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net: mdio: add reset control for Aspeed MDIO

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Add reset assertion/deassertion for Aspeed MDIO.  There are 4 MDIO
controllers embedded in Aspeed AST2600 SOC and share one reset control
register SCU50[3].  To work with old DT blobs which don't have the reset
property, devm_reset_control_get_optional_shared is used in this change.

Signed-off-by: Dylan Hung <dylan_hung@aspeedtech.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Dylan Hung 2022-04-27 11:55:00 +08:00 committed by Paolo Abeni
parent 65e42ad98e
commit 1585362250
1 changed files with 14 additions and 1 deletions
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15
drivers/net/mdio/mdio-aspeed.c
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@ -3,6 +3,7 @@
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/reset.h>
#include <linux/iopoll.h>
#include <linux/mdio.h>
#include <linux/module.h>
@ -41,6 +42,7 @@
struct aspeed_mdio {
void __iomem *base;
struct reset_control *reset;
};
static int aspeed_mdio_op(struct mii_bus *bus, u8 st, u8 op, u8 phyad, u8 regad,
@ -174,6 +176,12 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
if (IS_ERR(ctx->base))
return PTR_ERR(ctx->base);
ctx->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
if (IS_ERR(ctx->reset))
return PTR_ERR(ctx->reset);
reset_control_deassert(ctx->reset);
bus->name = DRV_NAME;
snprintf(bus->id, MII_BUS_ID_SIZE, "%s%d", pdev->name, pdev->id);
bus->parent = &pdev->dev;
@ -184,6 +192,7 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
rc = of_mdiobus_register(bus, pdev->dev.of_node);
if (rc) {
dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
reset_control_assert(ctx->reset);
return rc;
}
@ -194,7 +203,11 @@ static int aspeed_mdio_probe(struct platform_device *pdev)
static int aspeed_mdio_remove(struct platform_device *pdev)
{
mdiobus_unregister(platform_get_drvdata(pdev));
struct mii_bus *bus = (struct mii_bus *)platform_get_drvdata(pdev);
struct aspeed_mdio *ctx = bus->priv;
reset_control_assert(ctx->reset);
mdiobus_unregister(bus);
return 0;
}