linux-kernel - Re: Sense of soc bus? (was: [PATCH] base: soc: Export soc_device_to

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Date:   Mon, 18 Nov 2019 07:55:39 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Andreas Färber <afaerber@...e.de>,
        Neil Armstrong <narmstrong@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-realtek-soc@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        NXP Linux Team <linux-imx@....com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        boot-architecture@...ts.linaro.org,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        "open list:TI ETHERNET SWITCH DRIVER (CPSW)" 
        <linux-omap@...r.kernel.org>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: Sense of soc bus? (was: [PATCH] base: soc: Export
 soc_device_to_device() helper)

* Geert Uytterhoeven <geert@...ux-m68k.org> [191115 15:51]:
> On Fri, Nov 15, 2019 at 1:01 PM Andreas Färber <afaerber@...e.de> wrote:
> > Am 15.11.19 um 09:58 schrieb Geert Uytterhoeven:
> > > We do our best to use it solely for detecting quirks in early SoC revisions.
> >
> > Got a pointer? I fail to immediately understand how sysfs would help
> > drivers (as opposed to userspace) detect quirks: Parsing strings back
> > doesn't sound efficient, and I don't see you exporting any custom APIs
> > in drivers/soc/renesas/renesas-soc.c?
> 
> We use soc_device_match(), inside kernel drivers.
> Exposure through sysfs is a side-effect of using soc_device_register(),
> and welcomed, as it allows the user to find out quickly which SoC and
> revision is being used.

For the omap variants too, we've so far gotten away with early SoC
detection for platform code, and then use soc_device_match() in few
cases for drivers at probe time if needed.

Regards,

Tony