linux-kernel - [PATCH] clk: Do a DT parent lookup even when index

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Message-Id: <20190614181040.67326-1-sboyd@kernel.org>
Date:   Fri, 14 Jun 2019 11:10:40 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        Alexandre Mergnat <amergnat@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Chen-Yu Tsai <wens@...e.org>
Subject: [PATCH] clk: Do a DT parent lookup even when index < 0

We want to allow the parent lookup to happen even if the index is some
value less than 0. This may be the case if a clk provider only specifies
the .name member to match a string in the "clock-names" DT property. We
shouldn't require that the index be >= 0 to make this use case work.

Fixes: 601b6e93304a ("clk: Allow parents to be specified via clkspec index")
Reported-by: Alexandre Mergnat <amergnat@...libre.com>
Cc: Jerome Brunet <jbrunet@...libre.com>
Cc: Chen-Yu Tsai <wens@...e.org>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
---
 drivers/clk/clk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index aa51756fd4d6..87b410d6e51d 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -368,7 +368,7 @@ static struct clk_core *clk_core_get(struct clk_core *core, u8 p_index)
 	const char *dev_id = dev ? dev_name(dev) : NULL;
 	struct device_node *np = core->of_node;
 
-	if (np && index >= 0)
+	if (np && (name || index >= 0))
 		hw = of_clk_get_hw(np, index, name);
 
 	/*
-- 
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