From: Mark Rutland <mark.rutland@arm.com>
To: Neil Armstrong <narmstrong@baylibre.com>
Cc: khilman@baylibre.com, carlo@caione.org, a.zummo@towertech.it,
alexandre.belloni@free-electrons.com,
linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, rtc-linux@googlegroups.com
Subject: Re: [RFC PATCH 0/3] ARM64: meson-gxbb: Add support for system suspend
Date: Thu, 3 Nov 2016 15:25:46 +0000 [thread overview]
Message-ID: <20161103152545.GB25852@remoulade> (raw)
In-Reply-To: <1478183365-23708-1-git-send-email-narmstrong@baylibre.com>
On Thu, Nov 03, 2016 at 03:29:22PM +0100, Neil Armstrong wrote:
> Thie patchset is a very experiment patchset to support the System Suspend
> feature of the Amlogic Meson GX SoCs.
>
> These SoCs implements system suspend using a non-standard PSCI CPU_SUSPEND
> parameter to enter system suspend.
This sounds like a violation of the CPU_SUSPEND semantics.
> A small driver is added to properly fill the platform_suspend_ops and make
> to correct SMC call.
Ignoring the fact that this is a blatant violation of the PSCI CPU_SUSPEND
semantics, this certainly should not be a separate driver.
> In order to wake up from an alarm, these SoCs have a special memory mapped
> register where an alarm time delay in seconds is stored.
> In order to reuse the RTC wakealarm feature, implement a fake RTC device
> that uses the system time to calculate a delay to write to the register.
>
> Note that this RFC is here to seek a better way to handle these platform
> specific features.
>
> Neil Armstrong (3):
> ARM64: meson: Add Amlogic Meson GX PM Suspend
> rtc: Add Amlogic Virtual Wake RTC
> ARM64: dts: meson-gxbb: Add support for PM and Virtual RTC
>
> arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 9 ++
> drivers/firmware/meson/Kconfig | 6 +
> drivers/firmware/meson/Makefile | 1 +
> drivers/firmware/meson/meson_gx_pm.c | 86 +++++++++++++++
> drivers/rtc/Kconfig | 10 ++
> drivers/rtc/Makefile | 1 +
> drivers/rtc/rtc-meson-vrtc.c | 164 ++++++++++++++++++++++++++++
> 7 files changed, 277 insertions(+)
> create mode 100644 drivers/firmware/meson/meson_gx_pm.c
> create mode 100644 drivers/rtc/rtc-meson-vrtc.c
>
> --
> 1.9.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2016-11-03 15:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-03 14:29 [RFC PATCH 0/3] ARM64: meson-gxbb: Add support for system suspend Neil Armstrong
2016-11-03 14:29 ` [RFC PATCH 1/3] ARM64: meson: Add Amlogic Meson GX PM Suspend Neil Armstrong
2016-11-03 15:30 ` Mark Rutland
2016-11-03 21:53 ` Sudeep Holla
2016-11-04 9:13 ` Neil Armstrong
2016-11-03 14:29 ` [RFC PATCH 2/3] rtc: Add Amlogic Virtual Wake RTC Neil Armstrong
2016-11-03 15:36 ` Mark Rutland
2016-11-03 15:46 ` Neil Armstrong
2016-12-01 0:51 ` [rtc-linux] " Alexandre Belloni
2016-11-03 14:29 ` [RFC PATCH 3/3] ARM64: dts: meson-gxbb: Add support for PM and Virtual RTC Neil Armstrong
2016-11-03 15:25 ` Mark Rutland [this message]
2016-11-03 15:43 ` [RFC PATCH 0/3] ARM64: meson-gxbb: Add support for system suspend Mark Rutland
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