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pinctrl: renesas: checker: Add pin group sharing checks

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Add checks for discovering pin groups that could share pin data, as
sharing reduces kernel size.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/e16fdf729156e13b591d2f082f2cc934da580074.1640270559.git.geert+renesas@glider.be
This commit is contained in:
Geert Uytterhoeven 2021-12-23 15:56:21 +01:00
parent 27b32fbb28
commit 4bb9514c49
1 changed files with 32 additions and 5 deletions
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37
drivers/pinctrl/renesas/core.c
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@ -924,6 +924,35 @@ static void __init sh_pfc_check_bias_reg(const struct sh_pfc_soc_info *info,
sh_pfc_check_pin(info, bias->puen, bias->pins[i]);
}
static void __init sh_pfc_compare_groups(const char *drvname,
const struct sh_pfc_pin_group *a,
const struct sh_pfc_pin_group *b)
{
unsigned int i;
size_t len;
if (same_name(a->name, b->name))
sh_pfc_err("group %s: name conflict\n", a->name);
if (a->nr_pins > b->nr_pins)
swap(a, b);
len = a->nr_pins * sizeof(a->pins[0]);
for (i = 0; i <= b->nr_pins - a->nr_pins; i++) {
if (a->pins == b->pins + i || a->mux == b->mux + i ||
memcmp(a->pins, b->pins + i, len) ||
memcmp(a->mux, b->mux + i, len))
continue;
if (a->nr_pins == b->nr_pins)
sh_pfc_warn("group %s can be an alias for %s\n",
a->name, b->name);
else
sh_pfc_warn("group %s is a subset of %s\n", a->name,
b->name);
}
}
static void __init sh_pfc_check_info(const struct sh_pfc_soc_info *info)
{
const struct pinmux_bias_reg *bias_regs = info->bias_regs;
@ -1000,11 +1029,9 @@ static void __init sh_pfc_check_info(const struct sh_pfc_soc_info *info)
sh_pfc_err("empty group %u\n", i);
continue;
}
for (j = 0; j < i; j++) {
if (same_name(group->name, info->groups[j].name))
sh_pfc_err("group %s: name conflict\n",
group->name);
}
for (j = 0; j < i; j++)
sh_pfc_compare_groups(drvname, group, &info->groups[j]);
if (!refcnts[i])
sh_pfc_err("orphan group %s\n", group->name);
else if (refcnts[i] > 1)