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pinctrl: sh-pfc: Validate fixed-size field widths at build time

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Add a build-time check, to ensure the register and field widths in
descriptors for config registers with fixed-width fields are sane.
This helps catching bugs early.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2019-01-25 11:56:05 +01:00
parent 0e6e448bdc
commit 5e8588c86d
1 changed files with 2 additions and 1 deletions
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3
drivers/pinctrl/sh-pfc/sh_pfc.h
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@ -126,7 +126,8 @@ struct pinmux_cfg_reg {
* one for each possible combination of the register field bit values.
*/
#define PINMUX_CFG_REG(name, r, r_width, f_width) \
.reg = r, .reg_width = r_width, .field_width = f_width, \
.reg = r, .reg_width = r_width, \
.field_width = f_width + BUILD_BUG_ON_ZERO(r_width % f_width), \
.enum_ids = (const u16 [(r_width / f_width) * (1 << f_width)])
/*