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Received: from IA4PR12MB9788.namprd12.prod.outlook.com (2603:10b6:208:5d5::11) by CH8PR12MB9838.namprd12.prod.outlook.com (2603:10b6:610:270::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.48.20; Mon, 25 May 2026 14:09:45 +0000 Received: from IA4PR12MB9788.namprd12.prod.outlook.com ([fe80::aac5:ae06:3bf1:36db]) by IA4PR12MB9788.namprd12.prod.outlook.com ([fe80::aac5:ae06:3bf1:36db%6]) with mapi id 15.21.0048.019; Mon, 25 May 2026 14:09:45 +0000 Message-ID: <13ee424b-60f2-4180-8964-b467794a4772@amd.com> Date: Mon, 25 May 2026 16:09:40 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/2] Add dynamic CSU register sysfs interface To: Ronak Jain , senthilnathan.thangaraj@amd.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20260520093654.3303917-1-ronak.jain@amd.com> Content-Language: en-US From: Michal Simek Autocrypt: addr=michal.simek@amd.com; keydata= xsFNBFFuvDEBEAC9Amu3nk79+J+4xBOuM5XmDmljuukOc6mKB5bBYOa4SrWJZTjeGRf52VMc howHe8Y9nSbG92obZMqsdt+d/hmRu3fgwRYiiU97YJjUkCN5paHXyBb+3IdrLNGt8I7C9RMy svSoH4WcApYNqvB3rcMtJIna+HUhx8xOk+XCfyKJDnrSuKgx0Svj446qgM5fe7RyFOlGX/wF Ae63Hs0RkFo3I/+hLLJP6kwPnOEo3lkvzm3FMMy0D9VxT9e6Y3afe1UTQuhkg8PbABxhowzj SEnl0ICoqpBqqROV/w1fOlPrm4WSNlZJunYV4gTEustZf8j9FWncn3QzRhnQOSuzTPFbsbH5 WVxwDvgHLRTmBuMw1sqvCc7CofjsD1XM9bP3HOBwCxKaTyOxbPJh3D4AdD1u+cF/lj9Fj255 Es9aATHPvoDQmOzyyRNTQzupN8UtZ+/tB4mhgxWzorpbdItaSXWgdDPDtssJIC+d5+hskys8 B3jbv86lyM+4jh2URpnL1gqOPwnaf1zm/7sqoN3r64cml94q68jfY4lNTwjA/SnaS1DE9XXa XQlkhHgjSLyRjjsMsz+2A4otRLrBbumEUtSMlPfhTi8xUsj9ZfPIUz3fji8vmxZG/Da6jx/c a0UQdFFCL4Ay/EMSoGbQouzhC69OQLWNH3rMQbBvrRbiMJbEZwARAQABzSlNaWNoYWwgU2lt ZWsgKEFNRCkgPG1pY2hhbC5zaW1la0BhbWQuY29tPsLBlAQTAQgAPgIbAwULCQgHAgYVCgkI CwIEFgIDAQIeAQIXgBYhBGc1DJv1zO6bU2Q1ajd8fyH+PR+RBQJn8lwDBQkaRgbLAAoJEDd8 fyH+PR+RCNAP/iHkKbpP0XXfgfWqf8yyrFHjGPJSknERzxw0glxPztfC3UqeusQ0CPnbI85n uQdm5/zRgWr7wi8H2UMqFlfMW8/NH5Da7GOPc26NMTPA2ZG5S2SG2SGZj1Smq8mL4iueePiN x1qfWhVm7TfkDHUEmMAYq70sjFcvygyqHUCumpw36CMQSMyrxyEkbYm1NKORlnySAFHy2pOx nmXKSaL1yfof3JJLwNwtaBj76GKQILnlYx9QNnt6adCtrZLIhB3HGh4IRJyuiiM0aZi1G8ei 2ILx2n2LxUw7X6aAD0sYHtNKUCQMCBGQHzJLDYjEyy0kfYoLXV2P6K+7WYnRP+uV8g77Gl9a IuGvxgEUITjMakX3e8RjyZ5jmc5ZAsegfJ669oZJOzQouw/W9Qneb820rhA2CKK8BnmlkHP+ WB5yDks3gSHE/GlOWqRkVZ05sUjVmq/tZ1JEdOapWQovRQsueDjxXcMjgNo5e8ttCyMo44u1 pKXRJpR5l7/hBYWeMlcKvLwByep+FOGtKsv0xadMKr1M6wPZXkV83jMKxxRE9HlqWJLLUE1Q 0pDvn1EvlpDj9eED73iMBsrHu9cIk8aweTEbQ4bcKRGfGkXrCwle6xRiKSjXCdzWpOglNhjq 