* [PATCH v2 0/2] CAN: Add support for setting mux @ 2021-12-14 14:29 Aswath Govindraju 2021-12-14 14:29 ` [PATCH v2 1/2] dt-bindings: phy: ti,tcan104x-can: Document mux-states property Aswath Govindraju 2021-12-14 14:29 ` [PATCH v2 2/2] phy: phy-can-transceiver: Add support for setting mux Aswath Govindraju 0 siblings, 2 replies; 5+ messages in thread From: Aswath Govindraju @ 2021-12-14 14:29 UTC (permalink / raw) Cc: Aswath Govindraju, Wolfgang Grandegger, Marc Kleine-Budde, Kishon Vijay Abraham I, Vinod Koul, Rob Herring, linux-can, linux-phy, devicetree, linux-kernel The following series of patches add support for setting muxes to route signals from CAN controller to transceiver by reading the property mux-states from the device tree node The following series of patches are dependent on, - https://lkml.org/lkml/2021/12/2/423 Changes since v1: - Fixed the description for mux-states property in bindings file - appended declaration of variable ret in the end Aswath Govindraju (2): dt-bindings: phy: ti,tcan104x-can: Document mux-states property phy: phy-can-transceiver: Add support for setting mux .../bindings/phy/ti,tcan104x-can.yaml | 10 ++++++++ drivers/phy/Kconfig | 1 + drivers/phy/phy-can-transceiver.c | 24 ++++++++++++++++++- 3 files changed, 34 insertions(+), 1 deletion(-) -- 2.17.1 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/2] dt-bindings: phy: ti,tcan104x-can: Document mux-states property 2021-12-14 14:29 [PATCH v2 0/2] CAN: Add support for setting mux Aswath Govindraju @ 2021-12-14 14:29 ` Aswath Govindraju 2021-12-15 20:40 ` Rob Herring 2021-12-14 14:29 ` [PATCH v2 2/2] phy: phy-can-transceiver: Add support for setting mux Aswath Govindraju 1 sibling, 1 reply; 5+ messages in thread From: Aswath Govindraju @ 2021-12-14 14:29 UTC (permalink / raw) Cc: Aswath Govindraju, Wolfgang Grandegger, Marc Kleine-Budde, Kishon Vijay Abraham I, Vinod Koul, Rob Herring, linux-can, linux-phy, devicetree, linux-kernel On some boards, for routing CAN signals from controller to transceivers, muxes might need to be set. This can be implemented using mux-states property. Therefore, document the same in the respective bindings. Signed-off-by: Aswath Govindraju <a-govindraju@ti.com> --- .../devicetree/bindings/phy/ti,tcan104x-can.yaml | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml index 6107880e5246..7b9216e43b58 100644 --- a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml +++ b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml @@ -37,6 +37,15 @@ properties: max bit rate supported in bps minimum: 1 + mux-states: + description: + mux controller node to route the signals from controller to + transceiver. Two arguments can be present depending on the + mux chip. If one argument is used then it represents the state + to be set on the mux-chip. If there are two arguments then the + first argument is the control line and the second argument is + its corresponding state to be set, on the mux-chip. + required: - compatible - '#phy-cells' @@ -53,4 +62,5 @@ examples: max-bitrate = <5000000>; standby-gpios = <&wakeup_gpio1 16 GPIO_ACTIVE_LOW>; enable-gpios = <&main_gpio1 67 GPIO_ACTIVE_HIGH>; + mux-states = <&mux0 1>; }; -- 2.17.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] dt-bindings: phy: ti,tcan104x-can: Document mux-states property 2021-12-14 14:29 ` [PATCH v2 1/2] dt-bindings: phy: ti,tcan104x-can: Document mux-states property Aswath Govindraju @ 2021-12-15 20:40 ` Rob Herring 2021-12-16 3:59 ` Aswath Govindraju 0 siblings, 1 reply; 5+ messages in thread From: Rob Herring @ 2021-12-15 20:40 UTC (permalink / raw) To: Aswath Govindraju Cc: Wolfgang Grandegger, Marc Kleine-Budde, Kishon Vijay Abraham I, Vinod Koul, linux-can, linux-phy, devicetree, linux-kernel On Tue, Dec 14, 2021 at 07:59:07PM +0530, Aswath Govindraju wrote: > On some boards, for routing CAN signals from controller to transceivers, > muxes