[PATCH 4.19 030/205] serial: 8250_of: Fix for lack of interrupt support

Greg Kroah-Hartman
2018-11-19T16:31:27Z

From: John Garry <john.garry@huawei.com>

[ Upstream commit a27d938251ef40c43db81af16fc26b2cec181d4d ]

In commit c58caaab3bf8 ("serial: 8250: of: Defer probe on missing IRQ"), a
check was added for the UART driver being probed prior to the parent IRQ
controller.

Unfortunately this breaks certain boards which have no interrupt support,
like Huawei D03.

Indeed, the 8250 DT bindings state that interrupts should be supported -
not must.

To fix, switch from irq_of_parse_and_map() to of_irq_get(), which
does relay whether the IRQ host controller domain is not ready, i.e.
defer probe, instead of assuming it.

Fixes: c58caaab3bf8 ("serial: 8250: of: Defer probe on missing IRQ")
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/8250/8250_of.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)

--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -58,7 +58,7 @@ static int of_platform_serial_setup(stru
struct resource resource;
struct device_node *np = ofdev->dev.of_node;
u32 clk, spd, prop;
- int ret;
+ int ret, irq;

memset(port, 0, sizeof *port);

@@ -143,21 +143,27 @@ static int of_platform_serial_setup(stru
if (ret >= 0)
port->line = ret;

- port->irq = irq_of_parse_and_map(np, 0);
- if (!port->irq) {
- ret = -EPROBE_DEFER;
- goto err_unprepare;
+ irq = of_irq_get(np, 0);
+ if (irq < 0) {
+ if (irq == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto err_unprepare;
+ }
+ /* IRQ support not mandatory */
+ irq = 0;
}

+ port->irq = irq;
+
info->rst = devm_reset_control_get_optional_shared(&ofdev->dev, NULL);
if (IS_ERR(info->rst)) {
ret = PTR_ERR(info->rst);
- goto err_dispose;
+ goto err_unprepare;
}

ret = reset_control_deassert(info->rst);
if (ret)
- goto err_dispose;
+ goto err_unprepare;

port->type = type;
port->uartclk = clk;
@@ -184,8 +190,6 @@ static int of_platform_serial_setup(stru
port->handle_irq = fsl8250_handle_irq;

return 0;
-err_dispose:
- irq_dispose_mapping(port->irq);
err_unprepare:
clk_disable_unprepare(info->clk);