linux-kernel - [PATCH v2 2/7] phy: exynos5-usbdrd: use exynos_get_pmu_regmap_by

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

Message-Id: <20240501-usb-phy-gs101-v2-2-ed9f14a1bd6d@linaro.org>
Date: Wed, 01 May 2024 10:19:37 +0100
From: André Draszik <andre.draszik@...aro.org>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Peter Griffin <peter.griffin@...aro.org>, 
 Marek Szyprowski <m.szyprowski@...sung.com>, 
 Sylwester Nawrocki <s.nawrocki@...sung.com>, 
 Alim Akhtar <alim.akhtar@...sung.com>, 
 Sam Protsenko <semen.protsenko@...aro.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Will McVicker <willmcvicker@...gle.com>, Roy Luo <royluo@...gle.com>, 
 kernel-team@...roid.com, linux-phy@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 Arnd Bergmann <arnd@...db.de>, lee@...nel.org, 
 André Draszik <andre.draszik@...aro.org>
Subject: [PATCH v2 2/7] phy: exynos5-usbdrd: use
 exynos_get_pmu_regmap_by_phandle() for PMU regs

Some Exynos based SoCs like Tensor gs101 protect the PMU registers for
security hardening reasons so that they are only write accessible in
EL3 via an SMC call.

The Exynos PMU driver handles this transparently when using
exynos_get_pmu_regmap_by_phandle().

Switch to using that API to support such SoCs. As this driver now no
longer depends on mfd syscon remove that header and Kconfig dependency.

Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
 drivers/phy/samsung/Kconfig              | 1 -
 drivers/phy/samsung/phy-exynos5-usbdrd.c | 4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/samsung/Kconfig b/drivers/phy/samsung/Kconfig
index f10afa3d7ff5..bb63fa710803 100644
--- a/drivers/phy/samsung/Kconfig
+++ b/drivers/phy/samsung/Kconfig
@@ -82,7 +82,6 @@ config PHY_EXYNOS5_USBDRD
 	depends on HAS_IOMEM
 	depends on USB_DWC3_EXYNOS
 	select GENERIC_PHY
-	select MFD_SYSCON
 	default y
 	help
 	  Enable USB DRD PHY support for Exynos 5 SoC series.
diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
index 04171eed5b16..ac208b89f5a6 100644
--- a/drivers/phy/samsung/phy-exynos5-usbdrd.c
+++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c
@@ -18,9 +18,9 @@
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
 #include <linux/mutex.h>
-#include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
+#include <linux/soc/samsung/exynos-pmu.h>
 #include <linux/soc/samsung/exynos-regs-pmu.h>
 
 /* Exynos USB PHY registers */
@@ -1034,7 +1034,7 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	reg_pmu = syscon_regmap_lookup_by_phandle(dev->of_node,
+	reg_pmu = exynos_get_pmu_regmap_by_phandle(dev->of_node,
 						   "samsung,pmu-syscon");
 	if (IS_ERR(reg_pmu)) {
 		dev_err(dev, "Failed to lookup PMU regmap\n");

-- 
2.45.0.rc0.197.gbae5840b3b-goog