linux-kernel - [PATCH 4/5] mtd: onenand: samsung: Make sure that bus clock is enabled

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CY4PR04MB056777077970A6935BC6349BCBF69@CY4PR04MB0567.namprd04.prod.outlook.com>
Date:   Fri, 22 Apr 2022 20:46:21 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        Tomasz Figa <tomasz.figa@...il.com>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        Jonathan Bakker <xc-racer2@...e.ca>
Subject: [PATCH 4/5] mtd: onenand: samsung: Make sure that bus clock is enabled

From: Tomasz Figa <tomasz.figa@...il.com>

This patch adds basic handling of controller bus clock to make sure that
in device probe it is enabled and device can operate correctly. The
clock is optional and driver behavior is identical as before this patch
if not provided.

Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
---
 drivers/mtd/nand/onenand/onenand_samsung.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mtd/nand/onenand/onenand_samsung.c b/drivers/mtd/nand/onenand/onenand_samsung.c
index a3ef4add865a..62014f8d27b6 100644
--- a/drivers/mtd/nand/onenand/onenand_samsung.c
+++ b/drivers/mtd/nand/onenand/onenand_samsung.c
@@ -11,6 +11,7 @@
  *	S5PC110: use DMA
  */
 
+#include <linux/clk.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/sched.h>
@@ -122,6 +123,7 @@ enum soc_type {
 struct s3c_onenand {
 	struct mtd_info	*mtd;
 	struct platform_device	*pdev;
+	struct clk	*clk_bus;
 	enum soc_type	type;
 	void __iomem	*ctrl_base;
 	void __iomem	*chip_base;
@@ -914,6 +916,10 @@ static int s3c_onenand_probe(struct platform_device *pdev)
 		}
 	}
 
+	onenand->clk_bus = devm_clk_get(&pdev->dev, "bus");
+	if (!IS_ERR(onenand->clk_bus))
+		clk_prepare_enable(onenand->clk_bus);
+
 	err = onenand_scan(mtd, 1);
 	if (err)
 		return err;
@@ -945,6 +951,8 @@ static int s3c_onenand_remove(struct platform_device *pdev)
 	struct mtd_info *mtd = platform_get_drvdata(pdev);
 
 	onenand_release(mtd);
+	if (!IS_ERR(onenand->clk_bus))
+		clk_disable_unprepare(onenand->clk_bus);
 
 	return 0;
 }
-- 
2.30.2