linux-kernel - [PATCH] mfd: max77620: Use single-byte writes on MAX77620

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: <20200417170913.2552327-1-thierry.reding@gmail.com>
Date:   Fri, 17 Apr 2020 19:09:13 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Jon Hunter <jonathanh@...dia.com>, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mfd: max77620: Use single-byte writes on MAX77620

From: Thierry Reding <treding@...dia.com>

The MAX77620 doesn't support bulk writes, so make sure the regmap code
breaks bulk writes into multiple single-byte writes.

Note that this is mostly cosmetic because currently only the RTC sub-
driver uses bulk writes and the RTC driver ends up using a different
regmap on the MAX77620 anyway. However, it seems like a good idea to
make this change now in order to avoid running into issues if bulk
writes are ever used by other sub-drivers sometime down the road.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/mfd/max77620.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mfd/max77620.c b/drivers/mfd/max77620.c
index c7ed5c353553..fec2096474ad 100644
--- a/drivers/mfd/max77620.c
+++ b/drivers/mfd/max77620.c
@@ -177,6 +177,7 @@ static const struct regmap_config max77620_regmap_config = {
 	.rd_table = &max77620_readable_table,
 	.wr_table = &max77620_writable_table,
 	.volatile_table = &max77620_volatile_table,
+	.use_single_write = true,
 };

 static const struct regmap_config max20024_regmap_config = {
-- 
2.24.1