linux-kernel - [PATCH 07/13] opp: Allow _generic_set_opp_clk

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Message-Id: <1585f6c21ea8aee64fe4da0bf72b36ea4d74a779.1611227342.git.viresh.kumar@linaro.org>
Date:   Thu, 21 Jan 2021 16:47:47 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 07/13] opp: Allow _generic_set_opp_clk_only() to work for non-freq devices

In order to avoid conditional statements at the caller site, this patch
updates _generic_set_opp_clk_only() to work for devices that don't
change frequency (like power domains, etc.). Return 0 if the clk pointer
passed to this routine is not valid.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/opp/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index a96ffd9051b1..6b09d468d37a 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -726,6 +726,10 @@ static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
 {
 	int ret;
 
+	/* We may reach here for devices which don't change frequency */
+	if (unlikely(!clk))
+		return 0;
+
 	ret = clk_set_rate(clk, freq);
 	if (ret) {
 		dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
-- 
2.25.0.rc1.19.g042ed3e048af