linux-kernel - [PATCH 02/15] ahci_brcm: fix use of BCM7216 reset controller

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Date:   Tue, 19 May 2020 16:34:00 -0400
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     james.quinlan@...adcom.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Jim Quinlan <james.quinlan@...adcom.com>,
        Jens Axboe <axboe@...nel.dk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-ide@...r.kernel.org (open list:LIBATA SUBSYSTEM (Serial and
        Parallel ATA drivers)), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 02/15] ahci_brcm: fix use of BCM7216 reset controller

From: Jim Quinlan <jquinlan@...adcom.com>

A reset controller "rescal" is shared between the AHCI driver
and the PCIe driver for the BrcmSTB 7216 chip.  The code is
modified to allow this sharing and to deassert() properly.

Signed-off-by: Jim Quinlan <jquinlan@...adcom.com>
---
 drivers/ata/ahci_brcm.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/ata/ahci_brcm.c b/drivers/ata/ahci_brcm.c
index 6853dbb4131d..a3c32fc29e9c 100644
--- a/drivers/ata/ahci_brcm.c
+++ b/drivers/ata/ahci_brcm.c
@@ -428,7 +428,6 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *of_id;
 	struct device *dev = &pdev->dev;
-	const char *reset_name = NULL;
 	struct brcm_ahci_priv *priv;
 	struct ahci_host_priv *hpriv;
 	struct resource *res;
@@ -452,11 +451,11 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 
 	/* Reset is optional depending on platform and named differently */
 	if (priv->version == BRCM_SATA_BCM7216)
-		reset_name = "rescal";
+		priv->rcdev = devm_reset_control_get_shared(&pdev->dev,
+							    "rescal");
 	else
-		reset_name = "ahci";
-
-	priv->rcdev = devm_reset_control_get_optional(&pdev->dev, reset_name);
+		priv->rcdev = devm_reset_control_get_optional(&pdev->dev,
+							      "ahci");
 	if (IS_ERR(priv->rcdev))
 		return PTR_ERR(priv->rcdev);
 
@@ -479,10 +478,7 @@ static int brcm_ahci_probe(struct platform_device *pdev)
 		break;
 	}
 
-	if (priv->version == BRCM_SATA_BCM7216)
-		ret = reset_control_reset(priv->rcdev);
-	else
-		ret = reset_control_deassert(priv->rcdev);
+	ret = reset_control_deassert(priv->rcdev);
 	if (ret)
 		return ret;
 
-- 
2.17.1