clk: imx8mn: add GPT support

Add support for the General Purpose Timer (GPT) clocks on the i.MX8MN.
The i.MX8MN GPT IP block is the same as on the i.MX8MM, on which this
patch is based.
Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Link: https://lore.kernel.org/r/20220317223600.175894-2-alvin@pqrs.dkSigned-off-by: Abel Vesa <abel.vesa@nxp.com>

drivers/clk/imx/clk-imx8mn.c

@@ -227,6 +227,30 @@ static const char * const imx8mn_pwm4_sels[] = {"osc_24m", "sys_pll2_100m", "sys
 						"sys_pll1_40m", "sys_pll3_out", "clk_ext2",
 						"sys_pll1_80m", "video_pll1_out", };
 
+static const char * const imx8mn_gpt1_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_400m",
+						"sys_pll1_40m", "video_pll1_out", "sys_pll1_80m",
+						"audio_pll1_out", "clk_ext1", };
+
+static const char * const imx8mn_gpt2_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_400m",
+						"sys_pll1_40m", "video_pll1_out", "sys_pll1_80m",
+						"audio_pll1_out", "clk_ext1", };
+
+static const char * const imx8mn_gpt3_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_400m",
+						"sys_pll1_40m", "video_pll1_out", "sys_pll1_80m",
+						"audio_pll1_out", "clk_ext1", };
+
+static const char * const imx8mn_gpt4_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_400m",
+						"sys_pll1_40m", "video_pll1_out", "sys_pll1_80m",
+						"audio_pll1_out", "clk_ext1", };
+
+static const char * const imx8mn_gpt5_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_400m",
+						"sys_pll1_40m", "video_pll1_out", "sys_pll1_80m",
+						"audio_pll1_out", "clk_ext1", };
+
+static const char * const imx8mn_gpt6_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_400m",
+						"sys_pll1_40m", "video_pll1_out", "sys_pll1_80m",
+						"audio_pll1_out", "clk_ext1", };
+
 static const char * const imx8mn_wdog_sels[] = {"osc_24m", "sys_pll1_133m", "sys_pll1_160m",
 						"vpu_pll_out", "sys_pll2_125m", "sys_pll3_out",
 						"sys_pll1_80m", "sys_pll2_166m", };
@@ -476,6 +500,12 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
 	hws[IMX8MN_CLK_PWM2] = imx8m_clk_hw_composite("pwm2", imx8mn_pwm2_sels, base + 0xb400);
 	hws[IMX8MN_CLK_PWM3] = imx8m_clk_hw_composite("pwm3", imx8mn_pwm3_sels, base + 0xb480);
 	hws[IMX8MN_CLK_PWM4] = imx8m_clk_hw_composite("pwm4", imx8mn_pwm4_sels, base + 0xb500);
+	hws[IMX8MN_CLK_GPT1] = imx8m_clk_hw_composite("gpt1", imx8mn_gpt1_sels, base + 0xb580);
+	hws[IMX8MN_CLK_GPT2] = imx8m_clk_hw_composite("gpt2", imx8mn_gpt2_sels, base + 0xb600);
+	hws[IMX8MN_CLK_GPT3] = imx8m_clk_hw_composite("gpt3", imx8mn_gpt3_sels, base + 0xb680);
+	hws[IMX8MN_CLK_GPT4] = imx8m_clk_hw_composite("gpt4", imx8mn_gpt4_sels, base + 0xb700);
+	hws[IMX8MN_CLK_GPT5] = imx8m_clk_hw_composite("gpt5", imx8mn_gpt5_sels, base + 0xb780);
+	hws[IMX8MN_CLK_GPT6] = imx8m_clk_hw_composite("gpt6", imx8mn_gpt6_sels, base + 0xb800);
 	hws[IMX8MN_CLK_WDOG] = imx8m_clk_hw_composite("wdog", imx8mn_wdog_sels, base + 0xb900);
 	hws[IMX8MN_CLK_WRCLK] = imx8m_clk_hw_composite("wrclk", imx8mn_wrclk_sels, base + 0xb980);
 	hws[IMX8MN_CLK_CLKO1] = imx8m_clk_hw_composite("clko1", imx8mn_clko1_sels, base + 0xba00);
@@ -501,6 +531,12 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
 	hws[IMX8MN_CLK_GPIO3_ROOT] = imx_clk_hw_gate4("gpio3_root_clk", "ipg_root", base + 0x40d0, 0);
 	hws[IMX8MN_CLK_GPIO4_ROOT] = imx_clk_hw_gate4("gpio4_root_clk", "ipg_root", base + 0x40e0, 0);
 	hws[IMX8MN_CLK_GPIO5_ROOT] = imx_clk_hw_gate4("gpio5_root_clk", "ipg_root", base + 0x40f0, 0);
+	hws[IMX8MN_CLK_GPT1_ROOT] = imx_clk_hw_gate4("gpt1_root_clk", "gpt1", base + 0x4100, 0);
+	hws[IMX8MN_CLK_GPT2_ROOT] = imx_clk_hw_gate4("gpt2_root_clk", "gpt2", base + 0x4110, 0);
+	hws[IMX8MN_CLK_GPT3_ROOT] = imx_clk_hw_gate4("gpt3_root_clk", "gpt3", base + 0x4120, 0);
+	hws[IMX8MN_CLK_GPT4_ROOT] = imx_clk_hw_gate4("gpt4_root_clk", "gpt4", base + 0x4130, 0);
+	hws[IMX8MN_CLK_GPT5_ROOT] = imx_clk_hw_gate4("gpt5_root_clk", "gpt5", base + 0x4140, 0);
+	hws[IMX8MN_CLK_GPT6_ROOT] = imx_clk_hw_gate4("gpt6_root_clk", "gpt6", base + 0x4150, 0);
 	hws[IMX8MN_CLK_I2C1_ROOT] = imx_clk_hw_gate4("i2c1_root_clk", "i2c1", base + 0x4170, 0);
 	hws[IMX8MN_CLK_I2C2_ROOT] = imx_clk_hw_gate4("i2c2_root_clk", "i2c2", base + 0x4180, 0);
 	hws[IMX8MN_CLK_I2C3_ROOT] = imx_clk_hw_gate4("i2c3_root_clk", "i2c3", base + 0x4190, 0);
@@ -548,6 +584,8 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
 	hws[IMX8MN_CLK_SDMA3_ROOT] = imx_clk_hw_gate4("sdma3_clk", "ipg_audio_root", base + 0x45f0, 0);
 	hws[IMX8MN_CLK_SAI7_ROOT] = imx_clk_hw_gate2_shared2("sai7_root_clk", "sai7", base + 0x4650, 0, &share_count_sai7);
 
+	hws[IMX8MN_CLK_GPT_3M] = imx_clk_hw_fixed_factor("gpt_3m", "osc_24m", 1, 8);
+
 	hws[IMX8MN_CLK_DRAM_ALT_ROOT] = imx_clk_hw_fixed_factor("dram_alt_root", "dram_alt", 1, 4);
 
 	hws[IMX8MN_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_core",