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55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
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From 72bc31aa621e21a7c36a7da8aa6f6a77bb234e0b Mon Sep 17 00:00:00 2001
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From: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
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Date: Wed, 6 Jul 2022 15:41:29 +0200
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Subject: [PATCH] clk: qcom: reset: Allow specifying custom reset delay
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The amount of time required between asserting and deasserting the reset
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signal can vary depending on the involved hardware component. Sometimes
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1 us might not be enough and a larger delay is necessary to conform to
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the specifications.
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Usually this is worked around in the consuming drivers, by replacing
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reset_control_reset() with a sequence of reset_control_assert(), waiting
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for a custom delay, followed by reset_control_deassert().
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However, in some cases the driver making use of the reset is generic and
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can be used with different reset controllers. In this case the reset
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time requirement is better handled directly by the reset controller
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driver.
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Make this possible by adding an "udelay" field to the qcom_reset_map
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that allows setting a different reset delay (in microseconds).
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Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
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Signed-off-by: Bjorn Andersson <andersson@kernel.org>
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Link: https://lore.kernel.org/r/20220706134132.3623415-4-stephan.gerhold@kernkonzept.com
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---
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drivers/clk/qcom/reset.c | 4 +++-
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drivers/clk/qcom/reset.h | 1 +
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2 files changed, 4 insertions(+), 1 deletion(-)
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--- a/drivers/clk/qcom/reset.c
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+++ b/drivers/clk/qcom/reset.c
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@@ -13,8 +13,10 @@
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static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
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{
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+ struct qcom_reset_controller *rst = to_qcom_reset_controller(rcdev);
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+
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rcdev->ops->assert(rcdev, id);
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- udelay(1);
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+ udelay(rst->reset_map[id].udelay ?: 1); /* use 1 us as default */
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rcdev->ops->deassert(rcdev, id);
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return 0;
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}
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--- a/drivers/clk/qcom/reset.h
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+++ b/drivers/clk/qcom/reset.h
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@@ -11,6 +11,7 @@
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struct qcom_reset_map {
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unsigned int reg;
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u8 bit;
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+ u8 udelay;
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};
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struct regmap;
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