1g8Ak+G+ZR6r7QarL01BkdE2/WUOLHdGHB1hJxARbP2E3l46zsFNBFFuvDEBEACXqiX5h4IA 03fJOwh+82aQWeHVAEDpjDzK5hSSJZDE55KP8br1FZrgrjvQ9Ma7thSu1mbr+ydeIqoO1/iM fZA+DDPpvo6kscjep11bNhVa0JpHhwnMfHNTSHDMq9OXL9ZZpku/+OXtapISzIH336p4ZUUB 5asad8Ux70g4gmI92eLWBzFFdlyR4g1Vis511Nn481lsDO9LZhKyWelbif7FKKv4p3FRPSbB vEgh71V3NDCPlJJoiHiYaS8IN3uasV/S1+cxVbwz2WcUEZCpeHcY2qsQAEqp4GM7PF2G6gtz IOBUMk7fjku1mzlx4zP7uj87LGJTOAxQUJ1HHlx3Li+xu2oF9Vv101/fsCmptAAUMo7KiJgP Lu8TsP1migoOoSbGUMR0jQpUcKF2L2jaNVS6updvNjbRmFojK2y6A/Bc6WAKhtdv8/e0/Zby iVA7/EN5phZ1GugMJxOLHJ1eqw7DQ5CHcSQ5bOx0Yjmhg4PT6pbW3mB1w+ClAnxhAbyMsfBn XxvvcjWIPnBVlB2Z0YH/gizMDdM0Sa/HIz+q7JR7XkGL4MYeAM15m6O7hkCJcoFV7LMzkNKk OiCZ3E0JYDsMXvmh3S4EVWAG+buA+9beElCmXDcXPI4PinMPqpwmLNcEhPVMQfvAYRqQp2fg 1vTEyK58Ms+0a9L1k5MvvbFg9QARAQABwsF8BBgBCAAmAhsMFiEEZzUMm/XM7ptTZDVqN3x/ If49H5EFAmfyXCkFCRpGBvgACgkQN3x/If49H5GY5xAAoKWHRO/OlI7eMA8VaUgFInmphBAj fAgQbW6Zxl9ULaCcNSoJc2D0zYWXftDOJeXyVk5Gb8cMbLA1tIMSM/BgSAnT7As2KfcZDTXQ DJSZYWgYKc/YywLgUlpv4slFv5tjmoUvHK9w2DuFLW254pnUuhrdyTEaknEM+qOmPscWOs0R dR6mMTN0vBjnLUeYdy0xbaoefjT+tWBybXkVwLDd3d/+mOa9ZiAB7ynuVWu2ow/uGJx0hnRI LGfLsiPu47YQrQXu79r7RtVeAYwRh3ul7wx5LABWI6n31oEHxDH+1czVjKsiozRstEaUxuDZ jWRHq+AEIq79BTTopj2dnW+sZAsnVpQmc+nod6xR907pzt/HZL0WoWwRVkbg7hqtzKOBoju3 hftqVr0nx77oBZD6mSJsxM/QuJoaXaTX/a/QiB4Nwrja2jlM0lMUA/bGeM1tQwS7rJLaT3cT RBGSlJgyWtR8IQvX3rqHd6QrFi1poQ1/wpLummWO0adWes2U6I3GtD9vxO/cazWrWBDoQ8Da otYa9+7v0j0WOBTJaj16LFxdSRq/jZ1y/EIHs3Ysd85mUWXOB8xZ6h+WEMzqAvOt02oWJVbr ZLqxG/3ScDXZEUJ6EDJVoLAK50zMk87ece2+4GWGOKfFsiDfh7fnEMXQcykxuowBYUD0tMd2 mpwx1d8= In-Reply-To: <20260520093654.3303917-1-ronak.jain@amd.com> Content-Type: text/plain; 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The implementation uses dynamic discovery via the > PM_QUERY_DATA firmware API to determine available registers at > runtime, making the interface flexible and maintainable without > requiring kernel changes when firmware capabilities evolve. > > Background: > > The ZynqMP platform has several CSU registers that are useful for > system configuration and debugging. Previously, accessing these > registers required direct memory access or custom tools. This series > provides a standardized sysfs interface that leverages existing > firmware APIs for secure access. > > Key Features: > > - Dynamic register discovery using PM_QUERY_DATA API > * PM_QID_GET_NODE_COUNT: Query number of available registers > * PM_QID_GET_NODE_NAME: Query register names by index > - Automatic