diff options
| author | Max Krummenacher <max.krummenacher@toradex.com> | 2016-03-01 16:05:30 +0100 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2018-12-13 10:22:56 +0100 |
| commit | b309df81e26a6ca144429706603a2f4e9880f618 (patch) | |
| tree | b9da31e5ac88e579a4677450b03b339d77a6a72c /arch/arm/mach-imx | |
| parent | 7b115b100eefdcf224f6f4b0cf8ee7c0f1f66ae1 (diff) | |
mach-imx7d.c: use enet_out clk to decide on PHY clock
The i.MX 7 can provide a reference clock to the PHY or use a reference clock
from an external circuit.
If the device-tree node with compatible "fsl,imx7d-fec" has a clock named
enet_out then provide the clock from the i.MX 7, if such a clock is missing
use a clock provided from an external circuit.
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
(cherry picked from commit 73c06d69321c45b69ffc864cbaaa7143da87d186)
(cherry picked from commit d46df0826a9f948f05b71da80aa9397cb9337537)
Diffstat (limited to 'arch/arm/mach-imx')
| -rw-r--r-- | arch/arm/mach-imx/mach-imx7d.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/arch/arm/mach-imx/mach-imx7d.c b/arch/arm/mach-imx/mach-imx7d.c index cfdef8a09aee..36d5954fc353 100644 --- a/arch/arm/mach-imx/mach-imx7d.c +++ b/arch/arm/mach-imx/mach-imx7d.c @@ -5,6 +5,7 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ +#include <linux/clk.h> #include <linux/irqchip.h> #include <linux/mfd/syscon.h> #include <linux/mfd/syscon/imx7-iomuxc-gpr.h> @@ -93,15 +94,38 @@ static void __init imx7d_enet_mdio_fixup(void) static void __init imx7d_enet_clk_sel(void) { + struct device_node *np; + struct clk *enet_out_clk; struct regmap *gpr; + np = of_find_compatible_node(NULL, NULL, "fsl,imx7d-fec"); + if (!np) { + pr_warn("%s: failed to find fec node\n", __func__); + return; + } + + enet_out_clk = of_clk_get_by_name(np, "enet_out"); + gpr = syscon_regmap_lookup_by_compatible("fsl,imx7d-iomuxc-gpr"); + if (!IS_ERR(gpr)) { - regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_TX_CLK_SEL_MASK, 0); - regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_CLK_DIR_MASK, IMX7D_GPR1_ENET1_CLK_DIR_MASK); + if (IS_ERR(enet_out_clk)) { + pr_info("%s: failed to get enet_out clock, assuming ext. clock source\n", __func__); + /* use external clock for PHY */ + regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_TX_CLK_SEL_MASK, IMX7D_GPR1_ENET_TX_CLK_SEL_MASK); + regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_CLK_DIR_MASK, 0); + } else { + pr_info("%s: found enet_out clock, assuming internal clock source\n", __func__); + /* use internal clock generation and output it to PHY */ + regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_TX_CLK_SEL_MASK, 0); + regmap_update_bits(gpr, IOMUXC_GPR1, IMX7D_GPR1_ENET_CLK_DIR_MASK, IMX7D_GPR1_ENET1_CLK_DIR_MASK); + clk_put(enet_out_clk); + + } } else { pr_err("failed to find fsl,imx7d-iomux-gpr regmap\n"); } + of_node_put(np); } static inline void imx7d_enet_init(void) |