clk: imx6ul: 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.

clock tree before this patch:
fec1 <- enet1_ref_125m (gate) <- enet1_ref (divider) <-,
                                                       |- pll6_enet
fec2 <- enet2_ref_125m (gate) <- enet2_ref (divider) <-´

after this patch:
fec1 <- enet1_ref_sel(mux) <- enet1_ref_125m (gate) <- ...
               `--<> enet1_ref_pad                      |- pll6_enet
fec2 <- enet2_ref_sel(mux) <- enet2_ref_125m (gate) <- ...
               `--<> enet2_ref_pad

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Lee Jones <lee@kernel.org>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230131084642.709385-17-o.rempel@pengutronix.de

diff --git a/drivers/clk/imx/clk-imx6ul.c b/drivers/clk/imx/clk-imx6ul.c
index c3c465c1b0e7720445278f7a4a1cc91dc60b87c4..2836adb817b70e85c01009926003355506e07ce5 100644 (file)
--- a/drivers/clk/imx/clk-imx6ul.c
+++ b/drivers/clk/imx/clk-imx6ul.c
@@ -10,6 +10,7 @@
 #include <linux/err.h>
 #include <linux/init.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>
@@ -94,6 +95,17 @@ static const struct clk_div_table video_div_table[] = {
        { }
 };
 
+static const char * enet1_ref_sels[] = { "enet1_ref_125m", "enet1_ref_pad", };
+static const u32 enet1_ref_sels_table[] = { IMX6UL_GPR1_ENET1_TX_CLK_DIR,
+                                           IMX6UL_GPR1_ENET1_CLK_SEL };
+static const u32 enet1_ref_sels_table_mask = IMX6UL_GPR1_ENET1_TX_CLK_DIR |
+                                            IMX6UL_GPR1_ENET1_CLK_SEL;
+static const char * enet2_ref_sels[] = { "enet2_ref_125m", "enet2_ref_pad", };
+static const u32 enet2_ref_sels_table[] = { IMX6UL_GPR1_ENET2_TX_CLK_DIR,
+                                           IMX6UL_GPR1_ENET2_CLK_SEL };
+static const u32 enet2_ref_sels_table_mask = IMX6UL_GPR1_ENET2_TX_CLK_DIR |
+                                            IMX6UL_GPR1_ENET2_CLK_SEL;
+
 static u32 share_count_asrc;
 static u32 share_count_audio;
 static u32 share_count_sai1;
@@ -472,6 +484,17 @@ static void __init imx6ul_clocks_init(struct device_node *ccm_node)
        /* mask handshake of mmdc */
        imx_mmdc_mask_handshake(base, 0);
 
+       hws[IMX6UL_CLK_ENET1_REF_PAD] = imx_obtain_fixed_of_clock(ccm_node, "enet1_ref_pad", 0);
+
+       hws[IMX6UL_CLK_ENET1_REF_SEL] = imx_clk_gpr_mux("enet1_ref_sel", "fsl,imx6ul-iomuxc-gpr",
+                               IOMUXC_GPR1, enet1_ref_sels, ARRAY_SIZE(enet1_ref_sels),
+                               enet1_ref_sels_table, enet1_ref_sels_table_mask);
+       hws[IMX6UL_CLK_ENET2_REF_PAD] = imx_obtain_fixed_of_clock(ccm_node, "enet2_ref_pad", 0);
+
+       hws[IMX6UL_CLK_ENET2_REF_SEL] = imx_clk_gpr_mux("enet2_ref_sel", "fsl,imx6ul-iomuxc-gpr",
+                               IOMUXC_GPR1, enet2_ref_sels, ARRAY_SIZE(enet2_ref_sels),
+                               enet2_ref_sels_table, enet2_ref_sels_table_mask);
+
        imx_check_clk_hws(hws, IMX6UL_CLK_END);
 
        of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data);
@@ -516,6 +539,9 @@ static void __init imx6ul_clocks_init(struct device_node *ccm_node)
                clk_set_parent(hws[IMX6ULL_CLK_EPDC_PRE_SEL]->clk, hws[IMX6UL_CLK_PLL3_PFD2]->clk);
 
        clk_set_parent(hws[IMX6UL_CLK_ENFC_SEL]->clk, hws[IMX6UL_CLK_PLL2_PFD2]->clk);
+
+       clk_set_parent(hws[IMX6UL_CLK_ENET1_REF_SEL]->clk, hws[IMX6UL_CLK_ENET_REF]->clk);
+       clk_set_parent(hws[IMX6UL_CLK_ENET2_REF_SEL]->clk, hws[IMX6UL_CLK_ENET2_REF]->clk);
 }
 
 CLK_OF_DECLARE(imx6ul, "fsl,imx6ul-ccm", imx6ul_clocks_init);

diff --git a/include/dt-bindings/clock/imx6ul-clock.h b/include/dt-bindings/clock/imx6ul-clock.h
index b44920f1edb0dbc89dc35163f97d8ea8f0a333b6..66239ebc0e23386b454f03e2d831c21dc9f348ae 100644 (file)
--- a/include/dt-bindings/clock/imx6ul-clock.h
+++ b/include/dt-bindings/clock/imx6ul-clock.h
@@ -257,7 +257,11 @@
 #define IMX6UL_CLK_GPIO5               248
 #define IMX6UL_CLK_MMDC_P1_IPG         249
 #define IMX6UL_CLK_ENET1_REF_125M      250
+#define IMX6UL_CLK_ENET1_REF_SEL       251
+#define IMX6UL_CLK_ENET1_REF_PAD       252
+#define IMX6UL_CLK_ENET2_REF_SEL       253
+#define IMX6UL_CLK_ENET2_REF_PAD       254
 
-#define IMX6UL_CLK_END                 251
+#define IMX6UL_CLK_END                 255
 
 #endif /* __DT_BINDINGS_CLOCK_IMX6UL_H */

diff --git a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
index d4b5e527a7a3bb81b98a85e0cf1aea4d70d1dc31..09c6b3184bb0478ffbd5b87c3dcb9edcddec2d61 100644 (file)
--- a/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
+++ b/include/linux/mfd/syscon/imx6q-iomuxc-gpr.h
@@ -451,8 +451,10 @@
 #define IMX6SX_GPR12_PCIE_RX_EQ_2                      (0x2 << 0)
 
 /* For imx6ul iomux gpr register field define */
-#define IMX6UL_GPR1_ENET1_CLK_DIR              (0x1 << 17)
-#define IMX6UL_GPR1_ENET2_CLK_DIR              (0x1 << 18)
+#define IMX6UL_GPR1_ENET2_TX_CLK_DIR           BIT(18)
+#define IMX6UL_GPR1_ENET1_TX_CLK_DIR           BIT(17)
+#define IMX6UL_GPR1_ENET2_CLK_SEL              BIT(14)
+#define IMX6UL_GPR1_ENET1_CLK_SEL              BIT(13)
 #define IMX6UL_GPR1_ENET1_CLK_OUTPUT           (0x1 << 17)
 #define IMX6UL_GPR1_ENET2_CLK_OUTPUT           (0x1 << 18)
 #define IMX6UL_GPR1_ENET_CLK_DIR               (0x3 << 17)