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authorQipan Li <Qipan.Li@csr.com>2014-11-11 20:44:58 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-25 17:06:38 -0800
commit52bec4ed4ef83f1a14dbcfd1a97e35f77c6e261e (patch)
treed927ba80016be050c55d1563d02c1d9c8c0b62fb /drivers/tty
parente620e54884ceb983c38f979a22fd04ae0820c725 (diff)
serial: sirf: add a new uart type support
in CSR A7DA SoC, uart6 located at BT module and it need multiple clock sources, so for "sirf,marco-bt-uart" compatible uarts, drivers take 3 clock sources and enable them. this patch also replaces clk_get by devm_clk_get function and fix DT binding document in which we missed to fix when we added marco platform in commit 909102db44f "serial: sirf: add support for Marco chip". Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/sirfsoc_uart.c34
-rw-r--r--drivers/tty/serial/sirfsoc_uart.h4
2 files changed, 31 insertions, 7 deletions
diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c
index 4102192687ee..2f6c6b04cc8d 100644
--- a/drivers/tty/serial/sirfsoc_uart.c
+++ b/drivers/tty/serial/sirfsoc_uart.c
@@ -1032,10 +1032,19 @@ static void sirfsoc_uart_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct sirfsoc_uart_port *sirfport = to_sirfport(port);
- if (!state)
+ if (!state) {
+ if (sirfport->is_bt_uart) {
+ clk_prepare_enable(sirfport->clk_noc);
+ clk_prepare_enable(sirfport->clk_general);
+ }
clk_prepare_enable(sirfport->clk);
- else
+ } else {
clk_disable_unprepare(sirfport->clk);
+ if (sirfport->is_bt_uart) {
+ clk_disable_unprepare(sirfport->clk_general);
+ clk_disable_unprepare(sirfport->clk_noc);
+ }
+ }
}
static int sirfsoc_uart_startup(struct uart_port *port)
@@ -1378,12 +1387,26 @@ usp_no_flow_control:
}
port->irq = res->start;
- sirfport->clk = clk_get(&pdev->dev, NULL);
+ sirfport->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(sirfport->clk)) {
ret = PTR_ERR(sirfport->clk);
goto err;
}
port->uartclk = clk_get_rate(sirfport->clk);
+ if (of_device_is_compatible(pdev->dev.of_node, "sirf,marco-bt-uart")) {
+ sirfport->clk_general = devm_clk_get(&pdev->dev, "general");
+ if (IS_ERR(sirfport->clk_general)) {
+ ret = PTR_ERR(sirfport->clk_general);
+ goto err;
+ }
+ sirfport->clk_noc = devm_clk_get(&pdev->dev, "noc");
+ if (IS_ERR(sirfport->clk_noc)) {
+ ret = PTR_ERR(sirfport->clk_noc);
+ goto err;
+ }
+ sirfport->is_bt_uart = true;
+ } else
+ sirfport->is_bt_uart = false;
port->ops = &sirfsoc_uart_ops;
spin_lock_init(&port->lock);
@@ -1392,7 +1415,7 @@ usp_no_flow_control:
ret = uart_add_one_port(&sirfsoc_uart_drv, port);
if (ret != 0) {
dev_err(&pdev->dev, "Cannot add UART port(%d).\n", pdev->id);
- goto port_err;
+ goto err;
}
sirfport->rx_dma_chan = dma_request_slave_channel(port->dev, "rx");
@@ -1421,8 +1444,6 @@ alloc_coherent_err:
sirfport->rx_dma_items[j].xmit.buf,
sirfport->rx_dma_items[j].dma_addr);
dma_release_channel(sirfport->rx_dma_chan);
-port_err:
- clk_put(sirfport->clk);
err:
return ret;
}
@@ -1431,7 +1452,6 @@ static int sirfsoc_uart_remove(struct platform_device *pdev)
{
struct sirfsoc_uart_port *sirfport = platform_get_drvdata(pdev);
struct uart_port *port = &sirfport->port;
- clk_put(sirfport->clk);
uart_remove_one_port(&sirfsoc_uart_drv, port);
if (sirfport->rx_dma_chan) {
int i;
diff --git a/drivers/tty/serial/sirfsoc_uart.h b/drivers/tty/serial/sirfsoc_uart.h
index 6a7ebf7ef130..275d03893990 100644
--- a/drivers/tty/serial/sirfsoc_uart.h
+++ b/drivers/tty/serial/sirfsoc_uart.h
@@ -417,6 +417,10 @@ struct sirfsoc_uart_port {
struct uart_port port;
struct clk *clk;
+ /* UART6 for BT usage in A7DA platform need multi-clock source */
+ bool is_bt_uart;
+ struct clk *clk_general;
+ struct clk *clk_noc;
/* for SiRFmarco, there are SET/CLR for UART_INT_EN */
bool is_marco;
struct sirfsoc_uart_register *uart_reg;