From: Linus Walleij <linus.walleij@linaro.org>
To: Benjamin GAIGNARD <benjamin.gaignard@st.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Loic PALLARDY <loic.pallardy@st.com>,
"arnd@arndb.de" <arnd@arndb.de>,
"robh@kernel.org" <robh@kernel.org>,
Greg KH <gregkh@linuxfoundation.org>,
"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"broonie@kernel.org" <broonie@kernel.org>,
"lkml@metux.net" <lkml@metux.net>,
"linux-imx@nxp.com" <linux-imx@nxp.com>,
"kernel@pengutronix.de" <kernel@pengutronix.de>,
"sudeep.holla@arm.com" <sudeep.holla@arm.com>,
"fabio.estevam@nxp.com" <fabio.estevam@nxp.com>,
"shawnguo@kernel.org" <shawnguo@kernel.org>,
"stefano.stabellini@xilinx.com" <stefano.stabellini@xilinx.com>,
"system-dt@lists.openampproject.org"
<system-dt@lists.openampproject.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v2 2/7] bus: Introduce firewall controller framework
Date: Wed, 29 Jan 2020 10:42:39 +0100 [thread overview]
Message-ID: <CACRpkdY427EzpAt7f5wwqHpRS_SHM8Fvm+cFrwY8op0E_J+D9Q@mail.gmail.com> (raw)
In-Reply-To: <62b38576-0e1a-e30e-a954-a8b6a7d8d897@st.com>
On Tue, Jan 28, 2020 at 9:30 PM Benjamin GAIGNARD
<benjamin.gaignard@st.com> wrote:
> On 1/28/20 5:57 PM, Greg KH wrote:
> > On Tue, Jan 28, 2020 at 04:41:29PM +0000, Benjamin GAIGNARD wrote:
> >> On 1/28/20 4:52 PM, Greg KH wrote:
> >>> So put this in the bus-specific code that controls the bus that these
> >>> devices live on. Why put it in the driver core when this is only on one
> >>> "bus" (i.e. the catch-all-and-a-bag-of-chips platform bus)?
> >> It is really similar to what pin controller does, configuring an
> >> hardware block given DT information.
> > Great, then use that instead :)
> I think that Linus W. will complain if I do that :)
So the similarity would be something like the way that pin control
states are configured in the device tree and the pin control
handles are taken before probe in drivers/base/pinctrl.c embedding
a hook into dd.c.
Not that it in any way controls any hardware even remotely
similar to pin control. Pin control is an electronic thing,
this firewalling is about bus access.
IIUC this framework wants to discover at kernel boot time
whether certain devices are accessible to it or not by inspecting
the state of the firewalling hardware and then avoid probing
those that are inaccessible.
It needs the same deep hooks into dd.c to achieve this
I believe.
Yours,
Linus Walleij
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next prev parent reply other threads:[~2020-01-29 9:43 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-28 15:37 [PATCH v2 0/7] Introduce bus firewall controller framework Benjamin Gaignard
2020-01-28 15:38 ` [PATCH v2 1/7] dt-bindings: bus: Add firewall bindings Benjamin Gaignard
2020-01-28 15:38 ` [PATCH v2 2/7] bus: Introduce firewall controller framework Benjamin Gaignard
2020-01-28 15:52 ` Greg KH
2020-01-28 16:41 ` Benjamin GAIGNARD
2020-01-28 16:57 ` Greg KH
2020-01-28 20:29 ` Benjamin GAIGNARD
2020-01-29 5:49 ` Greg KH
2020-01-29 9:42 ` Linus Walleij [this message]
2020-01-29 9:52 ` Greg KH
2020-01-29 11:17 ` Mark Brown
2020-01-31 8:37 ` Benjamin GAIGNARD
2020-01-31 9:06 ` Greg KH
2020-02-14 16:05 ` Linus Walleij
2020-02-14 21:40 ` Greg KH
2020-02-15 12:41 ` Benjamin GAIGNARD
2020-02-16 7:21 ` Greg KH
2020-01-28 15:38 ` [PATCH v2 3/7] base: Add calls to firewall controller Benjamin Gaignard
2020-01-28 15:38 ` [PATCH v2 4/7] dt-bindings: bus: Add STM32 ETZPC " Benjamin Gaignard
2020-01-28 15:38 ` [PATCH v2 5/7] bus: firewall: Add driver for STM32 ETZPC controller Benjamin Gaignard
2020-01-28 15:38 ` [PATCH v2 6/7] ARM: dts: stm32: Add firewall node for stm32mp157 SoC Benjamin Gaignard
2020-01-28 15:38 ` [PATCH v2 7/7] ARM: dts: stm32: enable firewall controller node on stm32mp157c-ed1 Benjamin Gaignard
2020-01-28 16:36 ` [PATCH v2 0/7] Introduce bus firewall controller framework Sudeep Holla
2020-01-28 16:46 ` Benjamin GAIGNARD
2020-01-28 17:17 ` Sudeep Holla
2020-01-28 20:06 ` Benjamin GAIGNARD
2020-01-28 22:06 ` Robin Murphy
2020-01-29 13:40 ` Benjamin GAIGNARD
2020-01-31 18:25 ` Robin Murphy
2020-02-03 13:16 ` Benjamin GAIGNARD
2020-01-31 20:51 ` Florian Fainelli
2020-02-03 13:41 ` Benjamin GAIGNARD
2020-01-31 20:48 ` Florian Fainelli
2020-02-02 12:23 ` Mark Brown
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