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authorRussell King <rmk+kernel@armlinux.org.uk>2016-08-31 08:49:46 +0100
committerRussell King <rmk+kernel@armlinux.org.uk>2016-09-22 09:39:02 +0100
commitac61b6001a636ab9aa954b5f9a996056cd8519f4 (patch)
treed2c5e8c5344232f0dc781c68b23f0cdbb3375408 /drivers/pcmcia/soc_common.c
parenta1d0500261e788f9b1d068e3167b2a77ad0abfc4 (diff)
pcmcia: soc_common: add support for Vcc and Vpp regulators
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>
Diffstat (limited to 'drivers/pcmcia/soc_common.c')
-rw-r--r--drivers/pcmcia/soc_common.c37
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index 6d0ec291f475..15e332aca0f3 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -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);
}