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Date: Thu, 17 May 2018 07:50:10 +0200 From: Oleksij Rempel <o.rempel@...gutronix.de> To: Shawn Guo <shawnguo@...nel.org>, Mark Brown <broonie@...nel.org>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com> Cc: Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Liam Girdwood <lgirdwood@...il.com>, Leonard Crestez <leonard.crestez@....com>, Rob Herring <robh+dt@...nel.org>, Mark Rutland <mark.rutland@....com>, Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...eaurora.org>, Fabio Estevam <fabio.estevam@....com>, Russell King <linux@...linux.org.uk> Subject: [PATCH v7 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set One of the Freescale recommended sequences for power off with external PMIC is the following: ... 3. SoC is programming PMIC for power off when standby is asserted. 4. In CCM STOP mode, Standby is asserted, PMIC gates SoC supplies. See: http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6DQRM.pdf page 5083 This patch implements step 4. of this sequence. Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de> --- arch/arm/mach-imx/pm-imx6.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c index 017539dd712b..2f5c643f62fb 100644 --- a/arch/arm/mach-imx/pm-imx6.c +++ b/arch/arm/mach-imx/pm-imx6.c @@ -601,6 +601,28 @@ static void __init imx6_pm_common_init(const struct imx6_pm_socdata IMX6Q_GPR1_GINT); } +static void imx6_pm_stby_poweroff(void) +{ + imx6_set_lpm(STOP_POWER_OFF); + imx6q_suspend_finish(0); + + mdelay(1000); + + pr_emerg("Unable to poweroff system\n"); +} + +static int imx6_pm_stby_poweroff_probe(void) +{ + if (pm_power_off) { + pr_warn("%s: pm_power_off already claimed %p %pf!\n", + __func__, pm_power_off, pm_power_off); + return -EBUSY; + } + + pm_power_off = imx6_pm_stby_poweroff; + return 0; +} + void __init imx6_pm_ccm_init(const char *ccm_compat) { struct device_node *np; @@ -617,6 +639,9 @@ void __init imx6_pm_ccm_init(const char *ccm_compat) val = readl_relaxed(ccm_base + CLPCR); val &= ~BM_CLPCR_LPM; writel_relaxed(val, ccm_base + CLPCR); + + if (of_property_read_bool(np, "fsl,pmic-stby-poweroff")) + imx6_pm_stby_poweroff_probe(); } void __init imx6q_pm_init(void) -- 2.17.0
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