ARM: davinci: convert platform code to use clk_prepare/clk_unprepare

As a first step towards migrating davinci platforms to use common clock
framework, replace all instances of clk_enable() with clk_prepare_enable()
and clk_disable() with clk_disable_unprepare(). Until the platform is
switched to use the CONFIG_HAVE_CLK_PREPARE Kconfig variable, this just
adds a might_sleep() call and would work without any issues.

This will make it easy later to switch to common clk based implementation
of clk driver from DaVinci specific driver.

Signed-off-by: Murali Karicheri <[e-mail]>
Reviewed-by: Mike Turquette <[e-mail]>
Signed-off-by: Sekhar Nori <[e-mail]>

arch/arm/mach-davinci/board-dm355-evm.c

···
 	if (IS_ERR(aemif))
 		WARN("%s: unable to get AEMIF clock\n", __func__);
 	else
-		clk_enable(aemif);
+		clk_prepare_enable(aemif);
 
 	platform_add_devices(davinci_evm_devices,
 			     ARRAY_SIZE(davinci_evm_devices));

arch/arm/mach-davinci/board-dm355-leopard.c

···
 	if (IS_ERR(aemif))
 		WARN("%s: unable to get AEMIF clock\n", __func__);
 	else
-		clk_enable(aemif);
+		clk_prepare_enable(aemif);
 
 	platform_add_devices(davinci_leopard_devices,
 			     ARRAY_SIZE(davinci_leopard_devices));

arch/arm/mach-davinci/board-dm365-evm.c

···
 	aemif_clk = clk_get(NULL, "aemif");
 	if (IS_ERR(aemif_clk))
 		return;
-	clk_enable(aemif_clk);
+	clk_prepare_enable(aemif_clk);
 
 	if (request_mem_region(DM365_ASYNC_EMIF_DATA_CE1_BASE, SECTION_SIZE,
 			"cpld") == NULL)
···
 				SECTION_SIZE);
 fail:
 		pr_err("ERROR: can't map CPLD\n");
-		clk_disable(aemif_clk);
+		clk_disable_unprepare(aemif_clk);
 		return;
 	}
 

arch/arm/mach-davinci/board-dm644x-evm.c

···
 	struct davinci_soc_info *soc_info = &davinci_soc_info;
 
 	aemif_clk = clk_get(NULL, "aemif");
-	clk_enable(aemif_clk);
+	clk_prepare_enable(aemif_clk);
 
 	if (HAS_ATA) {
 		if (HAS_NAND || HAS_NOR)

arch/arm/mach-davinci/board-neuros-osd2.c

···
 	struct davinci_soc_info *soc_info = &davinci_soc_info;
 
 	aemif_clk = clk_get(NULL, "aemif");
-	clk_enable(aemif_clk);
+	clk_prepare_enable(aemif_clk);
 
 	if (HAS_ATA) {
 		if (HAS_NAND)

arch/arm/mach-davinci/devices-da8xx.c

···
 	if (IS_ERR(da850_sata_clk))
 		return PTR_ERR(da850_sata_clk);
 
-	ret = clk_enable(da850_sata_clk);
+	ret = clk_prepare_enable(da850_sata_clk);
 	if (ret)
 		goto err0;
 
···
 	return 0;
 
 err1:
-	clk_disable(da850_sata_clk);
+	clk_disable_unprepare(da850_sata_clk);
 err0:
 	clk_put(da850_sata_clk);
 	return ret;
···
 
 static void da850_sata_exit(struct device *dev)
 {
-	clk_disable(da850_sata_clk);
+	clk_disable_unprepare(da850_sata_clk);
 	clk_put(da850_sata_clk);
 }
 

arch/arm/mach-davinci/serial.c

···
 			continue;
 		}
 
-		clk_enable(uart_clk);
+		clk_prepare_enable(uart_clk);
 		p->uartclk = clk_get_rate(uart_clk);
 
 		if (!p->membase && p->mapbase) {

arch/arm/mach-davinci/time.c

···
 
 	timer_clk = clk_get(NULL, "timer0");
 	BUG_ON(IS_ERR(timer_clk));
-	clk_enable(timer_clk);
+	clk_prepare_enable(timer_clk);
 
 	/* init timer hw */
 	timer_init();
···
 	wd_clk = clk_get(&pdev->dev, NULL);
 	if (WARN_ON(IS_ERR(wd_clk)))
 		return;
-	clk_enable(wd_clk);
+	clk_prepare_enable(wd_clk);
 
 	/* disable, internal clock source */
 	__raw_writel(0, base + TCR);