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Sun, 24 Mar 2019 20:43:58 -0500 Received: from DLEE105.ent.ti.com (157.170.170.35) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Sun, 24 Mar 2019 20:43:57 -0500 Received: from dflp33.itg.ti.com (10.64.6.16) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5 via Frontend Transport; Sun, 24 Mar 2019 20:43:57 -0500 Received: from [172.22.217.24] (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id x2P1hr2Q012161; Sun, 24 Mar 2019 20:43:54 -0500 Subject: Re: [PATCH 0/5] AM437x: Add rtc-only + DDR mode support To: Russell King - ARM Linux admin References: <20190322171619.4180-1-j-keerthy@ti.com> <20190322183253.w2uuhglttwmmxfnx@shell.armlinux.org.uk> From: keerthy Message-ID: <1fadeed8-b091-43c8-e7ec-f29ad0fff82c@ti.com> Date: Mon, 25 Mar 2019 07:13:53 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: <20190322183253.w2uuhglttwmmxfnx@shell.armlinux.org.uk> Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190324_184416_356162_94EC5385 X-CRM114-Status: GOOD ( 19.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-rtc@vger.kernel.org, a.zummo@towertech.it, alexandre.belloni@bootlin.com, d-gerlach@ti.com, tony@atomide.com, t-kristo@ti.com, ssantosh@kernel.org, linux-omap@vger.kernel.org, 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+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 3/23/2019 12:02 AM, Russell King - ARM Linux admin wrote: > On Fri, Mar 22, 2019 at 10:46:14PM +0530, Keerthy wrote: >> RTC plus DDR in self-refresh is power a saving mode where in the entire > "a power" ? Will correct the above typo. > >> system including the different voltage rails from PMIC are shutdown except >> the ones feeding on to RTC and DDR. DDR is kept in self-refresh hence the As explained above All the voltage rails of PMIC are shut off except for RTC and DDR Rails. >> contents are preserved. RTC ALARM2 is connected to PMIC_EN line once >> we the ALARM2 is triggered we enter the mode with DDR in self-refresh > > Doesn't make sense. > >> and RTC Ticking. After a predetermined time an RTC ALARM1 triggers waking >> up the system. > > Huh, you start off explaining the wiring above... how does RTC ALARM1 > trigger waking up the system if RTC ALARM2 is connected to the PMIC > and all other power is shut down? The entire PMIC is shutdown but for RTC rail. RTC is a separate voltage domain and is powered up during this power save mode. http://www.ti.com/lit/ug/spruhl7h/spruhl7h.pdf Page 2884. > >> The control goes to bootloader. The bootloader then checks >> RTC scratchpad registers to confirm it was an rtc_only wakeup and follows >> a different path, configure bare minimal clocks for ddr and then jumps to >> the resume address in another RTC scratchpad registers and transfers the >> control to Kernel. Kernel then restores the saved context. >> >> The patch series adds rtc-only + DDR mode support am am437x >> Tested DS0, rtc+ddr back and forth on am437x-gp-evm board. >> >> This mode works only with u-boot built with am43xx_evm_rtconly_defconfig >> >> Additional patch is needed for omap-gpio save restore which will >> come as fixes later. >> >> Keerthy (5): >> rtc: OMAP: Add support for rtc-only mode >> rtc: interface: Add power_off_program to rtc_class_ops >> arm: mach-omap2: pm33xx: Add support for rtc+ddr in self refresh mode >> soc: ti: pm33xx: Push the am33xx_push_sram_idle to the top >> soc: ti: pm33xx: AM437X: Add rtc_only with ddr in self-refresh support >> >> arch/arm/mach-omap2/pm33xx-core.c | 76 +++++++- >> drivers/rtc/interface.c | 12 ++ >> drivers/rtc/rtc-omap.c | 49 ++++- >> drivers/soc/ti/Kconfig | 5 +- >> drivers/soc/ti/pm33xx.c | 272 ++++++++++++++++++++++----- >> include/linux/platform_data/pm33xx.h | 5 + >> include/linux/rtc.h | 2 + >> 7 files changed, 360 insertions(+), 61 deletions(-) >> >> -- >> 2.17.1 >> >> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel >> > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel