pwm: pwm-mediatek: Beautify error messages text

As a cherry-on-top cleanup, make error messages clearer to read
by changing instances of "clock: XXXX failed" to a more readable
"Failed to get XXXX clock". Also add "of" to unsupported period
error.

This is purely a cosmetic change; no "real" functional changes.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Macpaul Lin <macpaul.lin@mediatek.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

Author: AngeloGioacchino Del Regno

drivers/pwm/pwm-mediatek.c

@@ -146,7 +146,7 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
 
 	if (clkdiv > PWM_CLK_DIV_MAX) {
 		pwm_mediatek_clk_disable(chip, pwm);
-		dev_err(chip->dev, "period %d not supported\n", period_ns);
+		dev_err(chip->dev, "period of %d ns not supported\n", period_ns);
 		return -EINVAL;
 	}
 
@@ -229,12 +229,12 @@ static int pwm_mediatek_probe(struct platform_device *pdev)
 	pc->clk_top = devm_clk_get(&pdev->dev, "top");
 	if (IS_ERR(pc->clk_top))
 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk_top),
-				     "clock: top failed\n");
+				     "Failed to get top clock\n");
 
 	pc->clk_main = devm_clk_get(&pdev->dev, "main");
 	if (IS_ERR(pc->clk_main))
 		return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk_main),
-				     "clock: main failed\n");
+				     "Failed to get main clock\n");
 
 	for (i = 0; i < pc->soc->num_pwms; i++) {
 		char name[8];
@@ -244,7 +244,7 @@ static int pwm_mediatek_probe(struct platform_device *pdev)
 		pc->clk_pwms[i] = devm_clk_get(&pdev->dev, name);
 		if (IS_ERR(pc->clk_pwms[i]))
 			return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk_pwms[i]),
-					     "clock: %s failed\n", name);
+					     "Failed to get %s clock\n", name);
 	}
 
 	pc->chip.dev = &pdev->dev;