pcmcia: soc_common: add support for reset and bus enable GPIOs

Add support to soc_common for controlling reset and bus enable GPIOs
from within the generic soc_common layer, rather than having
individual drivers having to perform this themselves.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

drivers/pcmcia/soc_common.c

@@ -119,6 +119,7 @@ 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);
 }
 
@@ -286,6 +287,21 @@ static int soc_common_pcmcia_config_skt(
 
 	ret = skt->ops->configure_socket(skt, state);
 	if (ret == 0) {
+		struct gpio_desc *descs[2];
+		int values[2], n = 0;
+
+		if (skt->gpio_reset) {
+			descs[n] = skt->gpio_reset;
+			values[n++] = !!(state->flags & SS_RESET);
+		}
+		if (skt->gpio_bus_enable) {
+			descs[n] = skt->gpio_bus_enable;
+			values[n++] = !!(state->flags & SS_OUTPUT_ENA);
+		}
+
+		if (n)
+			gpiod_set_array_value_cansleep(n, descs, values);
+
 		/*
 		 * This really needs a better solution.  The IRQ
 		 * may or may not be claimed by the driver.

drivers/pcmcia/soc_common.h

@@ -62,6 +62,9 @@ struct soc_pcmcia_socket {
 #define SOC_STAT_BVD2		2	/* BATWARN / IOSPKR */
 #define SOC_STAT_RDY		3	/* Ready / Interrupt */
 
+	struct gpio_desc	*gpio_reset;
+	struct gpio_desc	*gpio_bus_enable;
+
 	unsigned int		irq_state;
 
 	struct timer_list	poll_timer;