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pcmcia: soc_common: add support for Vcc and Vpp regulators

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Add support for handling supply regulators in the soc_common code.  This
allows us to separate out the board specifics for setting voltages from
the PCMCIA code.

We detect when setting a voltage fails, and report this fact - some
platforms have fixed-voltage supplies (eg, for CF sockets at 3.3V) and
we need to ignore attempts to configure for 5V, as per the existing
board specific drivers.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Russell King 2016-08-31 08:49:46 +01:00
parent a1d0500261
commit ac61b6001a
2 changed files with 47 additions and 1 deletions
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37
drivers/pcmcia/soc_common.c
View File

@ -43,6 +43,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/regulator/consumer.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
@ -80,6 +81,41 @@ EXPORT_SYMBOL(soc_pcmcia_debug);
#define to_soc_pcmcia_socket(x) \
container_of(x, struct soc_pcmcia_socket, socket)
int soc_pcmcia_regulator_set(struct soc_pcmcia_socket *skt,
struct soc_pcmcia_regulator *r, int v)
{
bool on;
int ret;
if (!r->reg)
return 0;
on = v != 0;
if (r->on == on)
return 0;
if (on) {
ret = regulator_set_voltage(r->reg, v * 100000, v * 100000);
if (ret) {
int vout = regulator_get_voltage(r->reg) / 100000;
dev_warn(&skt->socket.dev,
"CS requested %s=%u.%uV, applying %u.%uV\n",
r == &skt->vcc ? "Vcc" : "Vpp",
v / 10, v % 10, vout / 10, vout % 10);
}
ret = regulator_enable(r->reg);
} else {
regulator_disable(r->reg);
}
if (ret == 0)
r->on = on;
return ret;
}
EXPORT_SYMBOL_GPL(soc_pcmcia_regulator_set);
static unsigned short
calc_speed(unsigned short *spds, int num, unsigned short dflt)
{
@ -119,7 +155,6 @@ static void __soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt,
if (skt->ops->hw_shutdown)
skt->ops->hw_shutdown(skt);
clk_disable_unprepare(skt->clk);
}

11
drivers/pcmcia/soc_common.h
View File

@ -19,6 +19,12 @@
struct device;
struct gpio_desc;
struct pcmcia_low_level;
struct regulator;
struct soc_pcmcia_regulator {
struct regulator *reg;
bool on;
};
/*
* This structure encapsulates per-socket state which we might need to
@ -64,6 +70,8 @@ struct soc_pcmcia_socket {
struct gpio_desc *gpio_reset;
struct gpio_desc *gpio_bus_enable;
struct soc_pcmcia_regulator vcc;
struct soc_pcmcia_regulator vpp;
unsigned int irq_state;
@ -146,6 +154,9 @@ int soc_pcmcia_request_gpiods(struct soc_pcmcia_socket *skt);
void soc_common_cf_socket_state(struct soc_pcmcia_socket *skt,
struct pcmcia_state *state);
int soc_pcmcia_regulator_set(struct soc_pcmcia_socket *skt,
struct soc_pcmcia_regulator *r, int v);
#ifdef CONFIG_PCMCIA_DEBUG
extern void soc_pcmcia_debug(struct soc_pcmcia_socket *skt, const char *func,