From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965439AbdEOOB1 (ORCPT ); Mon, 15 May 2017 10:01:27 -0400 Received: from mail-sn1nam02on0060.outbound.protection.outlook.com ([104.47.36.60]:11440 "EHLO NAM02-SN1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965295AbdEON7b (ORCPT ); Mon, 15 May 2017 09:59:31 -0400 Authentication-Results: spf=fail (sender IP is 192.88.168.50) smtp.mailfrom=nxp.com; nxp.com; dkim=none (message not signed) header.d=none;nxp.com; dmarc=fail action=none header.from=nxp.com; From: Dong Aisheng To: CC: , , , , , , , Dong Aisheng Subject: [PATCH 3/9] clk: fractional-divider: add CLK_FRAC_DIVIDER_ZERO_BASED flag support Date: Mon, 15 May 2017 21:59:17 +0800 Message-ID: <1494856763-6543-4-git-send-email-aisheng.dong@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1494856763-6543-1-git-send-email-aisheng.dong@nxp.com> References: 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start from 0. This can be used to support frac dividers like below: Divider output clock = Divider input clock x [(frac +1) / (div +1)] where frac/div in register is: 000b - Divide by 1. 001b - Divide by 2. 010b - Divide by 3. Cc: Stephen Boyd Cc: Michael Turquette Signed-off-by: Dong Aisheng --- drivers/clk/clk-fractional-divider.c | 10 ++++++++++ include/linux/clk-provider.h | 7 +++++++ 2 files changed, 17 insertions(+) diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c index aab9046..455bec5 100644 --- a/drivers/clk/clk-fractional-divider.c +++ b/drivers/clk/clk-fractional-divider.c @@ -40,6 +40,11 @@ static unsigned long clk_fd_recalc_rate(struct clk_hw *hw, m = (val & fd->mmask) >> fd->mshift; n = (val & fd->nmask) >> fd->nshift; + if (fd->flags & CLK_FRAC_DIVIDER_ZERO_BASED) { + m++; + n++; + } + if (!n || !m) return parent_rate; @@ -91,6 +96,11 @@ static int clk_fd_set_rate(struct clk_hw *hw, unsigned long rate, GENMASK(fd->mwidth - 1, 0), GENMASK(fd->nwidth - 1, 0), &m, &n); + if (fd->flags & CLK_FRAC_DIVIDER_ZERO_BASED) { + m--; + n--; + } + if (fd->lock) spin_lock_irqsave(fd->lock, flags); else diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index a6efbb9..4466cae 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -557,6 +557,11 @@ void clk_hw_unregister_fixed_factor(struct clk_hw *hw); * @lock: register lock * * Clock with adjustable fractional divider affecting its output frequency. + * + * Flags: + * CLK_FRAC_DIVIDER_ZERO_BASED - by default the divisor is the value read + * from the register. If CLK_FRAC_DIVIDER_ZERO_BASED is set then the + * divider is the raw value read from the register plus one. */ struct clk_fractional_divider { struct clk_hw hw; @@ -573,6 +578,8 @@ struct clk_fractional_divider { #define to_clk_fd(_hw) container_of(_hw, struct clk_fractional_divider, hw) +#define CLK_FRAC_DIVIDER_ZERO_BASED BIT(0) + extern const struct clk_ops clk_fractional_divider_ops; struct clk *clk_register_fractional_divider(struct device *dev, const char *name, const char *parent_name, unsigned long flags, -- 2.7.4