From patchwork Sun Jan 15 15:14:43 2023 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: 643085 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 4C066C677F1 for ; Sun, 15 Jan 2023 15:14:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231367AbjAOPO2 (ORCPT ); Sun, 15 Jan 2023 10:14:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231420AbjAOPOU (ORCPT ); Sun, 15 Jan 2023 10:14:20 -0500 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF2011041E; Sun, 15 Jan 2023 07:14:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1673795653; x=1705331653; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=+iOufPRgopYuYmLXRsJEiPulQI4xkelEme+NJan0C7s=; b=g7Md2yfx8ltlvtAyJu5MsgZNB2nSp7x/khwi2OvQS1VVeQQvoXS4Z0Js y2OrZGb+LANIhRliBYvrcj3GM4xU5GU4+xoXnMlYZZG9+i5lbhoG26Iat 6Noxx4eJ5n8Bm0sjlqRJLb52iz8Hqm/ShdSJC8YVe+d6L+XnsetArit2d XW8Rpz6vDhzoc+TOdgPTm1L1K4QB236YjU9IJewDiw1eKqYKCZhpzMe9M JjHwIouEub602iIhrTP/hBbyAuYP2MXNwAYusKJouJtME847CLJG8f9df R8OEvTyylSr/LJn/3X3t33bWNdELmU9W1W2HaIIhZj6I4HDqqPaeN8+/u g==; X-IronPort-AV: E=McAfee;i="6500,9779,10591"; a="386648428" X-IronPort-AV: E=Sophos;i="5.97,218,1669104000"; d="scan'208";a="386648428" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jan 2023 07:14:13 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10591"; a="722047868" X-IronPort-AV: E=Sophos;i="5.97,218,1669104000"; d="scan'208";a="722047868" Received: from rhweight-wrk1.ra.intel.com ([137.102.106.43]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jan 2023 07:14:12 -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, bagasdotme@gmail.com Cc: Matthew Gerlach Subject: [PATCH v11 0/4] Enhance definition of DFH and use enhancements for UART driver Date: Sun, 15 Jan 2023 07:14:43 -0800 Message-Id: <20230115151447.1353428-1-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 | 119 ++++++++++++++ drivers/fpga/dfl.c | 245 +++++++++++++++++++++++------ drivers/fpga/dfl.h | 43 +++++ drivers/tty/serial/8250/8250_dfl.c | 167 ++++++++++++++++++++ drivers/tty/serial/8250/Kconfig | 12 ++ drivers/tty/serial/8250/Makefile | 1 + include/linux/dfl.h | 8 + 7 files changed, 544 insertions(+), 51 deletions(-) create mode 100644 drivers/tty/serial/8250/8250_dfl.c Reviewed-by: Marco Pagani