linux-kernel - RE: [PATCH v2 4/4] power: reset: Add new driver for RZ/V2M PWC poweroff

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <TYWPR01MB87751FA389AD31380F625501C2FA9@TYWPR01MB8775.jpnprd01.prod.outlook.com>
Date:   Thu, 5 Jan 2023 17:33:43 +0000
From:   Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
CC:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Reichel <sre@...nel.org>, Lee Jones <lee@...nel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: RE: [PATCH v2 4/4] power: reset: Add new driver for RZ/V2M PWC
 poweroff

Hi Geert,

Thanks for your feedback!

> 
> Hi Fabrizio,
> 
> On Wed, Dec 21, 2022 at 10:09 PM Fabrizio Castro
> <fabrizio.castro.jz@...esas.com> wrote:
> > The RZ/V2M PWC IP controls external power supplies and therefore
> > can turn the power supplies off when powering down the system.
> >
> > Add driver to poweroff the system.
> >
> > Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
> > ---
> >
> > v1->v2: Dropped OF match table and syscon as a result of the change in
> >         DT model
> 
> Thanks for your patch!
> 
> > --- /dev/null
> > +++ b/drivers/power/reset/rzv2m-pwc-poweroff.c
> > @@ -0,0 +1,67 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * Copyright (C) 2022 Renesas Electronics Corporation
> > + *
> > + * Reset driver for Renesas RZ/V2M External Power Sequence Controller
> (PWC)
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/io.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/reboot.h>
> > +#include "../../mfd/rzv2m-pwc.h"
> > +
> > +#define PWC_PWCRST_RSTSOFTAX           0x1
> > +#define PWC_PWCCKEN_ENGCKMAIN          0x1
> > +#define PWC_PWCCTL_PWOFF               0x1
> > +
> > +struct rzv2m_pwc_poweroff_priv {
> > +       void __iomem *base;
> > +       struct device *dev;
> > +};
> > +
> > +static int rzv2m_pwc_poweroff(struct sys_off_data *data)
> > +{
> > +       struct rzv2m_pwc_poweroff_priv *priv =
> > +               (struct rzv2m_pwc_poweroff_priv *)data->cb_data;
> 
> No need for this cast.

Thanks for pointing this out. I'll fix that in v3.

Thanks,
Fab

> 
> > +
> > +       writel(PWC_PWCRST_RSTSOFTAX, priv->base + PWC_PWCRST);
> > +       writel(PWC_PWCCKEN_ENGCKMAIN, priv->base + PWC_PWCCKEN);
> > +       writel(PWC_PWCCTL_PWOFF, priv->base + PWC_PWCCTL);
> > +
> > +       mdelay(150);
> > +
> > +       dev_err(priv->dev, "Failed to power off the system");
> > +
> > +       return NOTIFY_DONE;
> > +}
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-
> m68k.org
> 
> In personal conversations with technical people, I call myself a hacker.
> But
> when I'm talking to journalists I just say "programmer" or something like
> that.
>                                 -- Linus Torvalds