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[23.128.96.18]) by mx.google.com with ESMTP id e19si1787538edr.7.2020.09.03.07.32.14; Thu, 03 Sep 2020 07:32:14 -0700 (PDT) Received-SPF: pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=iZLw1CfU; spf=pass (google.com: domain of devicetree-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729356AbgICOcK (ORCPT + 6 others); Thu, 3 Sep 2020 10:32:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35490 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729307AbgICO1p (ORCPT ); Thu, 3 Sep 2020 10:27:45 -0400 Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A4FCEC061265 for ; Thu, 3 Sep 2020 06:21:22 -0700 (PDT) Received: by mail-lj1-x243.google.com with SMTP id w3so3662647ljo.5 for ; Thu, 03 Sep 2020 06:21:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=wcVYXgQ5pttw1IKCDgQFlSKYdGXdwjbBjMlIEbUjqiQ=; b=iZLw1CfUpf3zao1xXVpOnJTFOmznOoCWLAU15PeWwd16NwdTP2lGXLKN4iSi6eR0i6 x+zv7dQuz4X0lGxw64dYnfTCDF3jXrFctSGJ1Qb+QeNWWJToXF/bayDRh0USlB20xWU2 xcYHy9v+xKy8bizid6TCyu1VQ/i1vAn+ZYkZk2cstVoPua/zC/DG9cLE91kpZAc022QI inCfL8jDqhQIVS0+/YW/M0U5Dr2hs/eG2r2Kgrzagdw+hTG4alTmxvysUoOrDg9TsXa1 hV4inadOBaQVDQGWmHe6zE2vy9Oz36Hyl8Nt+CDAvzGQefDphw08x4xz00sppiHbMINu t76w== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=wcVYXgQ5pttw1IKCDgQFlSKYdGXdwjbBjMlIEbUjqiQ=; b=OmWzIUemWkGz6lSNjGjY9oUWHxkB++7q/6IziIiArpN2r3pgImaGLwEjZj+eBeCKKq 3MOPBlss0VlP/yEmMa/LpekdetymMYAatfABLVVX5TjtqMG0gM56VS2rfTbWwbyFRfTD uZ8JFkjT2PiIAP+IRz4Zy6mnoxqL/4IYh2tBSRX3QNncIkFLHmJnftW29gs9cvAotvDD zyiOmfV4wXKsPx3UxkHEI9S5kY6BXPOUi6Ra9xeIAvSWBjRfJQHUFbyRZaMVq5OoWg+Z upU+1QwrljqZ1D8yhtx1prirS54waPcVcBP+vYT+42Ig/r6XPiZ652XwYelGM4U/+eLc LtJQ== X-Gm-Message-State: AOAM533Mk9FYC8U/GUqYwAmsWp+S4gLg3/Qg44WR82E1a1OX2YxDfjPQ jGj4qHdswrb1UCzGYHJiJ4Rw6w== X-Received: by 2002:a2e:8215:: with SMTP id w21mr1246122ljg.43.1599139280959; Thu, 03 Sep 2020 06:21:20 -0700 (PDT) Received: from eriador.lan ([188.162.64.138]) by smtp.gmail.com with ESMTPSA id e23sm584220lfj.80.2020.09.03.06.21.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Sep 2020 06:21:20 -0700 (PDT) From: Dmitry Baryshkov To: Andy Gross , Bjorn Andersson , Rob Herring , Zhang Rui , Daniel Lezcano , Amit Kucheria , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler Cc: linux-arm-msm@vger.kernel.org, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, Craig Tatlor Subject: [PATCH v2 2/9] fixp-arith: add a linear interpolation function Date: Thu, 3 Sep 2020 16:21:02 +0300 Message-Id: <20200903132109.1914011-3-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200903132109.1914011-1-dmitry.baryshkov@linaro.org> References: <20200903132109.1914011-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Craig Tatlor Adds a function to interpolate against two points, this is carried arount as a helper function by tons of drivers. Signed-off-by: Craig Tatlor Signed-off-by: Dmitry Baryshkov --- include/linux/fixp-arith.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) -- 2.28.0 diff --git a/include/linux/fixp-arith.h b/include/linux/fixp-arith.h index 8396013785ef..281cb4f83dbe 100644 --- a/include/linux/fixp-arith.h +++ b/include/linux/fixp-arith.h @@ -141,4 +141,23 @@ static inline s32 fixp_sin32_rad(u32 radians, u32 twopi) #define fixp_cos32_rad(rad, twopi) \ fixp_sin32_rad(rad + twopi / 4, twopi) +/** + * fixp_linear_interpolate() - interpolates a value from two known points + * + * @x0: x value of point 0 + * @y0: y value of point 0 + * @x1: x value of point 1 + * @y1: y value of point 1 + * @x: the linear interpolant + */ +static inline int fixp_linear_interpolate(int x0, int y0, int x1, int y1, int x) +{ + if (y0 == y1 || x == x0) + return y0; + if (x1 == x0 || x == x1) + return y1; + + return y0 + ((y1 - y0) * (x - x0) / (x1 - x0)); +} + #endif