[PATCH 1/2] net: allwinner: reset control support
From: Evgeny Boger <hidden>
Date: 2021-03-07 03:15:16
Also in:
linux-arm-kernel, lkml
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
R40 (aka V40/A40i/T3) and A10/A20 share the same EMAC IP. However, on R40 the EMAC is gated by default. Signed-off-by: Evgeny Boger <redacted> --- drivers/net/ethernet/allwinner/sun4i-emac.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 5ed80d9a6b9f..c0ae06dd922c 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c@@ -28,6 +28,7 @@ #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/phy.h> +#include <linux/reset.h> #include <linux/soc/sunxi/sunxi_sram.h> #include "sun4i-emac.h"
@@ -85,6 +86,7 @@ struct emac_board_info { unsigned int link; unsigned int speed; unsigned int duplex; + struct reset_control *reset; phy_interface_t phy_interface; };
@@ -791,6 +793,7 @@ static int emac_probe(struct platform_device *pdev) struct net_device *ndev; int ret = 0; const char *mac_addr; + struct reset_control *reset; ndev = alloc_etherdev(sizeof(struct emac_board_info)); if (!ndev) {
@@ -852,6 +855,19 @@ static int emac_probe(struct platform_device *pdev) goto out_release_sram; } + reset = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); + if (IS_ERR(reset)) { + dev_err(&pdev->dev, "unable to request reset\n"); + ret = -ENODEV; + goto out_release_sram; + } + db->reset = reset; + ret = reset_control_deassert(db->reset); + if (ret) { + dev_err(&pdev->dev, "could not deassert EMAC reset\n"); + goto out_release_sram; + } + /* Read MAC-address from DT */ mac_addr = of_get_mac_address(np); if (!IS_ERR(mac_addr))
@@ -881,7 +897,7 @@ static int emac_probe(struct platform_device *pdev) if (ret) { dev_err(&pdev->dev, "Registering netdev failed!\n"); ret = -ENODEV; - goto out_release_sram; + goto out_assert_reset; } dev_info(&pdev->dev, "%s: at %p, IRQ %d MAC: %pM\n",
@@ -889,6 +905,8 @@ static int emac_probe(struct platform_device *pdev) return 0; +out_assert_reset: + reset_control_assert(db->reset); out_release_sram: sunxi_sram_release(&pdev->dev); out_clk_disable_unprepare:
@@ -913,6 +931,7 @@ static int emac_remove(struct platform_device *pdev) unregister_netdev(ndev); sunxi_sram_release(&pdev->dev); clk_disable_unprepare(db->clk); + reset_control_assert(db->reset); irq_dispose_mapping(ndev->irq); iounmap(db->membase); free_netdev(ndev);
--
2.17.1