From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20D95C43381 for ; Fri, 29 Mar 2019 03:02:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DC25A2183E for ; Fri, 29 Mar 2019 03:02:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ORW5BN34" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728636AbfC2DC4 (ORCPT ); Thu, 28 Mar 2019 23:02:56 -0400 Received: from mail-pl1-f196.google.com ([209.85.214.196]:43509 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727654AbfC2DC4 (ORCPT ); Thu, 28 Mar 2019 23:02:56 -0400 Received: by mail-pl1-f196.google.com with SMTP id m10so296759plt.10; Thu, 28 Mar 2019 20:02:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=UjnfdwamcKCvdCdclf1O0h9o8hu8IZ1eKNVDHWa1+Cc=; b=ORW5BN34nhsEGHWws7FM3zBAAM8vRob6AXhbmf3iUlpYhbO3/K7Olduf51W8i/tt3n eTkoHzNzbhd5zxO5wyOh9ZtelR8SMTojVeGo5Zru92u9HlmnN4m5kbGIJneXd2BMjz8J WjFPgOx3o87F11jIQVG4upw7G/8VtAde31YQf/ONPe7w9Lex/Vb3kna3UKr895gP9s+j bMe+pdCfyiM1aaOEWMdq69tt7w9xTKC53wnxpYg1vLLM8bqN1mv51fedjiVzExfq39u2 6nFtwKbdACTaQr4ppDulkouUqDgka6SH2epkFguDWmu7RBw/xI1/LOyVIRto7tURKifK 2kbQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=UjnfdwamcKCvdCdclf1O0h9o8hu8IZ1eKNVDHWa1+Cc=; b=A/EC+v4CX2/hKFnMt4pOgxFzebmI7ILv4wausMaUa5aljE1j1hnGCHMS3hjDcOA6F6 4/H0dh11HEpKFUyYXmgUI+d0H9olZteah1IBBErJ9X6zqRFya9qMXCtQoMHNTaVSvEYX 168zWvMAHykjSbfZib5ZVb8GPOCfVgM4bJnXp9SEbz6OWmanR2YTbCy8nTD0nXfblU1T Pm/dwVDBd35Z31p46dCREsI+d9ZarBFjnSO+u2LCehXKRtpXDpdPrzkdHOuyRc47d6Sy xAMnBMMPkCwf5ztc11aJJ4xY+4PX4NRxkfVd/W2ZDjcswIuB09tBMtQIE8LiaiAl3W6+ 1POw== X-Gm-Message-State: APjAAAV8mU+QjBRKGzNOq7ma8cNnXEwbqdtow/mkIZ3UnAdC2DCnzoQV ikLn5PgJUbC2jBSM5cRLag4= X-Google-Smtp-Source: APXvYqxCnhX1quMYnpw+IcUytnVZ34vtD9FUcPibn6VAyav7RvOyhB4IRT2gXEGVPMLxrunZ7ppCqw== X-Received: by 2002:a17:902:42:: with SMTP id 60mr46115333pla.132.1553828575060; Thu, 28 Mar 2019 20:02:55 -0700 (PDT) Received: from localhost.localdomain ([2001:268:c0a5:ba2:c70:4af9:86e2:2]) by smtp.gmail.com with ESMTPSA id v82sm749926pfa.170.2019.03.28.20.02.49 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 28 Mar 2019 20:02:53 -0700 (PDT) From: William Breathitt Gray To: linus.walleij@linaro.org, bgolaszewski@baylibre.com Cc: akpm@linux-foundation.org, linux-gpio@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk, yamada.masahiro@socionext.com, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, geert@linux-m68k.org, preid@electromag.com.au, lukas@wunner.de, William Breathitt Gray Subject: [PATCH v14 00/11] Introduce the for_each_set_clump8 macro Date: Fri, 29 Mar 2019 12:03:30 +0900 Message-Id: X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Changes in v14: - Redefine bitmap_get_value8, bitmap_set_value8, and find_next_clump8 as static inline functions - Rename 'idx' variable to 'index' in the bitmap_get_value8 and bitmap_set_value8 functions - Remove superfluous parens in gen_74x164_set_multiple While adding GPIO get_multiple/set_multiple callback support for various drivers, I noticed a pattern of looping manifesting that would be useful standardized as a macro. This patchset introduces the for_each_set_clump8 macro and utilizes it in several GPIO drivers. The for_each_set_clump macro8 facilitates a for-loop syntax that iterates over a memory region