mtd: lpc32xx_mlc: fix warnings caused by enabling unprepared clock

If common clock framework is configured, the driver generates a warning,
which is fixed by this change:

    WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:727 clk_core_enable+0x2c/0xa4()
    Modules linked in:
    CPU: 0 PID: 1 Comm: swapper Not tainted 4.3.0-rc2+ #206
    Hardware name: LPC32XX SoC (Flattened Device Tree)
    Backtrace:
    [<>] (dump_backtrace) from [<>] (show_stack+0x18/0x1c)
    [<>] (show_stack) from [<>] (dump_stack+0x20/0x28)
    [<>] (dump_stack) from [<>] (warn_slowpath_common+0x90/0xb8)
    [<>] (warn_slowpath_common) from [<>] (warn_slowpath_null+0x24/0x2c)
    [<>] (warn_slowpath_null) from [<>] (clk_core_enable+0x2c/0xa4)
    [<>] (clk_core_enable) from [<>] (clk_enable+0x24/0x38)
    [<>] (clk_enable) from [<>] (lpc32xx_nand_probe+0x208/0x248)
    [<>] (lpc32xx_nand_probe) from [<>] (platform_drv_probe+0x50/0xa0)
    [<>] (platform_drv_probe) from [<>] (driver_probe_device+0x18c/0x408)
    [<>] (driver_probe_device) from [<>] (__driver_attach+0x70/0x94)
    [<>] (__driver_attach) from [<>] (bus_for_each_dev+0x74/0x98)
    [<>] (bus_for_each_dev) from [<>] (driver_attach+0x20/0x28)
    [<>] (driver_attach) from [<>] (bus_add_driver+0x11c/0x248)
    [<>] (bus_add_driver) from [<>] (driver_register+0xa4/0xe8)
    [<>] (driver_register) from [<>] (__platform_driver_register+0x50/0x64)
    [<>] (__platform_driver_register) from [<>] (lpc32xx_nand_driver_init+0x18/0x20)
    [<>] (lpc32xx_nand_driver_init) from [<>] (do_one_initcall+0x11c/0x1dc)
    [<>] (do_one_initcall) from [<>] (kernel_init_freeable+0x10c/0x1d4)
    [<>] (kernel_init_freeable) from [<>] (kernel_init+0x10/0xec)
    [<>] (kernel_init) from [<>] (ret_from_fork+0x14/0x24)
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/lpc32xx_mlc.c

@@ -692,7 +692,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 		res = -ENOENT;
 		goto err_exit1;
 	}
-	clk_enable(host->clk);
+	clk_prepare_enable(host->clk);
 
 	nand_chip->cmd_ctrl = lpc32xx_nand_cmd_ctrl;
 	nand_chip->dev_ready = lpc32xx_nand_device_ready;
@@ -800,7 +800,7 @@ static int lpc32xx_nand_probe(struct platform_device *pdev)
 	if (use_dma)
 		dma_release_channel(host->dma_chan);
 err_exit2:
-	clk_disable(host->clk);
+	clk_disable_unprepare(host->clk);
 	clk_put(host->clk);
 err_exit1:
 	lpc32xx_wp_enable(host);
@@ -822,7 +822,7 @@ static int lpc32xx_nand_remove(struct platform_device *pdev)
 	if (use_dma)
 		dma_release_channel(host->dma_chan);
 
-	clk_disable(host->clk);
+	clk_disable_unprepare(host->clk);
 	clk_put(host->clk);
 
 	lpc32xx_wp_enable(host);
@@ -837,7 +837,7 @@ static int lpc32xx_nand_resume(struct platform_device *pdev)
 	struct lpc32xx_nand_host *host = platform_get_drvdata(pdev);
 
 	/* Re-enable NAND clock */
-	clk_enable(host->clk);
+	clk_prepare_enable(host->clk);
 
 	/* Fresh init of NAND controller */
 	lpc32xx_nand_setup(host);
@@ -856,7 +856,7 @@ static int lpc32xx_nand_suspend(struct platform_device *pdev, pm_message_t pm)
 	lpc32xx_wp_enable(host);
 
 	/* Disable clock */
-	clk_disable(host->clk);
+	clk_disable_unprepare(host->clk);
 	return 0;
 }