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Wed, 20 Jan 2021 00:02:03 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.5.0-alpha0-78-g36b56e88ef-fm-20210120.001-g36b56e88 Mime-Version: 1.0 Message-Id: In-Reply-To: <20210114131622.8951-3-chiawei_wang@aspeedtech.com> References: <20210114131622.8951-1-chiawei_wang@aspeedtech.com> <20210114131622.8951-3-chiawei_wang@aspeedtech.com> Date: Wed, 20 Jan 2021 15:31:41 +1030 From: "Andrew Jeffery" To: "Chia-Wei, Wang" , "Rob Herring" , "Lee Jones" , "Joel Stanley" , "Linus Walleij" , "Corey Minyard" , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org Subject: Re: [PATCH v5 2/5] ARM: dts: Remove LPC BMC and Host partitions X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210120_000205_043309_A03435FD X-CRM114-Status: GOOD ( 13.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: BMC-SW@aspeedtech.com, Cyril Bur , Haiyue Wang , Robert Lippert Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 14 Jan 2021, at 23:46, Chia-Wei, Wang wrote: > The LPC controller has no concept of the BMC and the Host partitions. > > A concrete instance is that the HICRB[5:4] are for the I/O port address > configurtaion of KCS channel 1/2. However, the KCS driver cannot access > HICRB for channel 1/2 initialization via syscon regmap interface due to > the parition boundary. (i.e. offset 80h) > > In addition, for the HW design backward compatibility, a newly added HW > control bit could be located at any reserved one over the LPC addressing > space. Thereby, this patch removes the lpc-bmc and lpc-host child node > and thus the LPC partitioning. > > Note that this change requires the synchronization between device tree > change and the driver change. To prevent the misuse of old devicetrees > with new drivers, or vice versa, the v2 compatible strings are adopted > for the LPC device as listed: > > "aspeed,ast2400-lpc-v2" > "aspeed,ast2500-lpc-v2" > "aspeed,ast2600-lpc-v2" > > Signed-off-by: Chia-Wei, Wang Reviewed-by: Andrew Jeffery _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel