Re: [PATCH v4 2/6] ARM: imx6: register pm_power_off handler if "fsl,pmic-stby-poweroff" is set

From: Shawn Guo
Date: Wed Jun 14 2017 - 23:25:30 EST


+Leonard, in case he wants to have a look.

One small comment below ...

On Fri, Jun 09, 2017 at 04:07:35PM +0200, Oleksij Rempel wrote:
> 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@xxxxxxxxxxxxxx>
> ---
> arch/arm/mach-imx/pm-imx6.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/arch/arm/mach-imx/pm-imx6.c b/arch/arm/mach-imx/pm-imx6.c
> index e61b1d1027e1..3a4f8f289f4d 100644
> --- a/arch/arm/mach-imx/pm-imx6.c
> +++ b/arch/arm/mach-imx/pm-imx6.c
> @@ -27,6 +27,8 @@
> #include <asm/proc-fns.h>
> #include <asm/suspend.h>
> #include <asm/tlb.h>
> +#include <linux/kallsyms.h>
> +#include <linux/regulator/machine.h>

How are these headers used?

Shawn

>
> #include "common.h"
> #include "hardware.h"
> @@ -602,6 +604,28 @@ static void __init imx6_pm_common_init(const struct imx6_pm_socdata
> IMX6Q_GPR1_GINT);
> }
>
> +static void imx6_pm_poweroff(void)
> +{
> + imx6_set_lpm(STOP_POWER_OFF);
> + cpu_suspend(0, imx6q_suspend_finish);
> +
> + mdelay(1000);
> +
> + pr_emerg("Unable to poweroff system\n");
> +}
> +
> +static int imx6_pm_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_poweroff;
> + return 0;
> +}
> +
> void __init imx6_pm_ccm_init(const char *ccm_compat)
> {
> struct device_node *np;
> @@ -618,6 +642,9 @@ 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_poweroff_probe();
> }
>
> void __init imx6q_pm_init(void)
> --
> 2.11.0
>