debugfs: regset32: Add Runtime PM support

Hardware registers of devices under control of power management cannot be accessed at all times. If such a device is suspended, register accesses may lead to undefined behavior, like reading bogus values, or causing exceptions or system lock-ups. Extend struct debugfs_regset32 with an optional field to let device drivers specify the device the registers in the set belong to. This allows debugfs_show_regset32() to make sure the device is resumed while its registers are being read.

Geert Uytterhoeven committed 6 years ago

Commit 30332ee1 parent 9e00df72 files · +9 −0Browse files

Showing the changes to include/linux (1 of 2 files). Show all

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include/linux/debugfs.h+1−0

@@ -35,6 +35,7 @@ struct debugfs_regset32 { · 34 unmodified lines
35	const struct debugfs_reg32 *regs;	35	const struct debugfs_reg32 *regs;
36	int nregs;	36	int nregs;
37	void __iomem *base;	37	void __iomem *base;
		38	struct device dev; / Optional device for Runtime PM */
38	};	39	};
39		40
40	extern struct dentry *arch_debugfs_dir;	41	extern struct dentry *arch_debugfs_dir;