Hi Cédric, > -----Original Message----- > From: Cédric Le Goater <c...@kaod.org> > Sent: Friday, January 3, 2025 5:44 PM > To: Steven Lee <steven_...@aspeedtech.com>; Peter Maydell > <peter.mayd...@linaro.org>; Troy Lee <leet...@gmail.com>; Jamin Lin > <jamin_...@aspeedtech.com>; Andrew Jeffery > <and...@codeconstruct.com.au>; Joel Stanley <j...@jms.id.au>; open > list:ASPEED BMCs <qemu-...@nongnu.org>; open list:All patches CC here > <qemu-devel@nongnu.org> > Cc: Troy Lee <troy_...@aspeedtech.com>; Yunlin Tang > <yunlin.t...@aspeedtech.com> > Subject: Re: [PATCH 2/5] aspeed: ast27x0: Map unimplemented devices in SoC > memory > > On 1/3/25 09:14, Steven Lee wrote: > > Hi Cédric, > > > >> -----Original Message----- > >> From: Cédric Le Goater <c...@kaod.org> > >> Sent: Friday, December 27, 2024 5:53 PM > >> To: Steven Lee <steven_...@aspeedtech.com>; Peter Maydell > >> <peter.mayd...@linaro.org>; Troy Lee <leet...@gmail.com>; Jamin Lin > >> <jamin_...@aspeedtech.com>; Andrew Jeffery > >> <and...@codeconstruct.com.au>; Joel Stanley <j...@jms.id.au>; open > >> list:ASPEED BMCs <qemu-...@nongnu.org>; open list:All patches CC here > >> <qemu-devel@nongnu.org> > >> Cc: Troy Lee <troy_...@aspeedtech.com>; Yunlin Tang > >> <yunlin.t...@aspeedtech.com> > >> Subject: Re: [PATCH 2/5] aspeed: ast27x0: Map unimplemented devices > >> in SoC memory > >> > >> Hello, > >> > >> On 12/25/24 03:03, Steven Lee wrote: > >>> Maps following unimplemented devices in SoC memory > >>> - dpmcu > >>> - iomem0 > >>> - iomem1 > >>> - ltpi > >>> - io > >> > >> Could you please add a sentence about what these devices are ? > >> > >> Thanks, > >> > >> C. > >> > > > > DPMCU stands for Display Port MCU controller. > > Regarding LTPI, when the AST1700 is connected to the AST2700, AST1070 > LTPI controller's registers are mapped to 0x30000000. > > Is the LTPI IP a device for communication between SoCs ?
Yes, it can be used to connect to AST1700. AST1700 is an I/O expander that supports the DC-SCM 2.1 LTPI protocol. It provides AST2700 with additional GPIO, UART, I3C, and other interfaces. Thanks, Steven > > > Io, Iomem0 and Iomem1 include unimplemented controllers in the memory > ranges 0x120000000 - 0x121000000 and 0x14000000 - 0x141000000. > > For instance: > > - USB hub at 0x12010000 > > - eSPI at 0x14C5000 > > - PWM at 0x140C0000 > > > > I will include the description in the commit message. > > yes please. > > Thanks, > > C. > >
