| Message ID | 1547484866-3600-1-git-send-email-lollivier@baylibre.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | tty: serial: meson: if no alias specified use an available id | expand |
On 14/01/2019 17:54, Loys Ollivier wrote: > At probe, the uart driver tries to get an id from a device tree alias. > When no alias was specified, the driver would return an error and probing > would fail. > > Providing an alias for registering a serial device should not be mandatory. > If the device tree does not specify an alias, provide an id from a reserved > range so that the probing can continue. > > Signed-off-by: Loys Ollivier <lollivier@baylibre.com> > --- > drivers/tty/serial/meson_uart.c | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c > index 8a842591b37c..fbc5bc022a39 100644 > --- a/drivers/tty/serial/meson_uart.c > +++ b/drivers/tty/serial/meson_uart.c > @@ -72,7 +72,8 @@ > #define AML_UART_BAUD_USE BIT(23) > #define AML_UART_BAUD_XTAL BIT(24) > > -#define AML_UART_PORT_NUM 6 > +#define AML_UART_PORT_NUM 12 > +#define AML_UART_PORT_OFFSET 6 > #define AML_UART_DEV_NAME "ttyAML" > > > @@ -654,10 +655,20 @@ static int meson_uart_probe(struct platform_device *pdev) > struct resource *res_mem, *res_irq; > struct uart_port *port; > int ret = 0; > + int id = -1; > > if (pdev->dev.of_node) > pdev->id = of_alias_get_id(pdev->dev.of_node, "serial"); > > + if (pdev->id < 0) { > + for (id = AML_UART_PORT_OFFSET; id < AML_UART_PORT_NUM; id++) { > + if (!meson_ports[id]) { > + pdev->id = id; > + break; > + } > + } > + } > + > if (pdev->id < 0 || pdev->id >= AML_UART_PORT_NUM) > return -EINVAL; > > This is welcome ! You could also add: Suggested-by: Rob Herring <robh@kernel.org> Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Neil
diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c index 8a842591b37c..fbc5bc022a39 100644 --- a/drivers/tty/serial/meson_uart.c +++ b/drivers/tty/serial/meson_uart.c @@ -72,7 +72,8 @@ #define AML_UART_BAUD_USE BIT(23) #define AML_UART_BAUD_XTAL BIT(24) -#define AML_UART_PORT_NUM 6 +#define AML_UART_PORT_NUM 12 +#define AML_UART_PORT_OFFSET 6 #define AML_UART_DEV_NAME "ttyAML" @@ -654,10 +655,20 @@ static int meson_uart_probe(struct platform_device *pdev) struct resource *res_mem, *res_irq; struct uart_port *port; int ret = 0; + int id = -1; if (pdev->dev.of_node) pdev->id = of_alias_get_id(pdev->dev.of_node, "serial"); + if (pdev->id < 0) { + for (id = AML_UART_PORT_OFFSET; id < AML_UART_PORT_NUM; id++) { + if (!meson_ports[id]) { + pdev->id = id; + break; + } + } + } + if (pdev->id < 0 || pdev->id >= AML_UART_PORT_NUM) return -EINVAL;
At probe, the uart driver tries to get an id from a device tree alias. When no alias was specified, the driver would return an error and probing would fail. Providing an alias for registering a serial device should not be mandatory. If the device tree does not specify an alias, provide an id from a reserved range so that the probing can continue. Signed-off-by: Loys Ollivier <lollivier@baylibre.com> --- drivers/tty/serial/meson_uart.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)