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[81.5.99.6]) by smtp.gmail.com with ESMTPSA id u16sm847582lff.169.2021.03.06.19.14.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 06 Mar 2021 19:14:15 -0800 (PST) From: Evgeny Boger To: Maxime Ripard , Chen-Yu Tsai , linux-arm-kernel@lists.infradead.org Cc: Evgeny Boger , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring Subject: [PATCH 1/2] net: allwinner: reset control support Date: Sun, 7 Mar 2021 06:13:51 +0300 Message-Id: <20210307031353.12643-2-boger@wirenboard.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210307031353.12643-1-boger@wirenboard.com> References: <20210307031353.12643-1-boger@wirenboard.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210307_031417_038354_4041F01F X-CRM114-Status: GOOD ( 14.98 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- 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 #include #include +#include #include #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);