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tty: serial: meson: Use devm_clk_get_enabled() helper

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The devm_clk_get_enabled() helper:
   - calls devm_clk_get()
   - calls clk_prepare_enable() and registers what is needed in order to
     call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code, the error handling paths and avoid the need of
a dedicated function used with devm_add_action_or_reset().

That said, meson_uart_probe_clock() is now more or less the same as
devm_clk_get_enabled(), so use this function directly instead.

This also fixes an (unlikely) unchecked devm_add_action_or_reset() error.

Based on my test with allyesconfig, this reduces the .o size from:
   text	   data	    bss	    dec	    hex	filename
   16350	   5016	    128	  21494	   53f6	drivers/tty/serial/meson_uart.o
down to:
   15415	   4784	    128	  20327	   4f67	drivers/tty/serial/meson_uart.o

Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/3f18638cb3cf08ed8817addca1402ed5e3bd3602.1661328361.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christophe JAILLET 2022-08-24 10:06:21 +02:00 committed by Greg Kroah-Hartman
parent 70d15f216e
commit 4f1b576d70
1 changed files with 3 additions and 26 deletions
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29
drivers/tty/serial/meson_uart.c
View File

@ -667,29 +667,6 @@ static struct uart_driver meson_uart_driver = {
.cons = MESON_SERIAL_CONSOLE,
};
static inline struct clk *meson_uart_probe_clock(struct device *dev,
const char *id)
{
struct clk *clk = NULL;
int ret;
clk = devm_clk_get(dev, id);
if (IS_ERR(clk))
return clk;
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(dev, "couldn't enable clk\n");
return ERR_PTR(ret);
}
devm_add_action_or_reset(dev,
(void(*)(void *))clk_disable_unprepare,
clk);
return clk;
}
static int meson_uart_probe_clocks(struct platform_device *pdev,
struct uart_port *port)
{
@ -697,15 +674,15 @@ static int meson_uart_probe_clocks(struct platform_device *pdev,
struct clk *clk_pclk = NULL;
struct clk *clk_baud = NULL;
clk_pclk = meson_uart_probe_clock(&pdev->dev, "pclk");
clk_pclk = devm_clk_get_enabled(&pdev->dev, "pclk");
if (IS_ERR(clk_pclk))
return PTR_ERR(clk_pclk);
clk_xtal = meson_uart_probe_clock(&pdev->dev, "xtal");
clk_xtal = devm_clk_get_enabled(&pdev->dev, "xtal");
if (IS_ERR(clk_xtal))
return PTR_ERR(clk_xtal);
clk_baud = meson_uart_probe_clock(&pdev->dev, "baud");
clk_baud = devm_clk_get_enabled(&pdev->dev, "baud");
if (IS_ERR(clk_baud))
return PTR_ERR(clk_baud);