clk: imx8mq: add PLL monitor output

The PLL monitor is mentioned as a debug feature in the reference manual,
but there are some boards that use this clock output as a reference clock
for board level components. Add support for those clocks in the clock
driver, so this clock output can be used properly.

Note that the VIDEO1, GPU and VPU mux inputs are rotated compared to the
description in the reference manual. The order in this patch has been
empirically validated.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/drivers/clk/imx/clk-imx8mq.c b/drivers/clk/imx/clk-imx8mq.c
index 779ea69..4dd4ae9 100644 (file)
--- a/drivers/clk/imx/clk-imx8mq.c
+++ b/drivers/clk/imx/clk-imx8mq.c
@@ -270,6 +270,14 @@ static const char * const imx8mq_clko1_sels[] = {"osc_25m", "sys1_pll_800m", "os
 static const char * const imx8mq_clko2_sels[] = {"osc_25m", "sys2_pll_200m", "sys1_pll_400m", "sys2_pll_166m",
                                          "sys3_pll_out", "audio_pll1_out", "video_pll1_out", "ckil", };
 
+static const char * const pllout_monitor_sels[] = {"osc_25m", "osc_27m", "dummy", "dummy", "ckil",
+                                                  "audio_pll1_out_monitor", "audio_pll2_out_monitor",
+                                                  "video_pll1_out_monitor", "gpu_pll_out_monitor",
+                                                  "vpu_pll_out_monitor", "arm_pll_out_monitor",
+                                                  "sys_pll1_out_monitor", "sys_pll2_out_monitor",
+                                                  "sys_pll3_out_monitor", "dram_pll_out_monitor",
+                                                  "video_pll2_out_monitor", };
+
 static struct clk_hw_onecell_data *clk_hw_data;
 static struct clk_hw **hws;
 
@@ -399,6 +407,20 @@ static int imx8mq_clocks_probe(struct platform_device *pdev)
        hws[IMX8MQ_SYS2_PLL_500M] = imx_clk_hw_fixed_factor("sys2_pll_500m", "sys2_pll_500m_cg", 1, 2);
        hws[IMX8MQ_SYS2_PLL_1000M] = imx_clk_hw_fixed_factor("sys2_pll_1000m", "sys2_pll_1000m_cg", 1, 1);
 
+       hws[IMX8MQ_CLK_MON_AUDIO_PLL1_DIV] = imx_clk_hw_divider("audio_pll1_out_monitor", "audio_pll1_bypass", base + 0x78, 0, 3);
+       hws[IMX8MQ_CLK_MON_AUDIO_PLL2_DIV] = imx_clk_hw_divider("audio_pll2_out_monitor", "audio_pll2_bypass", base + 0x78, 4, 3);
+       hws[IMX8MQ_CLK_MON_VIDEO_PLL1_DIV] = imx_clk_hw_divider("video_pll1_out_monitor", "video_pll1_bypass", base + 0x78, 8, 3);
+       hws[IMX8MQ_CLK_MON_GPU_PLL_DIV] = imx_clk_hw_divider("gpu_pll_out_monitor", "gpu_pll_bypass", base + 0x78, 12, 3);
+       hws[IMX8MQ_CLK_MON_VPU_PLL_DIV] = imx_clk_hw_divider("vpu_pll_out_monitor", "vpu_pll_bypass", base + 0x78, 16, 3);
+       hws[IMX8MQ_CLK_MON_ARM_PLL_DIV] = imx_clk_hw_divider("arm_pll_out_monitor", "arm_pll_bypass", base + 0x78, 20, 3);
+       hws[IMX8MQ_CLK_MON_SYS_PLL1_DIV] = imx_clk_hw_divider("sys_pll1_out_monitor", "sys1_pll_out", base + 0x7c, 0, 3);
+       hws[IMX8MQ_CLK_MON_SYS_PLL2_DIV] = imx_clk_hw_divider("sys_pll2_out_monitor", "sys2_pll_out", base + 0x7c, 4, 3);
+       hws[IMX8MQ_CLK_MON_SYS_PLL3_DIV] = imx_clk_hw_divider("sys_pll3_out_monitor", "sys3_pll_out", base + 0x7c, 8, 3);
+       hws[IMX8MQ_CLK_MON_DRAM_PLL_DIV] = imx_clk_hw_divider("dram_pll_out_monitor", "dram_pll_out", base + 0x7c, 12, 3);
+       hws[IMX8MQ_CLK_MON_VIDEO_PLL2_DIV] = imx_clk_hw_divider("video_pll2_out_monitor", "video2_pll_out", base + 0x7c, 16, 3);
+       hws[IMX8MQ_CLK_MON_SEL] = imx_clk_hw_mux("pllout_monitor_sel", base + 0x74, 0, 4, pllout_monitor_sels, ARRAY_SIZE(pllout_monitor_sels));
+       hws[IMX8MQ_CLK_MON_CLK2_OUT] = imx_clk_hw_gate("pllout_monitor_clk2", "pllout_monitor_sel", base + 0x74, 4);
+
        np = dev->of_node;
        base = devm_platform_ioremap_resource(pdev, 0);
        if (WARN_ON(IS_ERR(base)))

diff --git a/include/dt-bindings/clock/imx8mq-clock.h b/include/dt-bindings/clock/imx8mq-clock.h
index 9b8045d..82e907c 100644 (file)
--- a/include/dt-bindings/clock/imx8mq-clock.h
+++ b/include/dt-bindings/clock/imx8mq-clock.h
@@ -431,6 +431,20 @@
 
 #define IMX8MQ_CLK_A53_CORE                    289
 
-#define IMX8MQ_CLK_END                         290
+#define IMX8MQ_CLK_MON_AUDIO_PLL1_DIV          290
+#define IMX8MQ_CLK_MON_AUDIO_PLL2_DIV          291
+#define IMX8MQ_CLK_MON_VIDEO_PLL1_DIV          292
+#define IMX8MQ_CLK_MON_GPU_PLL_DIV             293
+#define IMX8MQ_CLK_MON_VPU_PLL_DIV             294
+#define IMX8MQ_CLK_MON_ARM_PLL_DIV             295
+#define IMX8MQ_CLK_MON_SYS_PLL1_DIV            296
+#define IMX8MQ_CLK_MON_SYS_PLL2_DIV            297
+#define IMX8MQ_CLK_MON_SYS_PLL3_DIV            298
+#define IMX8MQ_CLK_MON_DRAM_PLL_DIV            299
+#define IMX8MQ_CLK_MON_VIDEO_PLL2_DIV          300
+#define IMX8MQ_CLK_MON_SEL                     301
+#define IMX8MQ_CLK_MON_CLK2_OUT                        302
+
+#define IMX8MQ_CLK_END                         303
 
 #endif /* __DT_BINDINGS_CLOCK_IMX8MQ_H */