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[37.66.31.39]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4834d82a4c4sm143519295e9.10.2026.02.10.11.33.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Feb 2026 11:33:31 -0800 (PST) From: =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= Date: Tue, 10 Feb 2026 20:32:52 +0100 Subject: [PATCH v9 1/3] dt-bindings: stm32: stm32mp25: add `#access-controller-cells` property Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260210-b4-rcc-upstream-v9-1-17ca1db7613f@gmail.com> References: <20260210-b4-rcc-upstream-v9-0-17ca1db7613f@gmail.com> In-Reply-To: <20260210-b4-rcc-upstream-v9-0-17ca1db7613f@gmail.com> To: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Gabriel Fernandez Cc: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= , =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= X-Mailer: b4 0.15-dev-47773 From: Cl=C3=A9ment Le Goffic RCC is able to check the availability of a clock. Allow to query the RCC with a firewall ID. Signed-off-by: Cl=C3=A9ment Le Goffic Acked-by: Rob Herring (Arm) Signed-off-by: Cl=C3=A9ment Le Goffic --- Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml = b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml index 1e3b5d218bb0..882de8608200 100644 --- a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml +++ b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml @@ -31,6 +31,11 @@ properties: '#reset-cells': const: 1 =20 + '#access-controller-cells': + const: 1 + description: + Contains the firewall ID associated to the peripheral. + clocks: items: - description: CK_SCMI_HSE High Speed External oscillator (8 to 48 M= Hz) @@ -122,6 +127,7 @@ required: - reg - '#clock-cells' - '#reset-cells' + - '#access-controller-cells' - clocks =20 additionalProperties: false @@ -135,6 +141,7 @@ examples: reg =3D <0x44200000 0x10000>; #clock-cells =3D <1>; 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[37.66.31.39]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4834d7d55c9sm75779815e9.8.2026.02.10.11.33.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Feb 2026 11:33:31 -0800 (PST) From: =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= Date: Tue, 10 Feb 2026 20:32:53 +0100 Subject: [PATCH v9 2/3] clk: stm32mp25: add firewall grant_access ops Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260210-b4-rcc-upstream-v9-2-17ca1db7613f@gmail.com> References: <20260210-b4-rcc-upstream-v9-0-17ca1db7613f@gmail.com> In-Reply-To: <20260210-b4-rcc-upstream-v9-0-17ca1db7613f@gmail.com> To: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Gabriel Fernandez Cc: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= , =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= X-Mailer: b4 0.15-dev-47773 From: Cl=C3=A9ment Le Goffic On STM32MP25, the RCC peripheral manages the secure level of resources that are used by other devices such as clocks. Declare this peripheral as a firewall controller. Signed-off-by: Cl=C3=A9ment Le Goffic Reviewed-by: Gabriel Fernandez Signed-off-by: Cl=C3=A9ment Le Goffic --- drivers/clk/stm32/clk-stm32mp25.c | 40 +++++++++++++++++++++++++++++++++++= +++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/clk/stm32/clk-stm32mp25.c b/drivers/clk/stm32/clk-stm3= 2mp25.c index 52f0e8a12926..af4bc06d703a 100644 --- a/drivers/clk/stm32/clk-stm32mp25.c +++ b/drivers/clk/stm32/clk-stm32mp25.c @@ -4,8 +4,10 @@ * Author: Gabriel Fernandez for STMicroel= ectronics. */ =20 +#include #include #include +#include #include #include =20 @@ -1602,6 +1604,11 @@ static int stm32_rcc_get_access(void __iomem *base, = u32 index) return 0; } =20 +static int stm32mp25_rcc_grant_access(struct stm32_firewall_controller *ct= rl, u32 firewall_id) +{ + return stm32_rcc_get_access(ctrl->mmio, firewall_id); +} + static int stm32mp25_check_security(struct device_node *np, void __iomem *= base, const struct clock_config *cfg) { @@ -1970,6 +1977,7 @@ MODULE_DEVICE_TABLE(of, stm32mp25_match_data); =20 static int stm32mp25_rcc_clocks_probe(struct platform_device *pdev) { + struct stm32_firewall_controller *rcc_controller; struct device *dev =3D &pdev->dev; void __iomem *base; int ret; @@ -1982,7 +1990,36 @@ static int stm32mp25_rcc_clocks_probe(struct platfor= m_device *pdev) if (ret) return ret; =20 - return stm32_rcc_init(dev, stm32mp25_match_data, base); + ret =3D stm32_rcc_init(dev, stm32mp25_match_data, base); + if (ret) + return ret; + + rcc_controller =3D devm_kzalloc(&pdev->dev, sizeof(*rcc_controller), GFP_= KERNEL); + if (!rcc_controller) + return -ENOMEM; + + rcc_controller->dev =3D dev; + rcc_controller->mmio =3D base; + rcc_controller->name =3D dev_driver_string(dev); + rcc_controller->type =3D STM32_PERIPHERAL_FIREWALL; + rcc_controller->grant_access =3D stm32mp25_rcc_grant_access; + + platform_set_drvdata(pdev, rcc_controller); + + ret =3D stm32_firewall_controller_register(rcc_controller); + if (ret) { + dev_err(dev, "Couldn't register as a firewall controller: %d\n", ret); + return ret; + } + + return 0; +} + +static void stm32mp25_rcc_clocks_remove(struct platform_device *pdev) +{ + struct stm32_firewall_controller *rcc_controller =3D platform_get_drvdata= (pdev); + + stm32_firewall_controller_unregister(rcc_controller); } =20 static struct platform_driver stm32mp25_rcc_clocks_driver =3D { @@ -1991,6 +2028,7 @@ static struct platform_driver stm32mp25_rcc_clocks_dr= iver =3D { .of_match_table =3D stm32mp25_match_data, }, .probe =3D stm32mp25_rcc_clocks_probe, + .remove =3D stm32mp25_rcc_clocks_remove, }; =20 static int __init stm32mp25_clocks_init(void) --=20 2.53.0 From nobody Thu Apr 2 10:57:38 2026 Received: from mail-wm1-f46.google.com (mail-wm1-f46.google.com [209.85.128.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E231632E727 for ; Tue, 10 Feb 2026 19:33:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.46 ARC-Seal: i=1; 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[37.66.31.39]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4376d3a32basm19835831f8f.14.2026.02.10.11.33.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Feb 2026 11:33:32 -0800 (PST) From: =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= Date: Tue, 10 Feb 2026 20:32:54 +0100 Subject: [PATCH v9 3/3] arm64: dts: st: set RCC as an access-controller Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260210-b4-rcc-upstream-v9-3-17ca1db7613f@gmail.com> References: <20260210-b4-rcc-upstream-v9-0-17ca1db7613f@gmail.com> In-Reply-To: <20260210-b4-rcc-upstream-v9-0-17ca1db7613f@gmail.com> To: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Maxime Coquelin , Alexandre Torgue , Gabriel Fernandez Cc: linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= , =?utf-8?q?Cl=C3=A9ment_Le_Goffic?= X-Mailer: b4 0.15-dev-47773 From: Cl=C3=A9ment Le Goffic RCC now implements firewall access ops to check the access to resources. Allow client nodes to query the RCC with one firewall ID. Signed-off-by: Cl=C3=A9ment Le Goffic Signed-off-by: Cl=C3=A9ment Le Goffic --- arch/arm64/boot/dts/st/stm32mp231.dtsi | 1 + arch/arm64/boot/dts/st/stm32mp251.dtsi | 1 + 2 files changed, 2 insertions(+) diff --git a/arch/arm64/boot/dts/st/stm32mp231.dtsi b/arch/arm64/boot/dts/s= t/stm32mp231.dtsi index 88e214d395ab..e283c760d94f 100644 --- a/arch/arm64/boot/dts/st/stm32mp231.dtsi +++ b/arch/arm64/boot/dts/st/stm32mp231.dtsi @@ -776,6 +776,7 @@ rcc: clock-controller@44200000 { reg =3D <0x44200000 0x10000>; #clock-cells =3D <1>; #reset-cells =3D <1>; + #access-controller-cells =3D <1>; clocks =3D <&scmi_clk CK_SCMI_HSE>, <&scmi_clk CK_SCMI_HSI>, <&scmi_clk CK_SCMI_MSI>, diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/s= t/stm32mp251.dtsi index a8e6e0f77b83..89e0b8f2fbf9 100644 --- a/arch/arm64/boot/dts/st/stm32mp251.dtsi +++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi @@ -1761,6 +1761,7 @@ rcc: clock-controller@44200000 { reg =3D <0x44200000 0x10000>; #clock-cells =3D <1>; #reset-cells =3D <1>; + #access-controller-cells =3D <1>; clocks =3D <&scmi_clk CK_SCMI_HSE>, <&scmi_clk CK_SCMI_HSI>, <&scmi_clk CK_SCMI_MSI>, --=20 2.53.0