might need to be set. This can be implemented using mux-states > property. Therefore, document the same in the respective bindings. > > Signed-off-by: Aswath Govindraju <a-govindraju@ti.com> > --- > .../devicetree/bindings/phy/ti,tcan104x-can.yaml | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml > index 6107880e5246..7b9216e43b58 100644 > --- a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml > +++ b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml > @@ -37,6 +37,15 @@ properties: > max bit rate supported in bps > minimum: 1 > > + mux-states: > + description: > + mux controller node to route the signals from controller to > + transceiver. Two arguments can be present depending on the > + mux chip. If one argument is used then it represents the state > + to be set on the mux-chip. If there are two arguments then the > + first argument is the control line and the second argument is > + its corresponding state to be set, on the mux-chip. > + You are still describing how the mux-states works. What the cells contain and how many are opaque to this binding. Here you need to describe how many muxes you have and what they are controlling as that is what is specific to this binding. If there is only one, this boils down to 'maxItems: 1'. It's just like reg, interrupts, clocks, etc. > required: > - compatible > - '#phy-cells' > @@ -53,4 +62,5 @@ examples: > max-bitrate = <5000000>; > standby-gpios = <&wakeup_gpio1 16 GPIO_ACTIVE_LOW>; > enable-gpios = <&main_gpio1 67 GPIO_ACTIVE_HIGH>; > + mux-states = <&mux0 1>; > }; > -- > 2.17.1 > > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/2] dt-bindings: phy: ti,tcan104x-can: Document mux-states property 2021-12-15 20:40 ` Rob Herring @ 2021-12-16 3:59 ` Aswath Govindraju 0 siblings, 0 replies; 5+ messages in thread From: Aswath Govindraju @ 2021-12-16 3:59 UTC (permalink / raw) To: Rob Herring Cc: Wolfgang Grandegger, Marc Kleine-Budde, Kishon Vijay Abraham I, Vinod Koul, linux-can, linux-phy, devicetree, linux-kernel Hi Rob, On 16/12/21 2:10 am, Rob Herring wrote: > On Tue, Dec 14, 2021 at 07:59:07PM +0530, Aswath Govindraju wrote: >> On some boards, for routing CAN signals from controller to transceivers, >> muxes might need to be set. This can be implemented using mux-states >> property. Therefore, document the same in the respective bindings. >> >> Signed-off-by: Aswath Govindraju <a-govindraju@ti.com> >> --- >> .../devicetree/bindings/phy/ti,tcan104x-can.yaml | 10 ++++++++++ >> 1 file changed, 10 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml >> index 6107880e5246..7b9216e43b58 100644 >> --- a/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml >> +++ b/Documentation/devicetree/bindings/phy/ti,tcan104x-can.yaml >> @@ -37,6 +37,15 @@ properties: >> max bit rate supported in bps >> minimum: 1 >> >> + mux-states: >> + description: >> + mux controller node to route the signals from controller to >> + transceiver. Two arguments can be present depending on the >> + mux chip. If one argument is used then it represents the state >> + to be set on the mux-chip. If there are two arguments then the >> + first argument is the control line and the second argument is >> + its corresponding state to be set, on the mux-chip. >> + > > You are still describing how the mux-states works. What the cells > contain and how many are opaque to this binding. Here you need to > describe how many muxes you have and what they are controlling as that > is what is specific to this binding. If there is only one, this boils > down to 'maxItems: 1'. It's just like reg, interrupts, clocks, etc. > Got it. Thank you for the clarification. Amending the description to the following, mux-states: description: mux controller node to route the signals from controller to transceiver. maxItems: 1 Thanks, Aswath >> required: >> - compatible >> - '#phy-cells' >> @@ -53,4 +62,5 @@ examples: >> max-bitrate = <5000000>; >> standby-gpios = <&wakeup_gpio1 16 GPIO_ACTIVE_LOW>; >> enable-gpios = <&main_gpio1 67 GPIO_ACTIVE_HIGH>; >> + mux-states = <&mux0 1>; >> }; >> -- >> 2.17.1 >> >> ^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 2/2] phy: phy-can-transceiver: Add support for setting mux 2021-12-14 14:29 [PATCH v2 0/2] CAN: Add support for setting mux Aswath Govindraju 2021-12-14 14:29 ` [PATCH v2 1/2] dt-bindings: phy: ti,tcan104x-can: Document mux-states property Aswath Govindraju @ 2021-12-14 14:29 ` Aswath Govindraju 1 sibling, 0 replies; 5+ messages in thread From: Aswath Govindraju @ 2021-12-14 14:29 UTC (permalink / raw) Cc: Aswath Govindraju, Wolfgang Grandegger, Marc Kleine-Budde, Kishon Vijay Abraham I, Vinod Koul, Rob Herring, linux-can, linux-phy, devicetree, linux-kernel 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> --- drivers/phy/Kconfig | 1 + drivers/phy/phy-can-transceiver.c | 24 +++++++++++++++++++++++- 2 files changed, 24 insertions(+), 1 deletion(-) diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 82b63e60c5a2..300b0f2b5f84 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -64,6 +64,7 @@ config USB_LGM_PHY config PHY_CAN_TRANSCEIVER tristate "CAN transceiver PHY" select GENERIC_PHY + select MULTIPLEXER help This option enables support for CAN transceivers as a PHY. This driver provides function for putting the transceivers in various diff --git a/drivers/phy/phy-can-transceiver.c b/drivers/phy/phy-can-transceiver.c index 6f3fe37dee0e..95c6dbb52da7 100644 --- a/drivers/phy/phy-can-transceiver.c +++ b/drivers/phy/phy-can-transceiver.c @@ -10,6 +10,7 @@ #include<linux/module.h> #include<linux/gpio.h> #include<linux/gpio/consumer.h> +#include <linux/mux/consumer.h> struct can_transceiver_data { u32 flags; @@ -21,13 +22,22 @@ struct can_transceiver_phy { struct phy *generic_phy; struct gpio_desc *standby_gpio; struct gpio_desc *enable_gpio; + struct mux_state *mux_state; }; /* Power on function */ static int can_transceiver_phy_power_on(struct phy *phy) { struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); - + int ret; + + if (can_transceiver_phy->mux_state) { + ret = mux_state_select(can_transceiver_phy->mux_state); + if (ret) { + dev_err(&phy->dev, "Failed to select CAN mux: %d\n", ret); + return ret; + } + } if (can_transceiver_phy->standby_gpio) gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0); if (can_transceiver_phy->enable_gpio) @@ -45,6 +55,8 @@ static int can_transceiver_phy_power_off(struct phy *phy) gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1); if (can_transceiver_phy->enable_gpio) gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0); + if (can_transceiver_phy->mux_state) + mux_state_deselect(can_transceiver_phy->mux_state); return 0; } @@ -95,6 +107,16 @@ static int can_transceiver_phy_probe(struct platform_device *pdev) match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node); drvdata = match->data; + if (of_property_read_bool(dev->of_node, "mux-states")) { + struct mux_state *mux_state; + + mux_state = devm_mux_state_get(dev, NULL); + if (IS_ERR(mux_state)) + return dev_err_probe(&pdev->dev, PTR_ERR(mux_state), + "failed to get mux\n"); + can_transceiver_phy->mux_state = mux_state; + } + phy = devm_phy_create(dev, dev->of_node, &can_transceiver_phy_ops); if (IS_ERR(phy)) { -- 2.17.1 ^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-12-16 4:00 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-12-14 14:29 [PATCH v2 0/2] CAN: Add support for setting mux Aswath Govindraju 2021-12-14 14:29 ` [PATCH v2 1/2] dt-bindings: phy: ti,tcan104x-can: Document mux-states property Aswath Govindraju 2021-12-15 20:40 ` Rob Herring 2021-12-16 3:59 ` Aswath Govindraju 2021-12-14 14:29 ` [PATCH v2 2/2] phy: phy-can-transceiver: Add support for setting mux Aswath Govindraju
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