> -----Original Message----- > From: Greg KH [mailto:gre...@linuxfoundation.org] > Sent: Monday, September 12, 2016 11:17 AM > To: Vadim Pasternak <vad...@mellanox.com> > Cc: t...@linutronix.de; mi...@redhat.com; h...@zytor.com; > da...@davemloft.net; ge...@linux-m68k.org; a...@linux-foundation.org; > kv...@codeaurora.org; mche...@kernel.org; li...@roeck-us.net; > x...@kernel.org; linux-kernel@vger.kernel.org; platform-driver- > x...@vger.kernel.org; j...@resnulli.us > Subject: Re: [patch v1] x86/platform/mellanox: introduce support for Mellanox > systems platform > > On Mon, Sep 12, 2016 at 07:48:24AM +0000, Vadim Pasternak wrote: > > > > > > > -----Original Message----- > > > From: Greg KH [mailto:gre...@linuxfoundation.org] > > > Sent: Monday, September 12, 2016 10:41 AM > > > To: Vadim Pasternak <vad...@mellanox.com> > > > Cc: t...@linutronix.de; mi...@redhat.com; h...@zytor.com; > > > da...@davemloft.net; ge...@linux-m68k.org; > > > a...@linux-foundation.org; kv...@codeaurora.org; mche...@kernel.org; > > > li...@roeck-us.net; x...@kernel.org; linux-kernel@vger.kernel.org; > > > platform-driver- x...@vger.kernel.org; j...@resnulli.us > > > Subject: Re: [patch v1] x86/platform/mellanox: introduce support for > > > Mellanox systems platform > > > > > > On Mon, Sep 12, 2016 at 07:23:59AM +0000, Vadim Pasternak wrote: > > > > > > > > > > > > > -----Original Message----- > > > > > From: Greg KH [mailto:gre...@linuxfoundation.org] > > > > > Sent: Monday, September 12, 2016 10:05 AM > > > > > To: Vadim Pasternak <vad...@mellanox.com> > > > > > Cc: t...@linutronix.de; mi...@redhat.com; h...@zytor.com; > > > > > da...@davemloft.net; ge...@linux-m68k.org; > > > > > a...@linux-foundation.org; kv...@codeaurora.org; > > > > > mche...@kernel.org; li...@roeck-us.net; x...@kernel.org; > > > > > linux-kernel@vger.kernel.org; > > > > > platform-driver- x...@vger.kernel.org; j...@resnulli.us > > > > > Subject: Re: [patch v1] x86/platform/mellanox: introduce support > > > > > for Mellanox systems platform > > > > > > > > > > On Mon, Sep 12, 2016 at 06:44:03AM +0000, Vadim Pasternak wrote: > > > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > > From: Greg KH [mailto:gre...@linuxfoundation.org] > > > > > > > Sent: Monday, September 12, 2016 9:13 AM > > > > > > > To: Vadim Pasternak <vad...@mellanox.com> > > > > > > > Cc: t...@linutronix.de; mi...@redhat.com; h...@zytor.com; > > > > > > > da...@davemloft.net; ge...@linux-m68k.org; > > > > > > > a...@linux-foundation.org; kv...@codeaurora.org; > > > > > > > mche...@kernel.org; li...@roeck-us.net; x...@kernel.org; > > > > > > > linux-kernel@vger.kernel.org; > > > > > > > platform-driver- x...@vger.kernel.org; j...@resnulli.us > > > > > > > Subject: Re: [patch v1] x86/platform/mellanox: introduce > > > > > > > support for Mellanox systems platform > > > > > > > > > > > > > > On Mon, Sep 12, 2016 at 06:29:58AM +0000, > > > > > > > vad...@mellanox.com > > > wrote: > > > > > > > > From: Vadim Pasternak <vad...@mellanox.com> > > > > > > > > > > > > > > > > Enable system support for the Mellanox Technologies > > > > > > > > platform, which provides support for the next Mellanox basic > systems: > > > > > > > > "msx6710", "msx6720", "msb7700", "msn2700", "msx1410", > > > > > > > > "msn2410", "msb7800", "msn2740", "msn2100" and also > > > > > > > > various number of derivative systems from the above basic types. > > > > > > > > > > > > > > What does "system support" mean? > > > > > > > > > > > > > > Why can't this just be a "normal" PCI driver, as you are > > > > > > > just accessing a PCI device and doing something with it, > > > > > > > seems odd to claim it is a > > > > > "platform" driver. > > > > > > > > > > > > > > > > > > > This driver also activates probes to create i2c platform driver and > muxes. > > > > > > > > > > And how does it do that? Through the PCI device? > > > > > > > > > > > For ARM and PPC based systems I can activate such stuff through dts. > > > > > > To be honest I don't know what is the right way to do such > > > > > > things for > > > > > > x86 systems. > > > > > > > > > > How is it found in a x86 system, in ACPI? > > > > > > > > > > > > > We have no support in ACPI. > > > > Currently it could be found through DMI. > > > > > > > > > > If I will move PCI related stuff to separate driver, could you > > > > > > suggest some right location for that? > > > > > > > > > > Depends on what it does. > > > > > > > > It creates platform i2c driver (Mellanox controller), like: > > > > platform_device_register_simple("i2c_mlxcpld", -1, > > > > NULL, 0); > > > > And two mux platform device instances, like: > > > > platform_device_register_resndata(dev, > > > > " i2c-mux-reg", i, NULL, > > > > 0, > > > > &mlxplat_mux_data[i], > > > > > > > > sizeof(mlxplat_mux_data[i])); > > > > > > Ugh. Really? These aren't on a real bus? What is this, the 1990's? > > > > Actually this is 2015-2016. > > Many switches use i2c virtual buses infrastructure for placing slow > > devices for system monitoring and control. > > Yes, but that i2c controller is on what type of bus? A non-discoverable one? > That's what I'm complaining about...
This is LPC to I2C bridge. Controller logic is implemented in Lattice CPLD. CPLD itself is attached to LPC. > > thanks, > > greg k-h