sysfs attribute creation under csu_registers/ group > - Read operations via existing IOCTL_READ_REG firmware API > - Write operations via existing IOCTL_MASK_WRITE_REG firmware API > - Firmware-enforced access control for read-only registers > > Currently Supported Registers: > > - multiboot (CSU_MULTI_BOOT): Boot mode configuration > - idcode (CSU_IDCODE): Device identification (read-only) > - pcap-status (CSU_PCAP_STATUS): PCAP status (read-only) > > The sysfs interface is available at: > /sys/devices/platform/firmware:zynqmp-firmware/csu_registers/ > > Usage Examples: > > Reading a register: > # cat /sys/devices/platform/firmware:zynqmp-firmware/csu_registers/idcode > > Writing a register (mask and value in hex): > # echo "0xFFFFFFFF 0x0" > /sys/devices/platform/firmware:zynqmp-firmware/csu_registers/multiboot > > > Testing: > > - Verified register read operations return correct values > - Verified write operations update registers correctly > - Verified read-only registers reject write attempts > - Verified dynamic discovery works with different firmware versions > > Changes in v2: > Patch #1 > - Update date > > Patch #2: > - Removed unused csu_reg_count field from struct zynqmp_csu_data and > its kernel-doc entry. > - Added explicit devm_kfree() on the csu_regs and attrs allocation > failure paths, plus on devm_device_add_group() failure — keeps the > footprint minimal when CSU is optional. > - Expanded the 0644 sysfs-mode inline comment into a block comment > explaining the firmware-enforced access-control limitation.Also, > update the commit message accordingly. > - Added zynqmp_pm_is_function_supported check for PM_QID_GET_NODE_NAME > ID to mirror the PM_QID_GET_NODE_COUNT verification. > > Ronak Jain (2): > Documentation: ABI: add sysfs interface for ZynqMP CSU registers > firmware: zynqmp: Add dynamic CSU register discovery and sysfs > interface > > .../ABI/stable/sysfs-driver-firmware-zynqmp | 33 +++ > MAINTAINERS | 10 + > drivers/firmware/xilinx/Makefile | 2 +- > drivers/firmware/xilinx/zynqmp-csu-reg.c | 258 ++++++++++++++++++ > drivers/firmware/xilinx/zynqmp-csu-reg.h | 18 ++ > drivers/firmware/xilinx/zynqmp.c | 6 + > include/linux/firmware/xlnx-zynqmp.h | 4 +- > 7 files changed, 329 insertions(+), 2 deletions(-) > create mode 100644 drivers/firmware/xilinx/zynqmp-csu-reg.c > create mode 100644 drivers/firmware/xilinx/zynqmp-csu-reg.h > Applied with kernel version changed to 7.2. Thanks, Michal