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From: Michael Tretter <>
Subject: [PATCH v2 2/7] clk: zynqmp: do not enable already enabled clocks
Date: Thu, 24 Jun 2021 17:00:49 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

The pmu fw manages the permissions who can enable/disable the clocks.

There are a few clocks (TOPSW_LSBUS and LSBUS) which are exposed to
Barebox and Barebox assumes that is has to enable the clocks. However,
the pmu fw considers the clocks under its control and returns a
permission denied for the clock enable request.

Assume that clocks that are already enabled don't need to be enable by
Barebox to avoid the permission denied errors.

Signed-off-by: Michael Tretter <>

v2: none
 drivers/clk/zynqmp/clk-gate-zynqmp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/zynqmp/clk-gate-zynqmp.c b/drivers/clk/zynqmp/clk-gate-zynqmp.c
index a3b9ee21e506..493c1dfeaaa3 100644
--- a/drivers/clk/zynqmp/clk-gate-zynqmp.c
+++ b/drivers/clk/zynqmp/clk-gate-zynqmp.c
@@ -28,6 +28,9 @@ static int zynqmp_clk_gate_enable(struct clk_hw *hw)
 	struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
+	if (clk_hw_is_enabled(hw))
+		return 0;
 	return gate->ops->clock_enable(gate->clk_id);

barebox mailing list

  parent reply	other threads:[~2021-06-24 15:02 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24 15:00 [PATCH v2 0/7] ZynqMP: Cleanup and extend board support Michael Tretter
2021-06-24 15:00 ` [PATCH v2 1/7] ARM: zynqmp: set reset source Michael Tretter
2021-06-24 15:00 ` Michael Tretter [this message]
2021-06-24 15:00 ` [PATCH v2 3/7] dts: zcu104: add Barebox environment Michael Tretter
2021-06-24 15:00 ` [PATCH v2 4/7] ARM: zynqmp: add update handler Michael Tretter
2021-06-24 15:00 ` [PATCH v2 5/7] ARM: zynqmp: zcu104: register " Michael Tretter
2021-06-24 15:00 ` [PATCH v2 6/7] ARM: zynqmp: defconfig: enable more features Michael Tretter
2021-06-24 15:00 ` [PATCH v2 7/7] Documentation: zynqmp: add some documentation Michael Tretter
2021-06-25  7:39 ` [PATCH v2 0/7] ZynqMP: Cleanup and extend board support Sascha Hauer

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