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tty: xuartps: disable clocks when not used

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Currently the clocks are enabled at probe and disabled
at remove. Instead enable the clocks when used.

Signed-off-by: Shubhrajyoti Datta <shubhraj@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta 2016-05-27 15:05:19 +05:30 committed by Greg Kroah-Hartman
parent 0058f0871e
commit 210417ce83
1 changed files with 24 additions and 6 deletions
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30
drivers/tty/serial/xilinx_uartps.c
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@ -976,6 +976,23 @@ static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c)
} }
#endif #endif
static void cdns_uart_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct cdns_uart *cdns_uart = port->private_data;
switch (state) {
case UART_PM_STATE_OFF:
clk_disable(cdns_uart->uartclk);
clk_disable(cdns_uart->pclk);
break;
default:
clk_enable(cdns_uart->pclk);
clk_enable(cdns_uart->uartclk);
break;
}
}
static struct uart_ops cdns_uart_ops = { static struct uart_ops cdns_uart_ops = {
.set_mctrl = cdns_uart_set_mctrl, .set_mctrl = cdns_uart_set_mctrl,
.get_mctrl = cdns_uart_get_mctrl, .get_mctrl = cdns_uart_get_mctrl,
@ -987,6 +1004,7 @@ static struct uart_ops cdns_uart_ops = {
.set_termios = cdns_uart_set_termios, .set_termios = cdns_uart_set_termios,
.startup = cdns_uart_startup, .startup = cdns_uart_startup,
.shutdown = cdns_uart_shutdown, .shutdown = cdns_uart_shutdown,
.pm = cdns_uart_pm,
.type = cdns_uart_type, .type = cdns_uart_type,
.verify_port = cdns_uart_verify_port, .verify_port = cdns_uart_verify_port,
.request_port = cdns_uart_request_port, .request_port = cdns_uart_request_port,
@ -1350,12 +1368,12 @@ static int cdns_uart_probe(struct platform_device *pdev)
return PTR_ERR(cdns_uart_data->uartclk); return PTR_ERR(cdns_uart_data->uartclk);
} }
rc = clk_prepare_enable(cdns_uart_data->pclk); rc = clk_prepare(cdns_uart_data->pclk);
if (rc) { if (rc) {
dev_err(&pdev->dev, "Unable to enable pclk clock.\n"); dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
return rc; return rc;
} }
rc = clk_prepare_enable(cdns_uart_data->uartclk); rc = clk_prepare(cdns_uart_data->uartclk);
if (rc) { if (rc) {
dev_err(&pdev->dev, "Unable to enable device clock.\n"); dev_err(&pdev->dev, "Unable to enable device clock.\n");
goto err_out_clk_dis_pclk; goto err_out_clk_dis_pclk;
@ -1422,9 +1440,9 @@ err_out_notif_unreg:
&cdns_uart_data->clk_rate_change_nb); &cdns_uart_data->clk_rate_change_nb);
#endif #endif
err_out_clk_disable: err_out_clk_disable:
clk_disable_unprepare(cdns_uart_data->uartclk); clk_unprepare(cdns_uart_data->uartclk);
err_out_clk_dis_pclk: err_out_clk_dis_pclk:
clk_disable_unprepare(cdns_uart_data->pclk); clk_unprepare(cdns_uart_data->pclk);
return rc; return rc;
} }
@ -1448,8 +1466,8 @@ static int cdns_uart_remove(struct platform_device *pdev)
#endif #endif
rc = uart_remove_one_port(&cdns_uart_uart_driver, port); rc = uart_remove_one_port(&cdns_uart_uart_driver, port);
port->mapbase = 0; port->mapbase = 0;
clk_disable_unprepare(cdns_uart_data->uartclk); clk_unprepare(cdns_uart_data->uartclk);
clk_disable_unprepare(cdns_uart_data->pclk); clk_unprepare(cdns_uart_data->pclk);
return rc; return rc;
} }