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From:   Florian Fainelli <f.fainelli@gmail.com>
To:     linux-kernel@vger.kernel.org
Cc:     bcm-kernel-feedback-list@broadcom.com,
        Florian Fainelli <f.fainelli@gmail.com>,
        Jens Axboe <axboe@kernel.dk>, Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        linux-ide@vger.kernel.org (open list:LIBATA SUBSYSTEM (Serial and
        Parallel ATA drivers)),
        devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS)
Subject: [PATCH v2 2/4] ata: ahci_brcm: Allow optional reset controller to be used
Date:   Mon,  1 Oct 2018 10:33:00 -0700
Message-Id: <20181001173302.25398-3-f.fainelli@gmail.com>
In-Reply-To: <20181001173302.25398-1-f.fainelli@gmail.com>
References: <20181001173302.25398-1-f.fainelli@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On BCM63138, we need to reset the AHCI core prior to start utilizing it,
grab the reset controller device cookie and do that.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/ata/ahci_brcm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index f3d557777d82..0e401b7c0856 100644
--- a/drivers/ata/ahci_brcm.c
+++ b/drivers/ata/ahci_brcm.c
@@ -25,6 +25,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/reset.h>
 #include <linux/string.h>
 
 #include "ahci.h"
@@ -94,6 +95,7 @@ struct brcm_ahci_priv {
 	u32 port_mask;
 	u32 quirks;
 	enum brcm_ahci_version version;
+	struct reset_control *rcdev;
 };
 
 static inline u32 brcm_sata_readreg(void __iomem *addr)
@@ -411,6 +413,11 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->top_ctrl))
 		return PTR_ERR(priv->top_ctrl);
 
+	/* Reset is optional depending on platform */
+	priv->rcdev = devm_reset_control_get(&pdev->dev, "ahci");
+	if (!IS_ERR_OR_NULL(priv->rcdev))
+		reset_control_deassert(priv->rcdev);
+
 	if ((priv->version == BRCM_SATA_BCM7425) ||
 		(priv->version == BRCM_SATA_NSP)) {
 		priv->quirks |= BRCM_AHCI_QUIRK_NO_NCQ;
-- 
2.17.1