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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
phy: phy-can-transceiver: Add support for setting mux
On some boards, for routing CAN signals from controller to transceiver,
muxes might need to be set. Therefore, add support for setting the mux by
reading the mux-states property from the device tree node.
Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Link: https://lore.kernel.org/r/20220408111316.21189-1-a-govindraju@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
authored by
Aswath Govindraju
and committed by
Vinod Koul
e4d43712
31231092
+23
+1
drivers/phy/Kconfig
+1
drivers/phy/Kconfig
+22
drivers/phy/phy-can-transceiver.c
+22
drivers/phy/phy-can-transceiver.c
···
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#include<linux/module.h>
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#include<linux/gpio.h>
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#include<linux/gpio/consumer.h>
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#include <linux/mux/consumer.h>
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struct can_transceiver_data {
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u32 flags;
···
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struct phy *generic_phy;
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struct gpio_desc *standby_gpio;
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struct gpio_desc *enable_gpio;
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struct mux_state *mux_state;
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};
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/* Power on function */
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static int can_transceiver_phy_power_on(struct phy *phy)
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{
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struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy);
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int ret;
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if (can_transceiver_phy->mux_state) {
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ret = mux_state_select(can_transceiver_phy->mux_state);
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if (ret) {
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dev_err(&phy->dev, "Failed to select CAN mux: %d\n", ret);
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return ret;
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}
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}
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if (can_transceiver_phy->standby_gpio)
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gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0);
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if (can_transceiver_phy->enable_gpio)
···
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gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1);
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if (can_transceiver_phy->enable_gpio)
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gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0);
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if (can_transceiver_phy->mux_state)
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mux_state_deselect(can_transceiver_phy->mux_state);
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return 0;
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}
···
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match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node);
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drvdata = match->data;
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if (of_property_read_bool(dev->of_node, "mux-states")) {
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struct mux_state *mux_state;
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mux_state = devm_mux_state_get(dev, NULL);
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if (IS_ERR(mux_state))
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return dev_err_probe(&pdev->dev, PTR_ERR(mux_state),
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"failed to get mux\n");
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can_transceiver_phy->mux_state = mux_state;
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}
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phy = devm_phy_create(dev, dev->of_node,
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&can_transceiver_phy_ops);