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
In-Reply-To: <20180511162028.20616-11-brgl@bgdev.pl>
References: <20180511162028.20616-1-brgl@bgdev.pl> <20180511162028.20616-11-brgl@bgdev.pl>
From:   Rob Herring <robh+dt@kernel.org>
Date:   Mon, 14 May 2018 08:37:24 -0500
Message-ID: <CAL_JsqJw8UXktcLK8ADUfo1P+1un+omJ31sGcq7GFbNwJMsHKg@mail.gmail.com>
Subject: Re: [PATCH 10/12] platform/early: implement support for early
 platform drivers
To:     Bartosz Golaszewski <brgl@bgdev.pl>
Cc:     Sekhar Nori <nsekhar@ti.com>, Kevin Hilman <khilman@kernel.org>,
        David Lechner <david@lechnology.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Marc Zyngier <marc.zyngier@arm.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Peter Rosin <peda@axentia.se>, Jiri Slaby <jslaby@suse.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Magnus Damm <magnus.damm@gmail.com>,
        Johan Hovold <johan@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        devicetree@vger.kernel.org,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@vger.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Fri, May 11, 2018 at 11:20 AM, Bartosz Golaszewski <brgl@bgdev.pl> wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> This introduces the core part of support for early platform drivers
> and devices.
>

It looks like most of your prep patches are to separate the alloc and
init of platform devices because you are essentially making early
devices/drivers a sub-class. Maybe you could avoid doing that and
simplify things a bit. Comments below based on doing that...

> +/**
> + * struct early_platform_driver
> + *
> + * @pdrv: real platform driver associated with this early platform driver
> + * @list: list head for the list of early platform drivers
> + * @early_probe: early probe callback
> + */
> +struct early_platform_driver {
> +       struct platform_driver pdrv;
> +       struct list_head list;

Couldn't you use an existing list in driver_private until you move
over to the normal bus infra.

> +       int (*early_probe)(struct platform_device *);

Just add this to platform_driver.

> +};
> +
> +/**
> + * struct early_platform_device
> + *
> + * @pdev: real platform device associated with this early platform device
> + * @list: list head for the list of early platform devices
> + * @deferred: true if this device's early probe was deferred
> + * @deferred_drv: early platform driver with which this device was matched
> + */
> +struct early_platform_device {
> +       struct platform_device pdev;
> +       struct list_head list;

Use a list in device_private?

> +       bool deferred;
> +       struct early_platform_driver *deferred_drv;

Can't you use the existing deferred probe list?

Rob