linux-kernel - [PATCH 1/2] clk: st: clkgen-fsyn: search reg within node or parent

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Date:   Thu,  2 Dec 2021 08:28:49 +0100
From:   Alain Volmat <avolmat@...com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Patrice Chotard <patrice.chotard@...s.st.com>
Cc:     Lee Jones <lee.jones@...aro.org>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, Alain Volmat <avolmat@...com>
Subject: [PATCH 1/2] clk: st: clkgen-fsyn: search reg within node or parent

In order to avoid having duplicated addresses within the DT,
only have one unit-address per clockgen and each driver within
the clockgen should look at the parent node (overall clockgen)
to figure out the reg property.  Such behavior is already in
place in other STi platform clock drivers such as clk-flexgen
and clkgen-pll.  Keep backward compatibility by first looking
at reg within the node before looking into the parent node.

Signed-off-by: Alain Volmat <avolmat@...com>
---
 drivers/clk/st/clkgen-fsyn.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/st/clkgen-fsyn.c b/drivers/clk/st/clkgen-fsyn.c
index 164285d6be97..0d41164f2c7f 100644
--- a/drivers/clk/st/clkgen-fsyn.c
+++ b/drivers/clk/st/clkgen-fsyn.c
@@ -988,9 +988,16 @@ static void __init st_of_quadfs_setup(struct device_node *np,
 	void __iomem *reg;
 	spinlock_t *lock;
 
+	/*
+	 * First check for reg property within the node to keep backward
+	 * compatibility, then if reg doesn't exist look at the parent node
+	 */
 	reg = of_iomap(np, 0);
-	if (!reg)
-		return;
+	if (!reg) {
+		reg = of_iomap(of_get_parent(np), 0);
+		if (!reg)
+			return;
+	}
 
 	clk_parent_name = of_clk_get_parent_name(np, 0);
 	if (!clk_parent_name)
-- 
2.25.1