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06f054b1fe
Pull devicetree updates from Rob Herring:
"DT Bindings:
- Convert samsung,exynos5-dp, atmel,lcdc, aspeed,ast2400-wdt bindings
to schemas
- Add bindings for Allwinner H616 NMI controller, Renesas r8a779g0
irqc, Renesas R-Car V4M TMU and CMT timers, Freescale S32G3
linflexuart, and Mediatek MT7988 XHCI
- Add 'reg' constraints on DSI and SPI display panels
- More dropping of unnecessary quotes in schemas
- Use full paths rather than relative paths in schema $refs
- Drop redundant storing of phandle for reserved memory
DT Core:
- Use scope based cleanups for kfree() and of_node_put()
- Track interrupt-map and power-supplies for fw_devlink
- Add buffer overflow check in of_modalias()
- Add and use __of_prop_free() helper for freeing struct property"
* tag 'devicetree-for-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (25 commits)
of: property: Add fw_devlink support for interrupt-map property
dt-bindings: display: panel: constrain 'reg' in DSI panels
dt-bindings: display: panel: constrain 'reg' in SPI panels
dt-bindings: display: samsung,ams495qa01: add missing SPI properties ref
dt-bindings: Use full path to other schemas
dt-bindings: PCI: qcom,pcie-sm8350: Drop redundant 'oneOf' sub-schema
of: module: add buffer overflow check in of_modalias()
dt-bindings: PCI: microchip: increase number of items in ranges property
dt-bindings: Drop unnecessary quotes on keys
dt-bindings: interrupt-controller: mediatek,mt6577-sysirq: Drop unnecessary quotes
of: property: Use scope based cleanup on port_node
of: reserved_mem: Remove the use of phandle from the reserved_mem APIs
of: property: fw_devlink: Add support for "power-supplies" binding
dt-bindings: watchdog: aspeed,ast2400-wdt: Convert to DT schema
dt-bindings: irq: sun7i-nmi: Add binding for the H616 NMI controller
dt-bindings: interrupt-controller: renesas,irqc: Add r8a779g0 support
dt-bindings: timer: renesas,tmu: Add R-Car V4M support
dt-bindings: timer: renesas,cmt: Add R-Car V4M support
of: Use scope based of_node_put() cleanups
of: Use scope based kfree() cleanups
...
84 lines
1.6 KiB
C
84 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Linux kernel module helpers.
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*/
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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ssize_t of_modalias(const struct device_node *np, char *str, ssize_t len)
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{
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const char *compat;
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char *c;
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struct property *p;
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ssize_t csize;
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ssize_t tsize;
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/*
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* Prevent a kernel oops in vsnprintf() -- it only allows passing a
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* NULL ptr when the length is also 0. Also filter out the negative
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* lengths...
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*/
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if ((len > 0 && !str) || len < 0)
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return -EINVAL;
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/* Name & Type */
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/* %p eats all alphanum characters, so %c must be used here */
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csize = snprintf(str, len, "of:N%pOFn%c%s", np, 'T',
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of_node_get_device_type(np));
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tsize = csize;
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if (csize >= len)
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csize = len > 0 ? len - 1 : 0;
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len -= csize;
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str += csize;
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of_property_for_each_string(np, "compatible", p, compat) {
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csize = strlen(compat) + 1;
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tsize += csize;
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if (csize >= len)
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continue;
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csize = snprintf(str, len, "C%s", compat);
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for (c = str; c; ) {
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c = strchr(c, ' ');
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if (c)
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*c++ = '_';
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}
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len -= csize;
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str += csize;
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}
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return tsize;
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}
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int of_request_module(const struct device_node *np)
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{
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char *str;
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ssize_t size;
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int ret;
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if (!np)
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return -ENODEV;
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size = of_modalias(np, NULL, 0);
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if (size < 0)
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return size;
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/* Reserve an additional byte for the trailing '\0' */
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size++;
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str = kmalloc(size, GFP_KERNEL);
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if (!str)
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return -ENOMEM;
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of_modalias(np, str, size);
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str[size - 1] = '\0';
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ret = request_module(str);
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kfree(str);
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return ret;
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}
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EXPORT_SYMBOL_GPL(of_request_module);
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