[U-Boot] [PATCH v5 4/6] mvebu: usb: xhci: Add VBUS regulator supply to the host driver

[Konstantin Porotchkin]

On 02/09/2017 03:37 PM, Marek Vasut wrote:
> On 02/09/2017 12:32 PM, kostap at marvell.com wrote:
>> From: Konstantin Porotchkin <kostap at marvell.com>
>>
>> The USB device should linked to VBUS regulator through "vbus-supply"
>> DTS property.
>> This patch adds handling for "vbus-supply" property inside the USB
>> device entry for turning on the VBUS regulator upon the host adapter probe.
>>
>> Signed-off-by: Konstantin Porotchkin <kostap at marvell.com>
>> Cc: Stefan Roese <sr at denx.de>
>> Cc: Marek Vasut <marex at denx.de>
>> Cc: Nadav Haklai <nadavh at marvell.com>
>> Cc: Neta Zur Hershkovits <neta at marvell.com>
>> Cc: Igal Liberman <igall at marvell.com>
>> Cc: Haim Boot <hayim at marvell.com>
>> ---
>> Changes for v5:
>> - Extended clocks description in documentation
>> - Removed print for regulator not found case
>>
>>  doc/device-tree-bindings/usb/marvell.xhci-usb.txt | 29 +++++++++++++++++++++++
>>  drivers/usb/host/Kconfig                          |  1 +
>>  drivers/usb/host/xhci-mvebu.c                     | 13 +++++++++-
>>  3 files changed, 42 insertions(+), 1 deletion(-)
>>  create mode 100644 doc/device-tree-bindings/usb/marvell.xhci-usb.txt
>>
>> diff --git a/doc/device-tree-bindings/usb/marvell.xhci-usb.txt b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
>> new file mode 100644
>> index 0000000..6cc370c
>> --- /dev/null
>> +++ b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
>> @@ -0,0 +1,29 @@
>> +Marvell SOC USB controllers
>> +
>> +This controller is integrated in Armada 3700/8K.
>> +It uses the same properties as a generic XHCI host controller
>> +
>> +Required properties :
>> + - compatible: should be one or more of:
>> +   - "marvell,armada3700-xhci", "generic-xhci" for Armada 37xx SoCs
>> +   - "marvell,armada-8k-xhci", "generic-xhci" for Armada A8K SoCs
>> + - reg: should contain address and length of the standard XHCI
>> +   register set for the device.
>> + - interrupts: one XHCI interrupt should be described here.
>> +
>> +Optional properties:
>> + - clocks: reference to a platform clocks that should be enabled/configured
>> +   upon interface initialization. May not exist on all platforms.
>
> This is probably block clock then ?
>
> Otherwise,
> Acked-by: Marek Vasut <marex at denx.de>
Otherwise the the internal SoC clock does not require gating/muxing or 
any other configuration for making this USB host adapter running.
Not sure if I understood your question well.
>
>> + - vbus-supply : If present, specifies the fixed regulator to be turned on
>> +   for providing power to the USB VBUS rail.
>> +
>> +Example:
>> +	cpm_usb3_0: usb3 at 500000 {
>> +		compatible = "marvell,armada-8k-xhci",
>> +			     "generic-xhci";
>> +		reg = <0x500000 0x4000>;
>> +		interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
>> +		clocks = <&cpm_syscon0 1 22>;
>> +		vbus-supply = <&reg_usb3h0_vbus>;
>> +		status = "disabled";
>> +	};
>> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
>> index 5129a57..0bf8274 100644
>> --- a/drivers/usb/host/Kconfig
>> +++ b/drivers/usb/host/Kconfig
>> @@ -25,6 +25,7 @@ config USB_XHCI_MVEBU
>>  	bool "MVEBU USB 3.0 support"
>>  	default y
>>  	depends on ARCH_MVEBU
>> +	select DM_REGULATOR
>>  	help
>>  	  Choose this option to add support for USB 3.0 driver on mvebu
>>  	  SoCs, which includes Armada8K, Armada3700 and other Armada
>> diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c
>> index 46eb937..d880af1 100644
>> --- a/drivers/usb/host/xhci-mvebu.c
>> +++ b/drivers/usb/host/xhci-mvebu.c
>> @@ -10,6 +10,7 @@
>>  #include <dm.h>
>>  #include <fdtdec.h>
>>  #include <usb.h>
>> +#include <power/regulator.h>
>>  #include <asm/gpio.h>
>>
>>  #include "xhci.h"
>> @@ -44,12 +45,22 @@ static int xhci_usb_probe(struct udevice *dev)
>>  	struct mvebu_xhci_platdata *plat = dev_get_platdata(dev);
>>  	struct mvebu_xhci *ctx = dev_get_priv(dev);
>>  	struct xhci_hcor *hcor;
>> -	int len;
>> +	int len, ret;
>> +	struct udevice *regulator;
>>
>>  	ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
>>  	len = HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase));
>>  	hcor = (struct xhci_hcor *)((uintptr_t)ctx->hcd + len);
>>
>> +	ret = device_get_supply_regulator(dev, "vbus-supply", &regulator);
>> +	if (!ret) {
>> +		ret = regulator_set_enable(regulator, true);
>> +		if (ret) {
>> +			printf("Failed to turn ON the VBUS regulator\n");
>> +			return ret;
>> +		}
>> +	}
>> +
>>  	/* Enable USB xHCI (VBUS, reset etc) in board specific code */
>>  	board_xhci_enable();
>>
>>
>
>