From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751447AbeECPNx (ORCPT ); Thu, 3 May 2018 11:13:53 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:7648 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751132AbeECPNr (ORCPT ); Thu, 3 May 2018 11:13:47 -0400 From: John Garry To: , , , CC: , , , , , , , John Garry Subject: [PATCH 0/2] HISI LPC ACPI UART support Date: Thu, 3 May 2018 23:08:37 +0800 Message-ID: <1525360119-102166-1-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset adds ACPI FW support for the UART on the LPC bus on the Huawei D03 development board. The UART is 8250-compatible, and has the following profile: - IO space iotype - no interrupt, so polling mode required - 16550 type Currently an mfd-cell (platform device) is created per device on the bus for using ACPI firmware. As such, we need require a platform driver for these devices. Currently no platform driver exists for the UART. Indeed, for PNP-compatible devices - like this UART - it would be better to create a PNP device so that we may use the existing PNP driver. Thus, we should use the 8250 PNP driver. However this host driver does not support PNP devices. An RFC was sent for PNP support in [1]. However it was deemed impractical to follow this path. As a solution, we use the 8250 generic isa driver. For this, we need to set the UART platform device name to match the 8250 isa driver, so we require special setup for this. To support this, we introduce static MFD cells, and support special setup handling for each device. For the UART, this means passing the 8250 serial config in the MFD cell platform data. 1. https://lkml.org/lkml/2018/4/20/278 Differences: RFC -> v1: https://lkml.org/lkml/2018/4/20/278 - drop PNP support - use static MFD cells - add 8250 setup John Garry (2): HISI LPC: Reference static MFD cells for ACPI support HISI LPC: Add ACPI UART support drivers/bus/hisi_lpc.c | 130 +++++++++++++++++++++++++++++++++++-------------- 1 file changed, 93 insertions(+), 37 deletions(-) -- 1.9.1