+++ /dev/null
-From a84aa9f23f872176bcd5ce01eaad97a3dd8900d1 Mon Sep 17 00:00:00 2001
-From: Sasha Levin <sashal@kernel.org>
-Date: Fri, 13 Jul 2018 19:47:36 +0300
-Subject: tty/serial: atmel: Change the driver to work under at91-usart MFD
-
-From: Radu Pirea <radu.pirea@microchip.com>
-
-[ Upstream commit c24d25317a7c6bb3053d4c193b3cf57d1e9a3e4b ]
-
-This patch modifies the place where resources and device tree properties
-are searched.
-
-Signed-off-by: Radu Pirea <radu.pirea@microchip.com>
-Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
-Acked-by: Richard Genoud <richard.genoud@gmail.com>
-Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
-Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-Signed-off-by: Lee Jones <lee.jones@linaro.org>
-Signed-off-by: Sasha Levin <sashal@kernel.org>
----
- drivers/tty/serial/Kconfig | 1 +
- drivers/tty/serial/atmel_serial.c | 42 ++++++++++++++++++++-----------
- 2 files changed, 28 insertions(+), 15 deletions(-)
-
-diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
-index df8bd0c7b97db..32886c3046413 100644
---- a/drivers/tty/serial/Kconfig
-+++ b/drivers/tty/serial/Kconfig
-@@ -118,6 +118,7 @@ config SERIAL_ATMEL
- depends on ARCH_AT91 || COMPILE_TEST
- select SERIAL_CORE
- select SERIAL_MCTRL_GPIO if GPIOLIB
-+ select MFD_AT91_USART
- help
- This enables the driver for the on-chip UARTs of the Atmel
- AT91 processors.
-diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
-index dd8949e8fcd7a..251f708f47f76 100644
---- a/drivers/tty/serial/atmel_serial.c
-+++ b/drivers/tty/serial/atmel_serial.c
-@@ -195,8 +195,7 @@ static struct console atmel_console;
-
- #if defined(CONFIG_OF)
- static const struct of_device_id atmel_serial_dt_ids[] = {
-- { .compatible = "atmel,at91rm9200-usart" },
-- { .compatible = "atmel,at91sam9260-usart" },
-+ { .compatible = "atmel,at91rm9200-usart-serial" },
- { /* sentinel */ }
- };
- #endif
-@@ -926,6 +925,7 @@ static void atmel_tx_dma(struct uart_port *port)
- static int atmel_prepare_tx_dma(struct uart_port *port)
- {
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-+ struct device *mfd_dev = port->dev->parent;
- dma_cap_mask_t mask;
- struct dma_slave_config config;
- int ret, nent;
-@@ -933,7 +933,7 @@ static int atmel_prepare_tx_dma(struct uart_port *port)
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-
-- atmel_port->chan_tx = dma_request_slave_channel(port->dev, "tx");
-+ atmel_port->chan_tx = dma_request_slave_channel(mfd_dev, "tx");
- if (atmel_port->chan_tx == NULL)
- goto chan_err;
- dev_info(port->dev, "using %s for tx DMA transfers\n",
-@@ -1104,6 +1104,7 @@ static void atmel_rx_from_dma(struct uart_port *port)
- static int atmel_prepare_rx_dma(struct uart_port *port)
- {
- struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
-+ struct device *mfd_dev = port->dev->parent;
- struct dma_async_tx_descriptor *desc;
- dma_cap_mask_t mask;
- struct dma_slave_config config;
-@@ -1115,7 +1116,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
- dma_cap_zero(mask);
- dma_cap_set(DMA_CYCLIC, mask);
-
-- atmel_port->chan_rx = dma_request_slave_channel(port->dev, "rx");
-+ atmel_port->chan_rx = dma_request_slave_channel(mfd_dev, "rx");
- if (atmel_port->chan_rx == NULL)
- goto chan_err;
- dev_info(port->dev, "using %s for rx DMA transfers\n",
-@@ -2246,8 +2247,8 @@ static const char *atmel_type(struct uart_port *port)
