Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751259AbdL3BUv (ORCPT ); Fri, 29 Dec 2017 20:20:51 -0500 Received: from mail-wm0-f68.google.com ([74.125.82.68]:46637 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750881AbdL3BNQ (ORCPT ); Fri, 29 Dec 2017 20:13:16 -0500 X-Google-Smtp-Source: ACJfBouC1abwVVCAY9x0I9YVd+PQrKxhx61ft0ngAfh4+4Wa5h1CsK/IJXesyAffxPd6T+9AuHWqhw== From: "Bryan O'Donoghue" To: mturquette@baylibre.com, sboyd@codeaurora.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org Cc: pure.logic@nexus-software.ie Subject: [PATCH 02/33] clk: core: update divider_round_rate functions to return unsigned long Date: Sat, 30 Dec 2017 01:12:41 +0000 Message-Id: <1514596392-22270-3-git-send-email-pure.logic@nexus-software.ie> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1514596392-22270-1-git-send-email-pure.logic@nexus-software.ie> References: <1514596392-22270-1-git-send-email-pure.logic@nexus-software.ie> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3354 Lines: 82 Returning a long from round_rate() class functions is rooted in the notion that we will propagate a negative number on some class of failure to round a clock rate; however this approach does not scale to 32 bit systems which legitimately round a clock over LONG_MAX as the returned clock rate is indistinguishable from an error number. A better approach is to return zero when we cannot round a clock and non-zero when we can - thus supporting the full range of the unsigned long rate input value to round_rate() functions. Update the signature of divider_round_rate functions to do this now. Signed-off-by: Bryan O'Donoghue Cc: Michael Turquette Cc: Stephen Boyd Cc: linux-clk@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- drivers/clk/clk-divider.c | 10 ++++++---- include/linux/clk-provider.h | 19 +++++++++++-------- 2 files changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c index a26ec7c..e827304 100644 --- a/drivers/clk/clk-divider.c +++ b/drivers/clk/clk-divider.c @@ -332,10 +332,12 @@ static int clk_divider_bestdiv(struct clk_hw *hw, struct clk_hw *parent, return bestdiv; } -long divider_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent, - unsigned long rate, unsigned long *prate, - const struct clk_div_table *table, - u8 width, unsigned long flags) +unsigned long divider_round_rate_parent(struct clk_hw *hw, + struct clk_hw *parent, + unsigned long rate, + unsigned long *prate, + const struct clk_div_table *table, + u8 width, unsigned long flags) { int div; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index 79b1d6e..e763d94 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -413,10 +413,12 @@ extern const struct clk_ops clk_divider_ro_ops; unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate, unsigned int val, const struct clk_div_table *table, unsigned long flags); -long divider_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent, - unsigned long rate, unsigned long *prate, - const struct clk_div_table *table, - u8 width, unsigned long flags); +unsigned long divider_round_rate_parent(struct clk_hw *hw, + struct clk_hw *parent, + unsigned long rate, + unsigned long *prate, + const struct clk_div_table *table, + u8 width, unsigned long flags); int divider_get_val(unsigned long rate, unsigned long parent_rate, const struct clk_div_table *table, u8 width, unsigned long flags); @@ -762,10 +764,11 @@ static inline void __clk_hw_set_clk(struct clk_hw *dst, struct clk_hw *src) dst->core = src->core; } -static inline long divider_round_rate(struct clk_hw *hw, unsigned long rate, - unsigned long *prate, - const struct clk_div_table *table, - u8 width, unsigned long flags) +static inline unsigned long divider_round_rate(struct clk_hw *hw, + unsigned long rate, + unsigned long *prate, + const struct clk_div_table *table, + u8 width, unsigned long flags) { return divider_round_rate_parent(hw, clk_hw_get_parent(hw), rate, prate, table, width, flags); -- 2.7.4