clk: imx6q: add ethernet refclock mux support

Add ethernet refclock mux support and set it to internal clock by
default. This configuration will not affect existing boards since
machine code currently overwrites this default.

The machine code will be fixed in a separate patch.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230131084642.709385-3-o.rempel@pengutronix.de

diff --git a/drivers/clk/imx/clk-imx6q.c b/drivers/clk/imx/clk-imx6q.c
index da71e06..bf4c1d9 100644 (file)
--- a/drivers/clk/imx/clk-imx6q.c
+++ b/drivers/clk/imx/clk-imx6q.c
@@ -12,6 +12,7 @@
 #include <linux/clk-provider.h>
 #include <linux/err.h>
 #include <linux/io.h>
+#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -115,6 +116,10 @@ static struct clk_div_table video_div_table[] = {
        { /* sentinel */ }
 };
 
+static const char * enet_ref_sels[] = { "enet_ref", "enet_ref_pad", };
+static const u32 enet_ref_sels_table[] = { IMX6Q_GPR1_ENET_CLK_SEL_ANATOP, IMX6Q_GPR1_ENET_CLK_SEL_PAD };
+static const u32 enet_ref_sels_table_mask = IMX6Q_GPR1_ENET_CLK_SEL_ANATOP;
+
 static unsigned int share_count_esai;
 static unsigned int share_count_asrc;
 static unsigned int share_count_ssi1;
@@ -908,6 +913,12 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
        if (clk_on_imx6q() && imx_get_soc_revision() == IMX_CHIP_REVISION_1_0)
                hws[IMX6QDL_CLK_GPT_3M] = hws[IMX6QDL_CLK_GPT_IPG_PER];
 
+       hws[IMX6QDL_CLK_ENET_REF_PAD] = imx6q_obtain_fixed_clk_hw(ccm_node, "enet_ref_pad", 0);
+
+       hws[IMX6QDL_CLK_ENET_REF_SEL] = imx_clk_gpr_mux("enet_ref_sel", "fsl,imx6q-iomuxc-gpr",
+                               IOMUXC_GPR1, enet_ref_sels, ARRAY_SIZE(enet_ref_sels),
+                               enet_ref_sels_table, enet_ref_sels_table_mask);
+
        imx_check_clk_hws(hws, IMX6QDL_CLK_END);
 
        of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data);
@@ -974,6 +985,8 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
                               hws[IMX6QDL_CLK_PLL3_USB_OTG]->clk);
        }
 
+       clk_set_parent(hws[IMX6QDL_CLK_ENET_REF_SEL]->clk, hws[IMX6QDL_CLK_ENET_REF]->clk);
+
        imx_register_uart_clocks();
 }
 CLK_OF_DECLARE(imx6q, "fsl,imx6q-ccm", imx6q_clocks_init);

diff --git a/include/dt-bindings/clock/imx6qdl-clock.h b/include/dt-bindings/clock/imx6qdl-clock.h
index e20c43c..e5b2a1b 100644 (file)
--- a/include/dt-bindings/clock/imx6qdl-clock.h
+++ b/include/dt-bindings/clock/imx6qdl-clock.h
@@ -273,6 +273,8 @@
 #define IMX6QDL_CLK_MMDC_P0_IPG                        263
 #define IMX6QDL_CLK_DCIC1                      264
 #define IMX6QDL_CLK_DCIC2                      265
-#define IMX6QDL_CLK_END                                266
+#define IMX6QDL_CLK_ENET_REF_SEL               266
+#define IMX6QDL_CLK_ENET_REF_PAD               267
+#define IMX6QDL_CLK_END                                268
 
 #endif /* __DT_BINDINGS_CLOCK_IMX6QDL_H */