lkml.org 
[lkml]   [2019]   [Apr]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 04/11] pinctrl: sunxi: Support I/O bias voltage setting on H6
Date
From: Ondrej Jirman <megous@megous.com>

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>
---
drivers/pinctrl/sunxi/pinctrl-sun50i-h6.c | 1 +
drivers/pinctrl/sunxi/pinctrl-sunxi.c | 11 +++++++++++
drivers/pinctrl/sunxi/pinctrl-sunxi.h | 5 +++++
3 files changed, 17 insertions(+)

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 4bfc8a6d9dce..36186906f0a7 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.h
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.h
@@ -95,11 +95,16 @@
#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,
/* Bias voltage configuration is done through
* 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 {
--
2.21.0
\
 
 \ /
  Last update: 2019-04-11 12:21    [W:0.115 / U:32.952 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site