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Thu, 22 Jan 2026 15:14:47 +0100 Received: from [10.48.86.212] (10.48.86.212) by STKDAG1NODE2.st.com (10.75.128.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Thu, 22 Jan 2026 15:13:25 +0100 Message-ID: Date: Thu, 22 Jan 2026 15:13:15 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 03/12] dt-bindings: bus: document the stm32 debug bus To: Rob Herring CC: Suzuki K Poulose , Mike Leach , James Clark , "Krzysztof Kozlowski" , Conor Dooley , "Mathieu Poirier" , Leo Yan , =?UTF-8?Q?Cl=C3=A9ment_Le_Goffic?= , "Linus Walleij" , Maxime Coquelin , Alexandre Torgue , , , , , , , References: <20260121-debug_bus-v3-0-4d32451180d0@foss.st.com> <20260121-debug_bus-v3-3-4d32451180d0@foss.st.com> <20260121152124.GA3179930-robh@kernel.org> Content-Language: en-US From: Gatien CHEVALLIER In-Reply-To: <20260121152124.GA3179930-robh@kernel.org> Content-Type: text/plain; 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X-OriginatorOrg: foss.st.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jan 2026 14:13:26.9171 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4b8071ce-e120-4049-bdb1-08de59c06965 X-MS-Exchange-CrossTenant-Id: 75e027c9-20d5-47d5-b82f-77d7cd041e8f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=75e027c9-20d5-47d5-b82f-77d7cd041e8f;Ip=[164.130.1.60];Helo=[smtpO365.st.com] X-MS-Exchange-CrossTenant-AuthSource: AM2PEPF0001C717.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR10MB3615 X-Proofpoint-ORIG-GUID: l2doOy_TilBDbXkdaYl7n3W4DWq-Ay-f X-Proofpoint-GUID: l2doOy_TilBDbXkdaYl7n3W4DWq-Ay-f X-Authority-Analysis: v=2.4 cv=HbUZjyE8 c=1 sm=1 tr=0 ts=6972308c cx=c_pps a=wstiicNh2/SfyO08CDRWbg==:117 a=uCuRqK4WZKO1kjFMGfU4lQ==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=rg8MelPR9j8A:10 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=s63m1ICgrNkA:10 a=KrXZwBdWH7kA:10 a=VkNPw1HP01LnGYTKEx00:22 a=gEfo2CItAAAA:8 a=8b9GpE9nAAAA:8 a=Uy8sdeCgRwOuE3k0pAgA:9 a=QEXdDO2ut3YA:10 a=sptkURWiP4Gy88Gu7hUp:22 a=T3LWEMljR5ZiDmsYVIUa:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTIyMDEwNyBTYWx0ZWRfX4VlssI3bAhZ/ bQtpT1djEn5dCpJxuYajERi76o/ndWmx9CtCPjBNzEbzZ+SaosfJFRtczDMG+AWw/MaT4d4ZVWC 2F7F9tGvHqKWmHPpAQQIWi9bHSWxDIfurhAJKOBmSUWWhzEymG4E3yxUKS/e9d7lvFIR6SbYqzZ +wxr+OjQSGF1WAUn4pVL1jOGiUnQS4bMo+MiD84XKxMNK10W7J10Fv1YqZ1L7V/BU9/lXpWwrRC GvicBq8AY7fY6U1OQscb8v7VYtfvL+UUKvl+J3IHQUeuVEhChpgf98Rju+Y9NxrxNJny0w/kadH 2wmblg5kDgyllV3uy1xvgHdfsl2KD7L8AI7GaGoi53aUowbHFjXOdkUPnOyLka6VWJ4Jxp3uMbe JSrWjvCnAiWExN0RJnaLexGllPu5QrLbAhHEa26cs7yCsv7zikFGJBAxyLBNLFKcIvYVoz8Dpoq TxVcwWC9RN+OrZabd1w== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.20,FMLib:17.12.100.49 definitions=2026-01-22_01,2026-01-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 priorityscore=1501 spamscore=0 phishscore=0 lowpriorityscore=0 impostorscore=0 malwarescore=0 bulkscore=0 clxscore=1015 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2601220107 On 1/21/26 16:21, Rob Herring wrote: > On Wed, Jan 21, 2026 at 01:34:37PM +0100, Gatien Chevallier wrote: >> Document the stm32 debug bus. The debug bus is responsible for >> checking the debug sub-system accessibility before probing any related >> drivers. >> >> Signed-off-by: Gatien Chevallier >> --- >> .../bindings/bus/st,stm32mp131-dbg-bus.yaml | 79 ++++++++++++++++++++++ >> 1 file changed, 79 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/bus/st,stm32mp131-dbg-bus.yaml b/Documentation/devicetree/bindings/bus/st,stm32mp131-dbg-bus.yaml >> new file mode 100644 >> index 000000000000..2db35e41e76c >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/bus/st,stm32mp131-dbg-bus.yaml >> @@ -0,0 +1,79 @@ >> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >> +%YAML 1.2 >> +--- >> +$id: http://devicetree.org/schemas/bus/st,stm32mp131-dbg-bus.yaml# >> +$schema: http://devicetree.org/meta-schemas/core.yaml# >> + >> +title: STM32 Coresight bus >> + >> +maintainers: >> + - Gatien Chevallier >> + >> +description: >> + The STM32 debug bus is in charge of checking the debug configuration >> + of the platform before probing the peripheral drivers that rely on the debug >> + domain. >> + >> +properties: >> + compatible: >> + items: >> + - enum: >> + - st,stm32mp131-dbg-bus >> + - st,stm32mp151-dbg-bus >> + >> + "#address-cells": >> + const: 1 >> + >> + "#size-cells": >> + const: 1 >> + >> + ranges: true >> + >> + reg: >> + maxItems: 1 >> + >> + "#access-controller-cells": >> + const: 1 >> + description: >> + Contains the debug profile necessary to access the peripheral. >> + >> +patternProperties: >> + "^.*@[0-9a-f]+$": >> + description: Debug related peripherals >> + type: object >> + >> + additionalProperties: true >> + >> + required: >> + - access-controllers >> + >> +required: >> + - "#access-controller-cells" >> + - "#address-cells" >> + - "#size-cells" >> + - compatible >> + - ranges >> + - reg >> + >> +additionalProperties: false >> + >> +examples: >> + - | >> + #include >> + >> + dbg_bus: bus@50080000 { >> + compatible = "st,stm32mp131-dbg-bus"; >> + reg = <0x50080000 0x3f80000>; > > That's a lot of registers... Yet the bus driver doesn't access any. > Looks to me like this belongs in ranges instead if there aren't any bus > registers. Or its size should be just the registers and then the whole > region size goes in ranges. > Hello Rob, Understandable comment. I'll switch to defining the range in the ranges property in the V3. Thank you, Gatien >> + #address-cells = <1>; >> + #size-cells = <1>; >> + #access-controller-cells = <1>; >> + ranges; >> + >> + cs_cti_trace: cti@50094000 { >> + compatible = "arm,coresight-cti", "arm,primecell"; >> + reg = <0x50094000 0x1000>; >> + clocks = <&rcc CK_DBG>; >> + clock-names = "apb_pclk"; >> + access-controllers = <&dbg_bus 0>; >> + }; >> + }; >> >> -- >> 2.43.0 >>