- */
- static void atmel_release_port(struct uart_port *port)
- {
-- struct platform_device *pdev = to_platform_device(port->dev);
-- int size = pdev->resource[0].end - pdev->resource[0].start + 1;
-+ struct platform_device *mpdev = to_platform_device(port->dev->parent);
-+ int size = resource_size(mpdev->resource);
-
- release_mem_region(port->mapbase, size);
-
-@@ -2262,8 +2263,8 @@ static void atmel_release_port(struct uart_port *port)
- */
- static int atmel_request_port(struct uart_port *port)
- {
-- struct platform_device *pdev = to_platform_device(port->dev);
-- int size = pdev->resource[0].end - pdev->resource[0].start + 1;
-+ struct platform_device *mpdev = to_platform_device(port->dev->parent);
-+ int size = resource_size(mpdev->resource);
-
- if (!request_mem_region(port->mapbase, size, "atmel_serial"))
- return -EBUSY;
-@@ -2365,27 +2366,28 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port,
- {
- int ret;
- struct uart_port *port = &atmel_port->uart;
-+ struct platform_device *mpdev = to_platform_device(pdev->dev.parent);
-
- atmel_init_property(atmel_port, pdev);
- atmel_set_ops(port);
-
-- uart_get_rs485_mode(&pdev->dev, &port->rs485);
-+ uart_get_rs485_mode(&mpdev->dev, &port->rs485);
-
- port->iotype = UPIO_MEM;
- port->flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
- port->ops = &atmel_pops;
- port->fifosize = 1;
- port->dev = &pdev->dev;
-- port->mapbase = pdev->resource[0].start;
-- port->irq = pdev->resource[1].start;
-+ port->mapbase = mpdev->resource[0].start;
-+ port->irq = mpdev->resource[1].start;
- port->rs485_config = atmel_config_rs485;
-- port->membase = NULL;
-+ port->membase = NULL;
-
- memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
-
- /* for console, the clock could already be configured */
- if (!atmel_port->clk) {
-- atmel_port->clk = clk_get(&pdev->dev, "usart");
-+ atmel_port->clk = clk_get(&mpdev->dev, "usart");
- if (IS_ERR(atmel_port->clk)) {
- ret = PTR_ERR(atmel_port->clk);
- atmel_port->clk = NULL;
-@@ -2718,13 +2720,22 @@ static void atmel_serial_probe_fifos(struct atmel_uart_port *atmel_port,
- static int atmel_serial_probe(struct platform_device *pdev)
- {
- struct atmel_uart_port *atmel_port;
-- struct device_node *np = pdev->dev.of_node;
-+ struct device_node *np = pdev->dev.parent->of_node;
- void *data;
- int ret = -ENODEV;
- bool rs485_enabled;
-
- BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
-
-+ /*
-+ * In device tree there is no node with "atmel,at91rm9200-usart-serial"
-+ * as compatible string. This driver is probed by at91-usart mfd driver
-+ * which is just a wrapper over the atmel_serial driver and
-+ * spi-at91-usart driver. All attributes needed by this driver are
-+ * found in of_node of parent.
-+ */
-+ pdev->dev.of_node = np;
-+
- ret = of_alias_get_id(np, "serial");
- if (ret < 0)
- /* port id not found in platform data nor device-tree aliases:
-@@ -2860,6 +2871,7 @@ static int atmel_serial_remove(struct platform_device *pdev)
-
- clk_put(atmel_port->clk);
- atmel_port->clk = NULL;
-+ pdev->dev.of_node = NULL;
-
- return ret;
- }
-@@ -2870,7 +2882,7 @@ static struct platform_driver atmel_serial_driver = {
- .suspend = atmel_serial_suspend,
- .resume = atmel_serial_resume,
- .driver = {
-- .name = "atmel_usart",
-+ .name = "atmel_usart_serial",
- .of_match_table = of_match_ptr(atmel_serial_dt_ids),
- },
- };
---
-2.20.1
-