linux-kernel - [PATCH 1/1] clk: ti: am33xx: keep WKUP_DEBUGSS

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Message-ID: <20250825140812.2222185-1-alexander.stein@ew.tq-group.com>
Date: Mon, 25 Aug 2025 16:08:11 +0200
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Tero Kristo <kristo@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>
Cc: Matthias Schiffer <matthias.schiffer@...group.com>,
	linux-omap@...r.kernel.org,
	linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexander Stein <alexander.stein@...tq-group.com>
Subject: [PATCH 1/1] clk: ti: am33xx: keep WKUP_DEBUGSS_CLKCTRL enabled

From: Matthias Schiffer <matthias.schiffer@...group.com>

As described in AM335x Errata Advisory 1.0.42, WKUP_DEBUGSS_CLKCTRL
can't be disabled - the clock module will just be stuck in transitioning
state forever, resulting in the following warning message after the wait
loop times out:

    l3-aon-clkctrl:0000:0: failed to disable

Just add the clock to enable_init_clks, so no attempt is made to disable
it.

Signed-off-by: Matthias Schiffer <matthias.schiffer@...group.com>
Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
---
 drivers/clk/ti/clk-33xx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/ti/clk-33xx.c b/drivers/clk/ti/clk-33xx.c
index 85c50ea39e6da..9269e6a0db6a4 100644
--- a/drivers/clk/ti/clk-33xx.c
+++ b/drivers/clk/ti/clk-33xx.c
@@ -258,6 +258,8 @@ static const char *enable_init_clks[] = {
 	"dpll_ddr_m2_ck",
 	"dpll_mpu_m2_ck",
 	"l3_gclk",
+	/* WKUP_DEBUGSS_CLKCTRL - disable fails, AM335x Errata Advisory 1.0.42 */
+	"l3-aon-clkctrl:0000:0",
 	/* AM3_L3_L3_MAIN_CLKCTRL, needed during suspend */
 	"l3-clkctrl:00bc:0",
 	"l4hs_gclk",
-- 
2.43.0