HACK: clk-bcm2835: Add BCM2838_CLOCK_EMMC2 support

The new BCM2838 supports an additional emmc2 clock. So add a new
compatible to register this clock only for BCM2838.

Signed-off-by: Stefan Wahren <[email protected]>

Author: lategoodbye

drivers/clk/bcm/clk-bcm2835.c

@@ -124,6 +124,8 @@
 #define CM_AVEODIV		0x1bc
 #define CM_EMMCCTL		0x1c0
 #define CM_EMMCDIV		0x1c4
+#define CM_EMMC2CTL		0x1d0
+#define CM_EMMC2DIV		0x1d4
 
 /* General bits for the CM_*CTL regs */
 # define CM_ENABLE			BIT(4)
@@ -2047,6 +2049,15 @@ static const struct bcm2835_clk_desc clk_desc_array[] = {
 		.frac_bits = 8,
 		.tcnt_mux = 39),
 
+	/* EMMC2 clock (only available for BCM2838) */
+	[BCM2838_CLOCK_EMMC2]	= REGISTER_PER_CLK(
+		.name = "emmc2",
+		.ctl_reg = CM_EMMC2CTL,
+		.div_reg = CM_EMMC2DIV,
+		.int_bits = 4,
+		.frac_bits = 8,
+		.tcnt_mux = 42),
+
 	/* General purpose (GPIO) clocks */
 	[BCM2835_CLOCK_GP0]	= REGISTER_PER_CLK(
 		.name = "gp0",
@@ -2276,8 +2287,12 @@ static int bcm2835_clk_probe(struct platform_device *pdev)
 
 	for (i = 0; i < asize; i++) {
 		desc = &clk_desc_array[i];
-		if (desc->clk_register && desc->data)
-			hws[i] = desc->clk_register(cprman, desc->data);
+		if (desc->clk_register && desc->data) {
+			if ((i != BCM2838_CLOCK_EMMC2) ||
+			    of_device_is_compatible(fw_node, "brcm,bcm2838-cprman")) {
+				hws[i] = desc->clk_register(cprman, desc->data);
+			}
+		}
 	}
 
 	ret = bcm2835_mark_sdc_parent_critical(hws[BCM2835_CLOCK_SDRAM]->clk);
@@ -2297,6 +2312,7 @@ static int bcm2835_clk_probe(struct platform_device *pdev)
 
 static const struct of_device_id bcm2835_clk_of_match[] = {
 	{ .compatible = "brcm,bcm2835-cprman", },
+	{ .compatible = "brcm,bcm2838-cprman", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, bcm2835_clk_of_match);

include/dt-bindings/clock/bcm2835.h

@@ -66,3 +66,5 @@
 #define BCM2835_CLOCK_DSI1E		48
 #define BCM2835_CLOCK_DSI0P		49
 #define BCM2835_CLOCK_DSI1P		50
+
+#define BCM2838_CLOCK_EMMC2		51