Hello all, Here's an implementation of ACPI 6.4 _CRS CSI-2 resource descriptor and MIPI DisCo for Imaging 1.0 [1]. What the two basically provide is an officially sanctioned way to describe CSI-2 connected cameras to operating system software, something DT based systems have enjoyed for quite some time already. The implementation digs the information from ACPI tables (_CRS descriptors and data + property extensions) and constructs software nodes that are compatible with Documentation/firmware-guide/acpi/dsd/graph.rst and Documentation/devicetree/bindings/media/video-interface-devices.yaml . No specific driver changes are needed. The first patch of the set also removes the second namespace walk from DSDT root. [1] https://www.mipi.org/specifications/mipi-disco-imaging since v6: - Avoid including an extra patch in the set. Otherwise the set is unchanged. since v5: - Add a high level description of the mipi.c file in the heading. - Add a missing memory allocation check (thanks to Dan Carpenter). - Prepend a patch to the set that removes the second ACPI namespace walk due _DEP. Instead, the devices that can't be initialised yet are collected to a linked list that is revisited after initialising the rest of the devices. - Collect information on _CRS CSI2 records during the same, single namespace walk. Effectively since v5, two namespace walks from the namespace root are removed. - The former requires passing state information between functions during the _DSD property initialisation, among other things, introducing additional function arguments in _DSD parsing functions. - The order of the patches has changed somewhat, as the parsing process has changed. Also a patch has been added to collect ACPI devices for which software nodes need to be initialised for DisCo for Imaging. - Elsewhere, acpi_bus_scan() becomes easier to grasp. Comments are also added in acpi_bus_scan() to explain what is being done. - Change the wrong node type warning from acpi_parse_string_ref() to use debug level. since v4: - Add leading dots to comment sentences. - Use UINT_MAX - 1 to denote an unallocated port instead of ~1U. - Unwrap a line. - Get ACPI handle into a local variable in acpi_init_swnodes() for easier use, use acpi_device_handle() to obtain it. - Rework "rotation" property checking and _PLD object access. - Also obtain return value of acpi_get_name() into a local variable before testing it. - Use a local variable for the first element string pointer in acpi_properties_prepare_mipi(). since v3: - Add comments to data structures and functions, code inside functions. - Use ACPI_FAILURE() for testing ACPI framework function return values. - Unwrap a few lines. - Rename list heads as "head", some were called just "list". - Count ACPI handles related to _CRS CSI2 resources during tree walk. - Reshape testing for CSI-2 port allocation in next_csi2_port_index(). - Move allocation of software nodes into a new function, acpi_crs_csi2_alloc_fill_swnodes(). - Comments: acpi_bus_scan_crs_csi2() is to be called on the namespace root. - Use size_t for this_count variable in acpi_bus_scan_crs_csi2(). - Revert the NEXT_PROPERTY() macro condition to original (the suggested one was different). - Remove u union in init_port_csi2_common(). - Fix val array size in init_port_csi2_common(). This issue was masked by the presence of a u32 field in the union. - Use "-" for copyright year range. since v2: - Unwrap a few lines. - Copy CSI-2 resource source string using strscpy() instead of memcpy() in scan_check_crs_csi2_instance. - Fix GRAPH_PORT_NAME() sanity check bug introduced in v2. - Fix snprintf() return value check for port node name in get_mipi_port_handle(). - Fix mipi-img-lane-polarities reading. - Cast bit value to bool instead of using ... ? 1U : 0U. - Get primary fwnode using acpi_fwnode_handle(). - Don't use MIPI_IMG_PREFIX in the array of renamed properties. - Use tabs for indenting drivers/acpi/property.c authors. - Add a comment on assigning ACPI device's secondary fwnode and assign ACPI device's secondary fwnode straight to NULL when unassigning it. since v1: - Update copyright notices. - Include linux/types.h instead of linux/kernel.h in drivers/acpi/mipi.c. - Use SWNODE_GRAPH_PORT_NAME_FMT instead of plain "port@%u" in GRAPH_PORT_NAME macro. - Make the condition in NEXT_PROPERTY() macro easier to read. - Unwrap lines to make them moderately longer than 80 characters. - Use * BITS_PER_TYPE(u8) instead of << 3 to convert bytes to bits in init_port_csi2_common(). - Test ACPI framework call success using ACPI_SUCCESS() instead of comparing with AE_OK. Likewise for ACPI_FAILURE and != AE_OK. - Use newly added SOFTWARE_NODE() macro to construct the root software node. - Use str_has_prefix() to test for a string prefix instead of memcmp(). - Add pr_fmt() macro to drivers/acpi/property.c. - Move logical or operators to the end of the line in acpi_properties_prepare(). - Improve bad node type error in acpi_parse_string_ref(). Sakari Ailus (10): ACPI: scan: Remove the second DSDT traversal ACPI: property: Parse data node string references in properties ACPI: property: Parse _CRS CSI-2 descriptor device property: Add SOFTWARE_NODE() macro for defining software nodes ACPI: property: Prepare generating swnodes for ACPI and DisCo for Imaging ACPI: scan: Generate software nodes based on MIPI DisCo for Imaging ACPI: property: Dig "rotation" property for devices with CSI2 _CRS ACPI: property: Rename parsed MIPI DisCo for Imaging properties ACPI: property: Skip MIPI property table without "mipi-img" prefix ACPI: property: Document _CRS CSI-2 and DisCo for Imaging support drivers/acpi/Makefile | 2 +- drivers/acpi/internal.h | 41 +- drivers/acpi/mipi.c | 796 +++++++++++++++++++++++++++++++++++++++ drivers/acpi/power.c | 2 +- drivers/acpi/property.c | 180 +++++++-- drivers/acpi/scan.c | 227 +++++++++-- include/acpi/acpi_bus.h | 82 ++++ include/linux/property.h | 7 + 8 files changed, 1252 insertions(+), 85 deletions(-) create mode 100644 drivers/acpi/mipi.c -- 2.30.2
