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authorOndrej Jirman <megous@megous.com>2019-04-13 18:54:13 +0200
committerLinus Walleij <linus.walleij@linaro.org>2019-04-23 12:31:42 +0200
commitcc62383fcebe7f03c274462790fd912f4346304b (patch)
tree4c240ae16567212ec6d50baac257bba55c0e5da7 /drivers/pinctrl/sunxi
parentf7275345728a0ff18a0607dd3706f2ca25dc53e0 (diff)
downloadlinux-cc62383fcebe7f03c274462790fd912f4346304b.tar.bz2
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.c1
-rw-r--r--drivers/pinctrl/sunxi/pinctrl-sunxi.c11
-rw-r--r--drivers/pinctrl/sunxi/pinctrl-sunxi.h7
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 {