From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: [patch v1] x86/platform/mellanox: introduce support for Mellanox systems platform Date: Mon, 12 Sep 2016 10:17:12 +0200 Message-ID: <20160912081712.GA27368@kroah.com> References: <1473661798-112691-1-git-send-email-vadimp@mellanox.com> <20160912061237.GB11230@kroah.com> <20160912070457.GA4590@kroah.com> <20160912074059.GA19325@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Vadim Pasternak Cc: "tglx@linutronix.de" , "mingo@redhat.com" , "hpa@zytor.com" , "davem@davemloft.net" , "geert@linux-m68k.org" , "akpm@linux-foundation.org" , "kvalo@codeaurora.org" , "mchehab@kernel.org" , "linux@roeck-us.net" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , "platform-driver-x86@vger.kernel.org" , "jiri@resnulli.us" List-Id: platform-driver-x86.vger.kernel.org On Mon, Sep 12, 2016 at 07:48:24AM +0000, Vadim Pasternak wrote: > > > > -----Original Message----- > > From: Greg KH [mailto:gregkh@linuxfoundation.org] > > Sent: Monday, September 12, 2016 10:41 AM > > To: Vadim Pasternak > > Cc: tglx@linutronix.de; mingo@redhat.com; hpa@zytor.com; > > davem@davemloft.net; geert@linux-m68k.org; akpm@linux-foundation.org; > > kvalo@codeaurora.org; mchehab@kernel.org; linux@roeck-us.net; > > x86@kernel.org; linux-kernel@vger.kernel.org; platform-driver- > > x86@vger.kernel.org; jiri@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:gregkh@linuxfoundation.org] > > > > Sent: Monday, September 12, 2016 10:05 AM > > > > To: Vadim Pasternak > > > > Cc: tglx@linutronix.de; mingo@redhat.com; hpa@zytor.com; > > > > davem@davemloft.net; geert@linux-m68k.org; > > > > akpm@linux-foundation.org; kvalo@codeaurora.org; mchehab@kernel.org; > > > > linux@roeck-us.net; x86@kernel.org; linux-kernel@vger.kernel.org; > > > > platform-driver- x86@vger.kernel.org; jiri@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:gregkh@linuxfoundation.org] > > > > > > Sent: Monday, September 12, 2016 9:13 AM > > > > > > To: Vadim Pasternak > > > > > > Cc: tglx@linutronix.de; mingo@redhat.com; hpa@zytor.com; > > > > > > davem@davemloft.net; geert@linux-m68k.org; > > > > > > akpm@linux-foundation.org; kvalo@codeaurora.org; > > > > > > mchehab@kernel.org; linux@roeck-us.net; x86@kernel.org; > > > > > > linux-kernel@vger.kernel.org; > > > > > > platform-driver- x86@vger.kernel.org; jiri@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, vadimp@mellanox.com > > wrote: > > > > > > > From: Vadim Pasternak > > > > > > > > > > > > > > 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... thanks, greg k-h