spi: bcm2835: Use helper function devm_clk_get_enabled()

Since commit 7ef9651e ("clk: Provide new devm_clk helpers for prepared
and enabled clocks"), devm_clk_get() and clk_prepare_enable() can now be
replaced by devm_clk_get_enabled() when driver enables (and possibly
prepares) the clocks for the whole lifetime of the device. Moreover, it is
no longer necessary to unprepare and disable the clocks explicitly.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Li Zetao <lizetao1@huawei.com>
Link: https://lore.kernel.org/r/20230823133938.1359106-7-lizetao1@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-bcm2835.c

@@ -1352,7 +1352,7 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
 	if (IS_ERR(bs->regs))
 		return PTR_ERR(bs->regs);
 
-	bs->clk = devm_clk_get(&pdev->dev, NULL);
+	bs->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(bs->clk))
 		return dev_err_probe(&pdev->dev, PTR_ERR(bs->clk),
 				     "could not get clk\n");
@@ -1363,14 +1363,11 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
 	if (bs->irq < 0)
 		return bs->irq;
 
-	err = clk_prepare_enable(bs->clk);
-	if (err)
-		return err;
 	bs->clk_hz = clk_get_rate(bs->clk);
 
 	err = bcm2835_dma_init(ctlr, &pdev->dev, bs);
 	if (err)
-		goto out_clk_disable;
+		return err;
 
 	/* initialise the hardware with the default polarities */
 	bcm2835_wr(bs, BCM2835_SPI_CS,
@@ -1396,8 +1393,6 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
 
 out_dma_release:
 	bcm2835_dma_release(ctlr, bs);
-out_clk_disable:
-	clk_disable_unprepare(bs->clk);
 	return err;
 }
 
@@ -1415,8 +1410,6 @@ static void bcm2835_spi_remove(struct platform_device *pdev)
 	/* Clear FIFOs, and disable the HW block */
 	bcm2835_wr(bs, BCM2835_SPI_CS,
 		   BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
-
-	clk_disable_unprepare(bs->clk);
 }
 
 static const struct of_device_id bcm2835_spi_match[] = {