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), }, };