linux-kernel - RE: [PATCH v6] soc: fsl: enable acpi support in RCPM driver

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Date:   Wed, 7 Apr 2021 01:31:38 +0000
From:   Ran Wang <ran.wang_1@....com>
To:     Leo Li <leoyang.li@....com>
CC:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6] soc: fsl: enable acpi support in RCPM driver

Hi Leo,

On Wednesday, April 7, 2021 5:45 AM, Li Yang wrote:
> 
> On Fri, Mar 12, 2021 at 2:56 AM Ran Wang <ran.wang_1@....com> wrote:
> >
> > From: Peng Ma <peng.ma@....com>
> >
> > This patch enables ACPI support in RCPM driver.
> >
> > Signed-off-by: Peng Ma <peng.ma@....com>
> > Signed-off-by: Ran Wang <ran.wang_1@....com>
> > ---
> > Change in v6:
> >  - Remove copyright udpate to rebase on latest mainline
> >
> > Change in v5:
> >  - Fix panic when dev->of_node is null
> >
> > Change in v4:
> >  - Make commit subject more accurate
> >  - Remove unrelated new blank line
> >
> > Change in v3:
> >  - Add #ifdef CONFIG_ACPI for acpi_device_id
> >  - Rename rcpm_acpi_imx_ids to rcpm_acpi_ids
> >
> > Change in v2:
> >  - Update acpi_device_id to fix conflict with other driver
> >
> >  drivers/soc/fsl/rcpm.c | 18 ++++++++++++++++--
> >  1 file changed, 16 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/soc/fsl/rcpm.c b/drivers/soc/fsl/rcpm.c index
> > 4ace28cab314..7aa997b932d1 100644
> > --- a/drivers/soc/fsl/rcpm.c
> > +++ b/drivers/soc/fsl/rcpm.c
> > @@ -13,6 +13,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/suspend.h>
> >  #include <linux/kernel.h>
> > +#include <linux/acpi.h>
> >
> >  #define RCPM_WAKEUP_CELL_MAX_SIZE      7
> >
> > @@ -78,10 +79,14 @@ static int rcpm_pm_prepare(struct device *dev)
> >                                 "fsl,rcpm-wakeup", value,
> >                                 rcpm->wakeup_cells + 1);
> >
> > -               /*  Wakeup source should refer to current rcpm device */
> > -               if (ret || (np->phandle != value[0]))
> > +               if (ret)
> >                         continue;
> >
> > +               if (is_of_node(dev->fwnode))
> > +                       /*  Should refer to current rcpm device */
> > +                       if (np->phandle != value[0])
> > +                               continue;
> 
> It looks like that we assume that in the ACPI scenario there will only be one RCPM controller and all devices are controlled by this single
> PM controller.  This probably is true for all existing SoCs with a RCPM.  But since the driver tried to support multiple RCPMs, maybe we
> should continue to support multiple RCPM controllers or at least mention that in the comment.

How about adding some comment as below:

/* For ACPI mode, currently we assume there is only one RCPM controller existing */

Regards,
Ran

> 
> > +
> >                 /* Property "#fsl,rcpm-wakeup-cells" of rcpm node defines the
> >                  * number of IPPDEXPCR register cells, and "fsl,rcpm-wakeup"
> >                  * of wakeup source IP contains an integer array:
> > <phandle to @@ -172,10 +177,19 @@ static const struct of_device_id
> > rcpm_of_match[] = {  };  MODULE_DEVICE_TABLE(of, rcpm_of_match);
> >
> > +#ifdef CONFIG_ACPI
> > +static const struct acpi_device_id rcpm_acpi_ids[] = {
> > +       {"NXP0015",},
> > +       { }
> > +};
> > +MODULE_DEVICE_TABLE(acpi, rcpm_acpi_ids); #endif
> > +
> >  static struct platform_driver rcpm_driver = {
> >         .driver = {
> >                 .name = "rcpm",
> >                 .of_match_table = rcpm_of_match,
> > +               .acpi_match_table = ACPI_PTR(rcpm_acpi_ids),
> >                 .pm     = &rcpm_pm_ops,
> >         },
> >         .probe = rcpm_probe,
> > --
> > 2.25.1
> >