[PATCH v2 2/4] ata: ahci_brcm: 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.faine...@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