msm_serial: Switch clock consumer strings and simplify code

In downstream kernel we've standardized the clock consumer names
that MSM device drivers use. Replace the uart specific clock
names in this driver with the more standard 'core' and 'iface'
names. Also simplify the code by assuming that clk_prepare_enable
and clk_disable_unprepare() will properly check for NULL pointers
(it will because MSM uses the common clock framework).

Cc: David Brown <davidb@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/arm/mach-msm/devices-msm7x00.c

@@ -456,9 +456,9 @@ static struct clk_pcom_desc msm_clocks_7x01a[] = {
 	CLK_PCOM("tsif_ref_clk",	TSIF_REF_CLK,	NULL, 0),
 	CLK_PCOM("tv_dac_clk",	TV_DAC_CLK,	NULL, 0),
 	CLK_PCOM("tv_enc_clk",	TV_ENC_CLK,	NULL, 0),
-	CLK_PCOM("uart_clk",	UART1_CLK,	"msm_serial.0", OFF),
-	CLK_PCOM("uart_clk",	UART2_CLK,	"msm_serial.1", 0),
-	CLK_PCOM("uart_clk",	UART3_CLK,	"msm_serial.2", OFF),
+	CLK_PCOM("core",	UART1_CLK,	"msm_serial.0", OFF),
+	CLK_PCOM("core",	UART2_CLK,	"msm_serial.1", 0),
+	CLK_PCOM("core",	UART3_CLK,	"msm_serial.2", OFF),
 	CLK_PCOM("uart1dm_clk",	UART1DM_CLK,	NULL, OFF),
 	CLK_PCOM("uart2dm_clk",	UART2DM_CLK,	NULL, 0),
 	CLK_PCOM("usb_hs_clk",	USB_HS_CLK,	"msm_hsusb", OFF),

arch/arm/mach-msm/devices-msm7x30.c

@@ -211,7 +211,7 @@ static struct clk_pcom_desc msm_clocks_7x30[] = {
 	CLK_PCOM("spi_pclk",	SPI_P_CLK,	NULL, 0),
 	CLK_PCOM("tv_dac_clk",	TV_DAC_CLK,	NULL, 0),
 	CLK_PCOM("tv_enc_clk",	TV_ENC_CLK,	NULL, 0),
-	CLK_PCOM("uart_clk",	UART2_CLK,	"msm_serial.1", 0),
+	CLK_PCOM("core",	UART2_CLK,	"msm_serial.1", 0),
 	CLK_PCOM("usb_phy_clk",	USB_PHY_CLK,	NULL, 0),
 	CLK_PCOM("usb_hs_clk",		USB_HS_CLK,		NULL, OFF),
 	CLK_PCOM("usb_hs_pclk",		USB_HS_P_CLK,		NULL, OFF),

arch/arm/mach-msm/devices-qsd8x50.c

@@ -358,9 +358,9 @@ static struct clk_pcom_desc msm_clocks_8x50[] = {
 	CLK_PCOM("tsif_ref_clk",	TSIF_REF_CLK,	NULL, 0),
 	CLK_PCOM("tv_dac_clk",	TV_DAC_CLK,	NULL, 0),
 	CLK_PCOM("tv_enc_clk",	TV_ENC_CLK,	NULL, 0),
-	CLK_PCOM("uart_clk",	UART1_CLK,	NULL, OFF),
-	CLK_PCOM("uart_clk",	UART2_CLK,	NULL, 0),
-	CLK_PCOM("uart_clk",	UART3_CLK,	"msm_serial.2", OFF),
+	CLK_PCOM("core",	UART1_CLK,	NULL, OFF),
+	CLK_PCOM("core",	UART2_CLK,	NULL, 0),
+	CLK_PCOM("core",	UART3_CLK,	"msm_serial.2", OFF),
 	CLK_PCOM("uartdm_clk",	UART1DM_CLK,	NULL, OFF),
 	CLK_PCOM("uartdm_clk",	UART2DM_CLK,	NULL, 0),
 	CLK_PCOM("usb_hs_clk",	USB_HS_CLK,	NULL, OFF),

drivers/tty/serial/msm_serial.c

@@ -422,7 +422,6 @@ static void msm_init_clock(struct uart_port *port)
 	struct msm_port *msm_port = UART_TO_MSM(port);
 
 	clk_prepare_enable(msm_port->clk);
-	if (!IS_ERR(msm_port->pclk))
 	clk_prepare_enable(msm_port->pclk);
 	msm_serial_set_mnd_regs(port);
 }
@@ -701,12 +700,10 @@ static void msm_power(struct uart_port *port, unsigned int state,
 	switch (state) {
 	case 0:
 		clk_prepare_enable(msm_port->clk);
-		if (!IS_ERR(msm_port->pclk))
 		clk_prepare_enable(msm_port->pclk);
 		break;
 	case 3:
 		clk_disable_unprepare(msm_port->clk);
-		if (!IS_ERR(msm_port->pclk))
 		clk_disable_unprepare(msm_port->pclk);
 		break;
 	default:
@@ -895,18 +892,12 @@ static int __init msm_serial_probe(struct platform_device *pdev)
 	else
 		msm_port->is_uartdm = 0;
 
-	if (msm_port->is_uartdm) {
-		msm_port->clk = devm_clk_get(&pdev->dev, "gsbi_uart_clk");
-		msm_port->pclk = devm_clk_get(&pdev->dev, "gsbi_pclk");
-	} else {
-		msm_port->clk = devm_clk_get(&pdev->dev, "uart_clk");
-		msm_port->pclk = ERR_PTR(-ENOENT);
-	}
-
+	msm_port->clk = devm_clk_get(&pdev->dev, "core");
 	if (IS_ERR(msm_port->clk))
 		return PTR_ERR(msm_port->clk);
 
 	if (msm_port->is_uartdm) {
+		msm_port->pclk = devm_clk_get(&pdev->dev, "iface");
 		if (IS_ERR(msm_port->pclk))
 			return PTR_ERR(msm_port->pclk);