Add reset deassertion for Aspeed MDIO. There are 4 MDIO controllers embedded in Aspeed AST2600 SOC and share one reset control register SCU50[3]. So devm_reset_control_get_shared is used in this change.
Signed-off-by: Dylan Hung dylan_hung@aspeedtech.com Cc: stable@vger.kernel.org --- drivers/net/mdio/mdio-aspeed.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-aspeed.c index e2273588c75b..8ac262a12d13 100644 --- a/drivers/net/mdio/mdio-aspeed.c +++ b/drivers/net/mdio/mdio-aspeed.c @@ -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> @@ -37,6 +38,7 @@
struct aspeed_mdio { void __iomem *base; + struct reset_control *reset; };
static int aspeed_mdio_read(struct mii_bus *bus, int addr, int regnum) @@ -120,6 +122,12 @@ 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_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;