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pinctrl: sh-pfc: Validate enum IDs for regs with variable-width fields 

Add a run-time check to the PINMUX_CFG_REG_VAR() macro, to ensure the
number of provided enum IDs is correct.  This cannot be done at build
time, as the number of values depends on the variable-width fields in
the config register.

This helps catching bugs early.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
This commit is contained in:
Geert Uytterhoeven 2018-12-13 15:48:45 +01:00
parent c481c81784
commit fa4d36712f
2 changed files with 13 additions and 0 deletions
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6
drivers/pinctrl/sh-pfc/core.c
View File

@ -756,6 +756,12 @@ static void sh_pfc_check_cfg_reg(const char *drvname,
drvname, cfg_reg->reg, rw, cfg_reg->reg_width);
sh_pfc_errors++;
}
if (n != cfg_reg->nr_enum_ids) {
pr_err("%s: reg 0x%x: enum_ids[] has %u instead of %u values\n",
drvname, cfg_reg->reg, cfg_reg->nr_enum_ids, n);
sh_pfc_errors++;
}
}
static void sh_pfc_check_info(const struct sh_pfc_soc_info *info)

7
drivers/pinctrl/sh-pfc/sh_pfc.h
View File

@ -111,6 +111,12 @@ struct pinmux_func {
struct pinmux_cfg_reg {
u32 reg;
u8 reg_width, field_width;
#ifdef DEBUG
u16 nr_enum_ids; /* for variable width regs only */
#define SET_NR_ENUM_IDS(n) .nr_enum_ids = n,
#else
#define SET_NR_ENUM_IDS(n)
#endif
const u16 *enum_ids;
const u8 *var_field_width;
};
@ -151,6 +157,7 @@ struct pinmux_cfg_reg {
#define PINMUX_CFG_REG_VAR(name, r, r_width, f_widths, ids) \
.reg = r, .reg_width = r_width, \
.var_field_width = (const u8 []) { f_widths, 0 }, \
SET_NR_ENUM_IDS(sizeof((const u16 []) { ids }) / sizeof(u16)) \
.enum_ids = (const u16 []) { ids }
struct pinmux_drive_reg_field {