diff options
| author |   Ondrej Jirman <megous@megous.com> | 2019-04-13 18:54:13 +0200 |
|---|---|---|
| committer |   Linus Walleij <linus.walleij@linaro.org> | 2019-04-23 12:31:42 +0200 |
| commit | cc62383fcebe7f03c274462790fd912f4346304b (patch) | |
| tree | 4c240ae16567212ec6d50baac257bba55c0e5da7 /drivers/pinctrl/sunxi | |
| parent | pinctrl: sunxi: Prepare for alternative bias voltage setting methods (diff) | |
| download | linux-dev-cc62383fcebe7f03c274462790fd912f4346304b.tar.xz linux-dev-cc62383fcebe7f03c274462790fd912f4346304b.zip | |
pinctrl: sunxi: Support I/O bias voltage setting on H6
H6 SoC has a "pio group withstand voltage mode" register (datasheet
description), that needs to be used to select either 1.8V or 3.3V I/O mode,
based on what voltage is powering the respective pin banks and is thus used
for I/O signals.
Add support for configuring this register according to the voltage of the
pin bank regulator (if enabled).
This is similar to the support for I/O bias voltage setting patch for A80
and the same concerns apply. See:
commit 402bfb3c1352 ("Support I/O bias voltage setting on A80")
Signed-off-by: Ondrej Jirman <megous@megous.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/sunxi')
| -rw-r--r-- | drivers/pinctrl/sunxi/pinctrl-sun50i-h6.c | 1 | ||||
| -rw-r--r-- | drivers/pinctrl/sunxi/pinctrl-sunxi.c | 11 | ||||
| -rw-r--r-- | drivers/pinctrl/sunxi/pinctrl-sunxi.h | 7 |
3 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pinctrl/sunxi/pinctrl-sun50i-h6.c b/drivers/pinctrl/sunxi/pinctrl-sun50i-h6.c index ef4268cc6227..3cc1121589c9 100644 --- a/drivers/pinctrl/sunxi/pinctrl-sun50i-h6.c +++ b/drivers/pinctrl/sunxi/pinctrl-sun50i-h6.c @@ -591,6 +591,7 @@ static const struct sunxi_pinctrl_desc h6_pinctrl_data = { .irq_banks = 4, .irq_bank_map = h6_irq_bank_map, .irq_read_needs_mux = true, + .io_bias_cfg_variant = BIAS_VOLTAGE_PIO_POW_MODE_SEL, }; static int h6_pinctrl_probe(struct platform_device *pdev) diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c index 98c4de5f4019..0cbca30b75dc 100644 --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c @@ -614,6 +614,8 @@ static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl, unsigned pin, struct regulator *supply) { + unsigned short bank = pin / PINS_PER_BANK; + unsigned long flags; u32 val, reg; int uV; @@ -651,6 +653,15 @@ static int sunxi_pinctrl_set_io_bias_cfg(struct sunxi_pinctrl *pctl, reg &= ~IO_BIAS_MASK; writel(reg | val, pctl->membase + sunxi_grp_config_reg(pin)); return 0; + case BIAS_VOLTAGE_PIO_POW_MODE_SEL: + val = uV <= 1800000 ? 1 : 0; + + raw_spin_lock_irqsave(&pctl->lock, flags); + reg = readl(pctl->membase + PIO_POW_MOD_SEL_REG); + reg &= ~(1 << bank); + writel(reg | val << bank, pctl->membase + PIO_POW_MOD_SEL_REG); + raw_spin_unlock_irqrestore(&pctl->lock, flags); + return 0; default: return -EINVAL; } diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.h b/drivers/pinctrl/sunxi/pinctrl-sunxi.h index a62b81357136..44e30deeee38 100644 --- a/drivers/pinctrl/sunxi/pinctrl-sunxi.h +++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.h @@ -95,6 +95,8 @@ #define PINCTRL_SUN7I_A20 BIT(7) #define PINCTRL_SUN8I_R40 BIT(8) +#define PIO_POW_MOD_SEL_REG 0x340 + enum sunxi_desc_bias_voltage { BIAS_VOLTAGE_NONE, /* @@ -102,6 +104,11 @@ enum sunxi_desc_bias_voltage { * Pn_GRP_CONFIG registers, as seen on A80 SoC. */ BIAS_VOLTAGE_GRP_CONFIG, + /* + * Bias voltage is set through PIO_POW_MOD_SEL_REG + * register, as seen on H6 SoC, for example. + */ + BIAS_VOLTAGE_PIO_POW_MODE_SEL, }; struct sunxi_desc_function { |