mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 18:47:06 +00:00
55 lines
1.9 KiB
Diff
55 lines
1.9 KiB
Diff
|
From 72bc31aa621e21a7c36a7da8aa6f6a77bb234e0b Mon Sep 17 00:00:00 2001
|
||
|
|
From: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
|
||
|
|
Date: Wed, 6 Jul 2022 15:41:29 +0200
|
||
|
|
Subject: [PATCH] clk: qcom: reset: Allow specifying custom reset delay
|
||
|
|
|
||
|
|
The amount of time required between asserting and deasserting the reset
|
||
|
|
signal can vary depending on the involved hardware component. Sometimes
|
||
|
|
1 us might not be enough and a larger delay is necessary to conform to
|
||
|
|
the specifications.
|
||
|
|
|
||
|
|
Usually this is worked around in the consuming drivers, by replacing
|
||
|
|
reset_control_reset() with a sequence of reset_control_assert(), waiting
|
||
|
|
for a custom delay, followed by reset_control_deassert().
|
||
|
|
|
||
|
|
However, in some cases the driver making use of the reset is generic and
|
||
|
|
can be used with different reset controllers. In this case the reset
|
||
|
|
time requirement is better handled directly by the reset controller
|
||
|
|
driver.
|
||
|
|
|
||
|
|
Make this possible by adding an "udelay" field to the qcom_reset_map
|
||
|
|
that allows setting a different reset delay (in microseconds).
|
||
|
|
|
||
|
|
Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
|
||
|
|
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
|
||
|
|
Link: https://lore.kernel.org/r/20220706134132.3623415-4-stephan.gerhold@kernkonzept.com
|
||
|
|
---
|
||
|
|
drivers/clk/qcom/reset.c | 4 +++-
|
||
|
|
drivers/clk/qcom/reset.h | 1 +
|
||
|
|
2 files changed, 4 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
--- a/drivers/clk/qcom/reset.c
|
||
|
|
+++ b/drivers/clk/qcom/reset.c
|
||
|
|
@@ -13,8 +13,10 @@
|
||
|
|
|
||
|
|
static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
|
||
|
|
{
|
||
|
|
+ struct qcom_reset_controller *rst = to_qcom_reset_controller(rcdev);
|
||
|
|
+
|
||
|
|
rcdev->ops->assert(rcdev, id);
|
||
|
|
- udelay(1);
|
||
|
|
+ udelay(rst->reset_map[id].udelay ?: 1); /* use 1 us as default */
|
||
|
|
rcdev->ops->deassert(rcdev, id);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
--- a/drivers/clk/qcom/reset.h
|
||
|
|
+++ b/drivers/clk/qcom/reset.h
|
||
|
|
@@ -11,6 +11,7 @@
|
||
|
|
struct qcom_reset_map {
|
||
|
|
unsigned int reg;
|
||
|
|
u8 bit;
|
||
|
|
+ u8 udelay;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct regmap;
|