Merge tag 'tty-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial driver updates from Greg KH:
 "Here is the big tty and serial driver update for 4.8-rc1.

  Lots of good cleanups from Jiri on a number of vt and other tty
  related things, and the normal driver updates.  Full details are in
  the shortlog.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (90 commits)
  tty/serial: atmel: enforce tasklet init and termination sequences
  serial: sh-sci: Stop transfers in sci_shutdown()
  serial: 8250_ingenic: drop #if conditional surrounding earlycon code
  serial: 8250_mtk: drop !defined(MODULE) conditional
  serial: 8250_uniphier: drop !defined(MODULE) conditional
  earlycon: mark earlycon code as __used iif the caller is built-in
  tty/serial/8250: use mctrl_gpio helpers
  serial: mctrl_gpio: enable API usage only for initialized mctrl_gpios struct
  serial: mctrl_gpio: add modem control read routine
  tty/serial/8250: make UART_MCR register access consistent
  serial: 8250_mid: Read RX buffer on RX DMA timeout for DNV
  serial: 8250_dma: Export serial8250_rx_dma_flush()
  dmaengine: hsu: Export hsu_dma_get_status()
  tty: serial: 8250: add CON_CONSDEV to flags
  tty: serial: samsung: add byte-order aware bit functions
  tty: serial: samsung: fixup accessors for endian
  serial: sirf: make fifo functions static
  serial: mps2-uart: make driver explicitly non-modular
  serial: mvebu-uart: free the IRQ in ->shutdown()
  serial/bcm63xx_uart: use correct alias naming
  ...

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
index e8dd5097dc56..d2da6aa7f27d 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -52,6 +52,9 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl)
 	int value_array[UART_GPIO_MAX];
 	unsigned int count = 0;
 
+	if (gpios == NULL)
+		return;
+
 	for (i = 0; i < UART_GPIO_MAX; i++)
 		if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
 			desc_array[count] = gpios->gpio[i];
@@ -73,6 +76,9 @@ unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
 {
 	enum mctrl_gpio_idx i;
 
+	if (gpios == NULL)
+		return *mctrl;
+
 	for (i = 0; i < UART_GPIO_MAX; i++) {
 		if (gpios->gpio[i] && !mctrl_gpios_desc[i].dir_out) {
 			if (gpiod_get_value(gpios->gpio[i]))
@@ -86,6 +92,27 @@ unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl)
 }
 EXPORT_SYMBOL_GPL(mctrl_gpio_get);
 
+unsigned int
+mctrl_gpio_get_outputs(struct mctrl_gpios *gpios, unsigned int *mctrl)
+{
+	enum mctrl_gpio_idx i;
+
+	if (gpios == NULL)
+		return *mctrl;
+
+	for (i = 0; i < UART_GPIO_MAX; i++) {
+		if (gpios->gpio[i] && mctrl_gpios_desc[i].dir_out) {
+			if (gpiod_get_value(gpios->gpio[i]))
+				*mctrl |= mctrl_gpios_desc[i].mctrl;
+			else
+				*mctrl &= ~mctrl_gpios_desc[i].mctrl;
+		}
+	}
+
+	return *mctrl;
+}
+EXPORT_SYMBOL_GPL(mctrl_gpio_get_outputs);
+
 struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx)
 {
 	struct mctrl_gpios *gpios;
@@ -203,6 +230,9 @@ void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios)
 {
 	enum mctrl_gpio_idx i;
 
+	if (gpios == NULL)
+		return;
+
 	for (i = 0; i < UART_GPIO_MAX; i++) {
 		if (gpios->irq[i])
 			devm_free_irq(gpios->port->dev, gpios->irq[i], gpios);
@@ -218,6 +248,9 @@ void mctrl_gpio_enable_ms(struct mctrl_gpios *gpios)
 {
 	enum mctrl_gpio_idx i;
 
+	if (gpios == NULL)
+		return;
+
 	/* .enable_ms may be called multiple times */
 	if (gpios->mctrl_on)
 		return;
@@ -240,6 +273,9 @@ void mctrl_gpio_disable_ms(struct mctrl_gpios *gpios)
 {
 	enum mctrl_gpio_idx i;
 
+	if (gpios == NULL)
+		return;
+
 	if (!gpios->mctrl_on)
 		return;