linux-kernel - [PATCH 21/33] clk: qcom: ipq4019: change clk_cpu_div_round

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Message-Id: <1514596392-22270-22-git-send-email-pure.logic@nexus-software.ie>
Date:   Sat, 30 Dec 2017 01:13:00 +0000
From:   Bryan O'Donoghue <pure.logic@...us-software.ie>
To:     mturquette@...libre.com, sboyd@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Cc:     pure.logic@...us-software.ie, Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Abhishek Sahu <absahu@...eaurora.org>,
        Varadarajan Narayanan <varada@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Subject: [PATCH 21/33] clk: qcom: ipq4019: change clk_cpu_div_round_rate() return logic

This patch updates the round_rate() logic here to return zero instead of a
negative number on error.

In conjunction with higher-level changes associated with acting on the
return value of clk_ops->round_rate() it is then possible to have
clk_ops->round_rate() return values from 1 Hz to ULONG_MAX Hz instead of
the current limitation of 1 Hz to LONG_MAX Hz.

Signed-off-by: Bryan O'Donoghue <pure.logic@...us-software.ie>
Cc: Andy Gross <andy.gross@...aro.org>
Cc: David Brown <david.brown@...aro.org>
Cc: Abhishek Sahu <absahu@...eaurora.org>
Cc: Varadarajan Narayanan <varada@...eaurora.org>
Cc: Michael Turquette <mturquette@...libre.com>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: linux-arm-msm@...r.kernel.org
Cc: linux-soc@...r.kernel.org
Cc: linux-clk@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/clk/qcom/gcc-ipq4019.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gcc-ipq4019.c b/drivers/clk/qcom/gcc-ipq4019.c
index 804231b..943acbc 100644
--- a/drivers/clk/qcom/gcc-ipq4019.c
+++ b/drivers/clk/qcom/gcc-ipq4019.c
@@ -1268,7 +1268,7 @@ static unsigned long clk_cpu_div_round_rate(struct clk_hw *hw,
 
 	f = qcom_find_freq(pll->freq_tbl, rate);
 	if (!f)
-		return -EINVAL;
+		return 0;
 
 	p_hw = clk_hw_get_parent_by_index(hw, f->src);
 	*p_rate = clk_hw_get_rate(p_hw);
-- 
2.7.4