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reset: microchip-sparx5: issue a reset on startup

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Originally this was used in by the switch core driver to issue a reset.
But it turns out, this isn't just a switch core reset but instead it
will reset almost the complete SoC.

Instead of adding almost all devices of the SoC a shared reset line,
issue the reset once early on startup. Keep the reset controller for
backwards compatibility, but make the actual reset a noop.

Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Michael Walle <michael@walle.cc>
Tested-by: Steen Hegelund <Steen.Hegelund@microchip.com> on Sparx5
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220826115607.1148489-2-michael@walle.cc
This commit is contained in:
Michael Walle 2022-08-26 13:56:05 +02:00 committed by Philipp Zabel
parent 051d9eb403
commit 51fd191422
1 changed files with 17 additions and 5 deletions
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22
drivers/reset/reset-microchip-sparx5.c
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@ -33,11 +33,8 @@ static struct regmap_config sparx5_reset_regmap_config = {
.reg_stride = 4,
};
static int sparx5_switch_reset(struct reset_controller_dev *rcdev,
unsigned long id)
static int sparx5_switch_reset(struct mchp_reset_context *ctx)
{
struct mchp_reset_context *ctx =
container_of(rcdev, struct mchp_reset_context, rcdev);
u32 val;
/* Make sure the core is PROTECTED from reset */
@ -54,8 +51,14 @@ static int sparx5_switch_reset(struct reset_controller_dev *rcdev,
1, 100);
}
static int sparx5_reset_noop(struct reset_controller_dev *rcdev,
unsigned long id)
{
return 0;
}
static const struct reset_control_ops sparx5_reset_ops = {
.reset = sparx5_switch_reset,
.reset = sparx5_reset_noop,
};
static int mchp_sparx5_map_syscon(struct platform_device *pdev, char *name,
@ -122,6 +125,11 @@ static int mchp_sparx5_reset_probe(struct platform_device *pdev)
ctx->rcdev.of_node = dn;
ctx->props = device_get_match_data(&pdev->dev);
/* Issue the reset very early, our actual reset callback is a noop. */
err = sparx5_switch_reset(ctx);
if (err)
return err;
return devm_reset_controller_register(&pdev->dev, &ctx->rcdev);
}
@ -163,6 +171,10 @@ static int __init mchp_sparx5_reset_init(void)
return platform_driver_register(&mchp_sparx5_reset_driver);
}
/*
* Because this is a global reset, keep this postcore_initcall() to issue the
* reset as early as possible during the kernel startup.
*/
postcore_initcall(mchp_sparx5_reset_init);
MODULE_DESCRIPTION("Microchip Sparx5 switch reset driver");