; > > Series applied on stm32-next. Regards Alex _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel