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pinctrl: renesas: Add support for R-Car SoCs with pull-down only pins

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Currently, the common R-Car bias handling supports pin controllers with
either:
  1. Separate pin Pull-Enable (PUEN) and pin Pull-Up/Down control (PUD)
     registers, for controlling both pin pull-up and pin pull-down,
  2. A single pin Pull-Up control register (PUPR), for controlling pin
     pull-up.

Add support for a variant of #2, where some bits in the single pin
Pull-Up control register (PUPR) control pin pull-down instead of pin
pull-up.  This is the case for the "ASEBRK#/ACK" pin on R-Car M2-W,
M2-N, and E2, and the "ACK" pin on RZ/G1M, RZ/G1N, RZ/G1E, and RZ/G1C.
To describe such a register, SoC-specific drivers need to provide two
instances of pinmux_bias_reg: a first one with the puen field filled in,
listing pins with pull-up functionality, and a second one with the pud
field filled in, listing pins with pull-down functionality.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20210303132619.3938128-6-geert+renesas@glider.be
This commit is contained in:
Geert Uytterhoeven 2021-03-03 14:26:18 +01:00
parent 93d6c7d676
commit 1d3928a3e6
2 changed files with 34 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

49
drivers/pinctrl/renesas/pinctrl.c
View file

@ -847,7 +847,7 @@ rcar_pin_to_bias_reg(const struct sh_pfc *pfc, unsigned int pin,
{
unsigned int i, j;
for (i = 0; pfc->info->bias_regs[i].puen; i++) {
for (i = 0; pfc->info->bias_regs[i].puen || pfc->info->bias_regs[i].pud; i++) {
for (j = 0; j < ARRAY_SIZE(pfc->info->bias_regs[i].pins); j++) {
if (pfc->info->bias_regs[i].pins[j] == pin) {
*bit = j;
@ -870,12 +870,19 @@ unsigned int rcar_pinmux_get_bias(struct sh_pfc *pfc, unsigned int pin)
if (!reg)
return PIN_CONFIG_BIAS_DISABLE;
if (!(sh_pfc_read(pfc, reg->puen) & BIT(bit)))
return PIN_CONFIG_BIAS_DISABLE;
else if (!reg->pud || (sh_pfc_read(pfc, reg->pud) & BIT(bit)))
return PIN_CONFIG_BIAS_PULL_UP;
else
return PIN_CONFIG_BIAS_PULL_DOWN;
if (reg->puen) {
if (!(sh_pfc_read(pfc, reg->puen) & BIT(bit)))
return PIN_CONFIG_BIAS_DISABLE;
else if (!reg->pud || (sh_pfc_read(pfc, reg->pud) & BIT(bit)))
return PIN_CONFIG_BIAS_PULL_UP;
else
return PIN_CONFIG_BIAS_PULL_DOWN;
} else {
if (sh_pfc_read(pfc, reg->pud) & BIT(bit))
return PIN_CONFIG_BIAS_PULL_DOWN;
else
return PIN_CONFIG_BIAS_DISABLE;
}
}
void rcar_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
@ -889,19 +896,27 @@ void rcar_pinmux_set_bias(struct sh_pfc *pfc, unsigned int pin,
if (!reg)
return;
enable = sh_pfc_read(pfc, reg->puen) & ~BIT(bit);
if (bias != PIN_CONFIG_BIAS_DISABLE)
enable |= BIT(bit);
if (reg->puen) {
enable = sh_pfc_read(pfc, reg->puen) & ~BIT(bit);
if (bias != PIN_CONFIG_BIAS_DISABLE)
enable |= BIT(bit);
if (reg->pud) {
updown = sh_pfc_read(pfc, reg->pud) & ~BIT(bit);
if (bias == PIN_CONFIG_BIAS_PULL_UP)
updown |= BIT(bit);
if (reg->pud) {
updown = sh_pfc_read(pfc, reg->pud) & ~BIT(bit);
if (bias == PIN_CONFIG_BIAS_PULL_UP)
updown |= BIT(bit);
sh_pfc_write(pfc, reg->pud, updown);
sh_pfc_write(pfc, reg->pud, updown);
}
sh_pfc_write(pfc, reg->puen, enable);
} else {
enable = sh_pfc_read(pfc, reg->pud) & ~BIT(bit);
if (bias == PIN_CONFIG_BIAS_PULL_DOWN)
enable |= BIT(bit);
sh_pfc_write(pfc, reg->pud, enable);
}
sh_pfc_write(pfc, reg->puen, enable);
}
#define PORTnCR_PULMD_OFF (0 << 6)

4
drivers/pinctrl/renesas/sh_pfc.h
View file

@ -188,9 +188,9 @@ struct pinmux_drive_reg {
.reg = r, \
.fields =
struct pinmux_bias_reg {
struct pinmux_bias_reg { /* At least one of puen/pud must exist */
u32 puen; /* Pull-enable or pull-up control register */
u32 pud; /* Pull-up/down control register (optional) */
u32 pud; /* Pull-up/down or pull-down control register */
const u16 pins[32];
};