linux-kernel - Re: [PATCH 10/12] platform/early: implement support for early platform drivers

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Date:   Mon, 14 May 2018 08:37:24 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Marc Zyngier <marc.zyngier@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Peter Rosin <peda@...ntia.se>, Jiri Slaby <jslaby@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 10/12] platform/early: implement support for early
 platform drivers

On Fri, May 11, 2018 at 11:20 AM, Bartosz Golaszewski <brgl@...ev.pl> wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.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