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Subject[PATCH 1/2] net: allwinner: reset control support
Date
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 <boger@wirenboard.com>
---
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
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