clk: keystone: syscon-clk: Add support for AM62 epwm-tbclk

AM62 has 3 instances of EPWM modules. Each EPWM module has
an EPWM TBCLKEN module input used to individually enable or
disable its EPWM time-base clock. The EPWM time-base clock
enable input comes from the CTRLMMR_EPWM_TB_CLKEN register
bits 0 to 2 in CTRL_MMR0 module (6.1.1.4.1.48 [1]). This
is virtually the same setup as in AM64 but with 3 instead
of 9 clock providers on AM62.

Update the driver with the 3 instances of clocks associated
to a new compatible: "ti,am62-epwm-tbclk".

[1] https://www.ti.com/lit/pdf/spruiv7

Signed-off-by: Georgi Vlaev <[e-mail]>
Tested-by: Vignesh Raghavendra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Nishanth Menon <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/keystone/syscon-clk.c

···
 	{ /* Sentinel */ },
 };
 
+static const struct ti_syscon_gate_clk_data am62_clk_data[] = {
+	TI_SYSCON_CLK_GATE("epwm_tbclk0", 0x0, 0),
+	TI_SYSCON_CLK_GATE("epwm_tbclk1", 0x0, 1),
+	TI_SYSCON_CLK_GATE("epwm_tbclk2", 0x0, 2),
+	{ /* Sentinel */ },
+};
+
 static const struct of_device_id ti_syscon_gate_clk_ids[] = {
 	{
 		.compatible = "ti,am654-ehrpwm-tbclk",
···
 	{
 		.compatible = "ti,am64-epwm-tbclk",
 		.data = &am64_clk_data,
+	},
+	{
+		.compatible = "ti,am62-epwm-tbclk",
+		.data = &am62_clk_data,
 	},
 	{ }
 };