From patchwork Fri Dec 9 21:45:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: matthew.gerlach@linux.intel.com X-Patchwork-Id: 632854 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AAD92C04FDE for ; Fri, 9 Dec 2022 21:45:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230035AbiLIVpc (ORCPT ); Fri, 9 Dec 2022 16:45:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39600 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230016AbiLIVpC (ORCPT ); Fri, 9 Dec 2022 16:45:02 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EAE913D386; Fri, 9 Dec 2022 13:45:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1670622302; x=1702158302; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=TuSrvu1jx9I5ZHmEkMMea0Y8tKsaVWKLe+FE0ZgyQOc=; b=nGZSv+gwEgjeIptDiFQSHELWkNfMGmfN6+8A6AgGTKPfJR9cjixaVTum Urmz88gqvg6PC/TZtSIlVzoLQw1sPZGVIYmn6lsxpghQfFQAG+bKwgATw abGUF2M2aRloOkwrO1gmciyWOmzTdtNcDWOF5OPbkO22Ps90svZHl79cw baY6oifccWHo4MnD3vNG3ZIycj/N0bIMNTRZpiFr1iqoeSv7yuKvdXtmR yHb1WWt9FIRVa7+xgil5F5j9CvL/O0Exg7RUcg0weOxIUhXViyOQJer4U uL9iZwAw+xZ4Cgrm9K1h8OsvtISweNNvDKe0qMuczeyxnIu2568k+u513 g==; X-IronPort-AV: E=McAfee;i="6500,9779,10556"; a="300975520" X-IronPort-AV: E=Sophos;i="5.96,232,1665471600"; d="scan'208";a="300975520" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2022 13:45:00 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10556"; a="711031664" X-IronPort-AV: E=Sophos;i="5.96,232,1665471600"; d="scan'208";a="711031664" Received: from rhweight-wrk1.ra.intel.com ([137.102.106.139]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2022 13:44:59 -0800 From: matthew.gerlach@linux.intel.com To: hao.wu@intel.com, yilun.xu@intel.com, russell.h.weight@intel.com, basheer.ahmed.muddebihal@intel.com, trix@redhat.com, mdf@kernel.org, linux-fpga@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tianfei.zhang@intel.com, corbet@lwn.net, gregkh@linuxfoundation.org, linux-serial@vger.kernel.org, jirislaby@kernel.org, geert+renesas@glider.be, andriy.shevchenko@linux.intel.com, niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk, johan@kernel.org, lukas@wunner.de, ilpo.jarvinen@linux.intel.com, marpagan@redhat.com Cc: Matthew Gerlach Subject: [PATCH v6 0/4] Enhance definition of DFH and use enhancements for UART driver Date: Fri, 9 Dec 2022 13:45:19 -0800 Message-Id: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Matthew Gerlach This patchset enhances the definition of the Device Feature Header (DFH) used by the Device Feature List (DFL) bus and then uses the new enhancements in a UART driver. The enhancements to the DFH includes the introduction of parameter blocks. Like PCI capabilities, the DFH parameter blocks further describe the hardware to software. In the case of the UART, the parameter blocks provide information for the interrupt, clock frequency, and register layout. Duplication of code parsing of the parameter blocks in multiple DFL drivers is a concern. Using swnodes was considered to help minimize parsing code duplication, but their use did not help the problem. Furthermore the highly changeable nature of FPGAs employing the DFL bus makes the use of swnodes inappropriate. Patch 1 updates the DFL documentation to describe the added functionality to DFH. Patch 2 adds the definitions for DFHv1. Patch 3 adds basic support for DFHv1. It adds functionality to parse parameter blocks and adds the functionality to parse the explicit location of a feature's register set. Patch 4 adds a DFL UART driver that makes use of the new features of DFHv1. Basheer Ahmed Muddebihal (1): fpga: dfl: Add DFHv1 Register Definitions Matthew Gerlach (3): Documentation: fpga: dfl: Add documentation for DFHv1 fpga: dfl: add basic support for DFHv1 tty: serial: 8250: add DFL bus driver for Altera 16550. Documentation/fpga/dfl.rst | 103 +++++++++++++ drivers/fpga/dfl.c | 234 ++++++++++++++++++++++------- drivers/fpga/dfl.h | 41 +++++ drivers/tty/serial/8250/8250_dfl.c | 154 +++++++++++++++++++ drivers/tty/serial/8250/Kconfig | 12 ++ drivers/tty/serial/8250/Makefile | 1 + include/linux/dfl.h | 4 + 7 files changed, 498 insertions(+), 51 deletions(-) create mode 100644 drivers/tty/serial/8250/8250_dfl.c