> -----Original Message-----
> From: Oleksij Rempel [mailto:[email protected]]
> Sent: 2018年7月26日 17:22
> To: Shawn Guo <[email protected]>; Mark Brown <[email protected]>;
> Rafael J. Wysocki <[email protected]>
> Cc: Oleksij Rempel <[email protected]>; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected]; Andrew Morton
> <[email protected]>; Liam Girdwood <[email protected]>;
> Leonard Crestez <[email protected]>; Rob Herring
> <[email protected]>; Mark Rutland <[email protected]>; Michael
> Turquette <[email protected]>; Stephen Boyd
> <[email protected]>; Fabio Estevam <[email protected]>; Russell
> King <[email protected]>; dl-linux-imx <[email protected]>; Robin Gong
> <[email protected]>; A.s. Dong <[email protected]>
> Subject: [PATCH v8 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:
> https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.
> nxp.com%2Fassets%2Fdocuments%2Fdata%2Fen%2Freference-manuals%2FIM
> X6DQRM.pdf&data=02%7C01%7Cyibin.gong%40nxp.com%7C193fd19e3a
> 40416ffa4a08d5f2d9583c%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C1
> %7C636681937661914076&sdata=lICAelYpUh4%2Ft%2Fs7N9mdk2cLQMi
> cHcOqQ07vTOUoyNY%3D&reserved=0
> page 5083
>
> This patch implements step 4. of this sequence.
>
> Signed-off-by: Oleksij Rempel <[email protected]>
> ---
> 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);
'syscon-poweroff' and 'pmic-stby-poweroff ' should be chosen as a single
Poweroff way for any i.mx6 board. Why not delete directly 'syscon-poweroff' in
dts
to avoid such two power off ways coexist?
> + 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)
> --
> 2.18.0
