[PATCH 4/5] serial: stm32: update wakeup IRQ management

[Erwan Le Ray]

From: Alexandre Torgue <alexandre.tor...@foss.st.com>

The wakeup specific IRQ management is no more needed to wake up the stm32
plaform. A relationship has been established between the EXTI and
the EVENT IRQ, just need to declare the EXTI interrupt instead of the
UART event IRQ.

Signed-off-by: Alexandre Torgue <alexandre.tor...@foss.st.com>
Signed-off-by: Erwan Le Ray <erwan.le...@foss.st.com>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index cc054f07bd83..cba4f4ddf164 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -924,7 +924,7 @@ static void stm32_usart_set_termios(struct uart_port *port,
        }
 
        /* Configure wake up from low power on start bit detection */
-       if (stm32_port->wakeirq > 0) {
+       if (stm32_port->wakeup_src) {
                cr3 &= ~USART_CR3_WUS_MASK;
                cr3 |= USART_CR3_WUS_START_BIT;
        }
@@ -1044,11 +1044,8 @@ static int stm32_usart_init_port(struct stm32_port 
*stm32port,
        if (ret)
                return ret;
 
-       if (stm32port->info->cfg.has_wakeup) {
-               stm32port->wakeirq = platform_get_irq_optional(pdev, 1);
-               if (stm32port->wakeirq <= 0 && stm32port->wakeirq != -ENXIO)
-                       return stm32port->wakeirq ? : -ENODEV;
-       }
+       stm32port->wakeup_src = stm32port->info->cfg.has_wakeup &&
+               of_property_read_bool(pdev->dev.of_node, "wakeup-source");
 
        stm32port->fifoen = stm32port->info->cfg.has_fifo;
 
@@ -1283,17 +1280,11 @@ static int stm32_usart_serial_probe(struct 
platform_device *pdev)
        if (ret)
                return ret;
 
-       if (stm32port->wakeirq > 0) {
-               ret = device_init_wakeup(&pdev->dev, true);
-               if (ret)
-                       goto err_uninit;
-
-               ret = dev_pm_set_dedicated_wake_irq(&pdev->dev,
-                                                   stm32port->wakeirq);
+       if (stm32port->wakeup_src) {
+               device_set_wakeup_capable(&pdev->dev, true);
+               ret = dev_pm_set_wake_irq(&pdev->dev, stm32port->port.irq);
                if (ret)
                        goto err_nowup;
-
-               device_set_wakeup_enable(&pdev->dev, false);
        }
 
        ret = stm32_usart_of_dma_rx_probe(stm32port, pdev);
@@ -1343,14 +1334,13 @@ static int stm32_usart_serial_probe(struct 
platform_device *pdev)
                                  TX_BUF_L, stm32port->tx_buf,
                                  stm32port->tx_dma_buf);
 
-       if (stm32port->wakeirq > 0)
+       if (stm32port->wakeup_src)
                dev_pm_clear_wake_irq(&pdev->dev);
 
 err_nowup:
-       if (stm32port->wakeirq > 0)
-               device_init_wakeup(&pdev->dev, false);
+       if (stm32port->wakeup_src)
+               device_set_wakeup_capable(&pdev->dev, false);
 
-err_uninit:
        stm32_usart_deinit_port(stm32port);
 
        return ret;
@@ -1396,7 +1386,7 @@ static int stm32_usart_serial_remove(struct 
platform_device *pdev)
                                  TX_BUF_L, stm32_port->tx_buf,
                                  stm32_port->tx_dma_buf);
 
-       if (stm32_port->wakeirq > 0) {
+       if (stm32_port->wakeup_src) {
                dev_pm_clear_wake_irq(&pdev->dev);
                device_init_wakeup(&pdev->dev, false);
        }
@@ -1512,7 +1502,7 @@ static void __maybe_unused 
stm32_usart_serial_en_wakeup(struct uart_port *port,
        struct stm32_port *stm32_port = to_stm32_port(port);
        const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
 
-       if (stm32_port->wakeirq <= 0)
+       if (!stm32_port->wakeup_src)
                return;
 
        /*
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 94b568aa46bb..a86773f1a4c4 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -269,7 +269,7 @@ struct stm32_port {
        bool tx_dma_busy;        /* dma tx busy               */
        bool hw_flow_control;
        bool fifoen;
-       int wakeirq;
+       bool wakeup_src;
        int rdr_mask;           /* receive data register mask */
        struct mctrl_gpios *gpios; /* modem control gpios */
 };
-- 
2.17.1