Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20200214062637.216209-1-evanbenn@chromium.org>
 <20200214172512.2.I7c8247c29891a538f258cb47828d58acf22c95a2@changeid> <804d3cc5-688d-7025-cb87-10b9616f4d9b@roeck-us.net>
In-Reply-To: <804d3cc5-688d-7025-cb87-10b9616f4d9b@roeck-us.net>
From:   Evan Benn <evanbenn@chromium.org>
Date:   Thu, 20 Feb 2020 17:50:03 +1100
Message-ID: <CAKz_xw0fHgVBLdEoEoQ7OSAgBcvYBAowV0obWLsDUGNPotP55Q@mail.gmail.com>
Subject: Re: [PATCH 2/2] watchdog: Add new arm_smc_wdt watchdog driver
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Julius Werner <jwerner@chromium.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Olof Johansson <olof@lixom.net>,
        Leonard Crestez <leonard.crestez@nxp.com>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Dinh Nguyen <dinguyen@kernel.org>,
        linux-arm-kernel@lists.infradead.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Will Deacon <will@kernel.org>, linux-watchdog@vger.kernel.org,
        Rob Herring <robh@kernel.org>,
        Wim Van Sebroeck <wim@linux-watchdog.org>,
        =?UTF-8?B?Q2zDqW1lbnQgUMOpcm9u?= <peron.clem@gmail.com>,
        Shawn Guo <shawnguo@kernel.org>,
        "David S. Miller" <davem@davemloft.net>,
        Anson Huang <Anson.Huang@nxp.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

> > +     if ((int)res->a0 == PSCI_RET_NOT_SUPPORTED)
> > +             return -ENOTSUPP;
>
> -ENODEV would be better here.
>
> > +     if ((int)res->a0 == PSCI_RET_INVALID_PARAMS)
> > +             return -EINVAL;
> > +     if ((int)res->a0 < 0)
> > +             return -EIO;

In fixing this I found drivers/firmware/psci/psci.c:145
Which also translates psci codes to errno codes, but uses EOPNOTSUPP:

    switch (errno) {
    case PSCI_RET_SUCCESS:
        return 0;
    case PSCI_RET_NOT_SUPPORTED:
        return -EOPNOTSUPP;
    case PSCI_RET_INVALID_PARAMS:
    case PSCI_RET_INVALID_ADDRESS:
        return -EINVAL;
    case PSCI_RET_DENIED:
        return -EPERM;
    };

    return -EINVAL;

Are these more appropriate?

Evan