Date: Wed, 8 May 2019 09:37:04 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Gleb Popov <arrowd@freebsd.org>, freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: FreeBSD sees only one I2C device, while Linux sees two. Message-ID: <dbab2aec-a221-65c3-ab5e-f9e0f3365dc4@FreeBSD.org> In-Reply-To: <CALH631=nWt46FRb7RRZgXFfPioOWbA9LSGWykOs5Viyp7BNhkQ@mail.gmail.com> References: <CALH631=nWt46FRb7RRZgXFfPioOWbA9LSGWykOs5Viyp7BNhkQ@mail.gmail.com>
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On 07/05/2019 22:04, Gleb Popov wrote: > However, on FreeBSD I get different picture. pciconf lists both devices: > > ig4iic_pci0@pci0:0:21:0: class=0x118000 card=0x15e01043 > chip=0xa1608086 rev=0x31 hdr=0x00 > vendor = 'Intel Corporation' > device = '100 Series/C230 Series Chipset Family Serial IO I2C > Controller' > class = dasp > > ichsmb0@pci0:0:31:4: class=0x0c0500 card=0x15e01043 chip=0xa1238086 > rev=0x31 hdr=0x00 > vendor = 'Intel Corporation' > device = '100 Series/C230 Series Chipset Family SMBus' > class = serial bus > subclass = SMBus > > But there is only one /dev/iic0 device. Relevant devinfo parts: > > ig4iic_pci0 > iicbus0 > iic0 > iicsmb0 > smbus1 > > ichsmb0 > smbus0 > > Is there something missing in the kernel, or I'm just doing something wrong? One is an I2C controller, the other is an SMBus controller (SMBus being a sort of a subset of I2C). That's why you have iicbus0 and smbus0. All hardware is visible. It seems that you do not have smb(4) driver and, thus, there is no /dev/smbX. -- Andriy Gapon
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