entire groups of set bits at a time. For example, suppose you would like to iterate over a 32-bit integer 8 bits at a time, skipping over 8-bit groups with no set bit, where XXXXXXXX represents the current 8-bit group: Example: 10111110 00000000 11111111 00110011 First loop: 10111110 00000000 11111111 XXXXXXXX Second loop: 10111110 00000000 XXXXXXXX 00110011 Third loop: XXXXXXXX 00000000 11111111 00110011 Each iteration of the loop returns the next 8-bit group that has at least one set bit. The for_each_set_clump8 macro has four parameters: * start: set to the bit offset of the current clump * clump: set to the current clump value * bits: bitmap to search within * size: bitmap size in number of bits In this version of the patchset, the for_each_set_clump macro has been reimplemented and simplified based on the suggestions provided by Rasmus Villemoes and Andy Shevchenko in the version 4 submission. In particular, the function of the for_each_set_clump macro has been restricted to handle only 8-bit clumps; the drivers that use the for_each_set_clump macro only handle 8-bit ports so a generic for_each_set_clump implementation is not necessary. Thus, a solution for large clumps (i.e. those larger than the width of a bitmap word) can be postponed until a driver appears that actually requires such a generic for_each_set_clump implementation. For what it's worth, a semi-generic for_each_set_clump (i.e. for clumps smaller than the width of a bitmap word) can be implemented by simply replacing the hardcoded '8' and '0xFF' instances with respective variables. I have not yet had a need for such an implementation, and since it falls short of a true generic for_each_set_clump function, I have decided to forgo such an implementation for now. In addition, the bitmap_get_value8 and bitmap_set_value8 functions are introduced to get and set 8-bit values respectively. Their use is based on the behavior suggested in the patchset version 4 review. William Breathitt Gray (11): bitops: Introduce the for_each_set_clump8 macro lib/test_bitmap.c: Add for_each_set_clump8 test cases gpio: 104-dio-48e: Utilize for_each_set_clump8 macro gpio: 104-idi-48: Utilize for_each_set_clump8 macro gpio: gpio-mm: Utilize for_each_set_clump8 macro gpio: ws16c48: Utilize for_each_set_clump8 macro gpio: pci-idio-16: Utilize for_each_set_clump8 macro gpio: pcie-idio-24: Utilize for_each_set_clump8 macro gpio: uniphier: Utilize for_each_set_clump8 macro gpio: 74x164: Utilize the for_each_set_clump8 macro thermal: intel: intel_soc_dts_iosf: Utilize for_each_set_clump8 macro drivers/gpio/gpio-104-dio-48e.c | 73 ++++---------- drivers/gpio/gpio-104-idi-48.c | 36 ++----- drivers/gpio/gpio-74x164.c | 19 ++-- drivers/gpio/gpio-gpio-mm.c | 73 ++++---------- drivers/gpio/gpio-pci-idio-16.c | 75 +++++--------- drivers/gpio/gpio-pcie-idio-24.c | 109 ++++++++------------- drivers/gpio/gpio-uniphier.c | 16 ++- drivers/gpio/gpio-ws16c48.c | 73 ++++---------- drivers/thermal/intel/intel_soc_dts_iosf.c | 29 +++--- drivers/thermal/intel/intel_soc_dts_iosf.h | 2 - include/asm-generic/bitops/find.h | 61 ++++++++++++ include/linux/bitops.h | 5 + lib/test_bitmap.c | 65 ++++++++++++ 13 files changed, 299 insertions(+), 337 deletions(-) -- 2.21.0