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ARM: imx: register reset controller from a platform driver 

Starting with commit 6b2117ad65 ("of: property: fw_devlink: Add
support for "resets" and "pwms""), the imx-drm driver fails to load
due to forever dormant devlinks to the reset-controller node. This
node was never associated with a struct device.

Add a platform device to allow fw_devnode to activate the devlinks.

Fixes: 6b2117ad65 ("of: property: fw_devlink: Add support for "resets" and "pwms"")
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Saravana Kannan <saravanak@google.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Philipp Zabel 2021-10-05 12:06:18 +02:00 committed by Shawn Guo
parent 3518441dda
commit a1467faa10
1 changed files with 31 additions and 9 deletions
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40
arch/arm/mach-imx/src.c
View File

@ -9,6 +9,7 @@
#include <linux/iopoll.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/smp.h>
#include <asm/smp_plat.h>
@ -81,11 +82,6 @@ static const struct reset_control_ops imx_src_ops = {
.reset = imx_src_reset_module,
};
static struct reset_controller_dev imx_reset_controller = {
.ops = &imx_src_ops,
.nr_resets = ARRAY_SIZE(sw_reset_bits),
};
static void imx_gpcv2_set_m_core_pgc(bool enable, u32 offset)
{
writel_relaxed(enable, gpc_base + offset);
@ -177,10 +173,6 @@ void __init imx_src_init(void)
src_base = of_iomap(np, 0);
WARN_ON(!src_base);
imx_reset_controller.of_node = np;
if (IS_ENABLED(CONFIG_RESET_CONTROLLER))
reset_controller_register(&imx_reset_controller);
/*
* force warm reset sources to generate cold reset
* for a more reliable restart
@ -214,3 +206,33 @@ void __init imx7_src_init(void)
if (!gpc_base)
return;
}
static const struct of_device_id imx_src_dt_ids[] = {
{ .compatible = "fsl,imx51-src" },
{ /* sentinel */ }
};
static int imx_src_probe(struct platform_device *pdev)
{
struct reset_controller_dev *rcdev;
rcdev = devm_kzalloc(&pdev->dev, sizeof(*rcdev), GFP_KERNEL);
if (!rcdev)
return -ENOMEM;
rcdev->ops = &imx_src_ops;
rcdev->dev = &pdev->dev;
rcdev->of_node = pdev->dev.of_node;
rcdev->nr_resets = ARRAY_SIZE(sw_reset_bits);
return devm_reset_controller_register(&pdev->dev, rcdev);
}
static struct platform_driver imx_src_driver = {
.driver = {
.name = "imx-src",
.of_match_table = imx_src_dt_ids,
},
.probe = imx_src_probe,
};
builtin_platform_driver(imx_src_driver);