[PATCH 5/9] ata: sata_brcmstb: Allow optional reset controller to be used

[Florian Fainelli]

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@xxxxxxxxx>
---
 drivers/ata/ahci_brcm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index f3d557777d82..d535e87151dc 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 +413,10 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->top_ctrl))
 		return PTR_ERR(priv->top_ctrl);
 
+	priv->rcdev = of_reset_control_get(pdev->dev.of_node, NULL);
+	if (!IS_ERR(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;
@@ -464,6 +470,9 @@ static int brcm_ahci_remove(struct platform_device *pdev)
 
 	brcm_sata_phys_disable(priv);
 
+	if (!IS_ERR(priv->rcdev))
+		reset_control_assert(priv->rcdev);
+
 	return 0;
 }
 
-- 
2.17.1