Hi Andy,
On 11/26/2012 02:45 PM, Andy Green wrote:
> This adds regulators which are controlled by the OMAP4 PandaBoard (ES)'s
> EHCI logical root hub existing.
>
> Without power control, the ULPI PHY + SMSC9614 on the Panda eats 700-900mW
> all the time, which is around the same as the idle power of the SoC and
> rest of the board.
>
> This allows us to start off with it depowered, and only power it if the
> ehci-hcd module is inserted. When the module is removed, it's depowered
> again.
>
> Signed-off-by: Andy Green <andy.green@xxxxxxxxxx>
> ---
> arch/arm/mach-omap2/Kconfig | 1
> arch/arm/mach-omap2/board-omap4panda.c | 90 +++++++++++++++++++++++++-------
> 2 files changed, 72 insertions(+), 19 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
> index d669e22..5105109 100644
> --- a/arch/arm/mach-omap2/Kconfig
> +++ b/arch/arm/mach-omap2/Kconfig
> @@ -368,6 +368,7 @@ config MACH_OMAP4_PANDA
> select OMAP_PACKAGE_CBL
> select OMAP_PACKAGE_CBS
> select REGULATOR_FIXED_VOLTAGE if REGULATOR
> + select USB_HUB_DEVICE_PATH_REGULATOR
>
> config OMAP3_EMU
> bool "OMAP3 debugging peripherals"
> diff --git a/arch/arm/mach-omap2/board-omap4panda.c b/arch/arm/mach-omap2/board-omap4panda.c
> index bfcd397..b032b6b 100644
> --- a/arch/arm/mach-omap2/board-omap4panda.c
> +++ b/arch/arm/mach-omap2/board-omap4panda.c
> @@ -154,11 +154,6 @@ static const struct usbhs_omap_board_data usbhs_bdata __initconst = {
> .reset_gpio_port[2] = -EINVAL
> };
>
> -static struct gpio panda_ehci_gpios[] __initdata = {
> - { GPIO_HUB_POWER, GPIOF_OUT_INIT_LOW, "hub_power" },
> - { GPIO_HUB_NRESET, GPIOF_OUT_INIT_LOW, "hub_nreset" },
> -};
> -
> static void __init omap4_ehci_init(void)
> {
> int ret;
> @@ -173,23 +168,76 @@ static void __init omap4_ehci_init(void)
> clk_set_rate(phy_ref_clk, 19200000);
> clk_prepare_enable(phy_ref_clk);
>
> - /* disable the power to the usb hub prior to init and reset phy+hub */
> - ret = gpio_request_array(panda_ehci_gpios,
> - ARRAY_SIZE(panda_ehci_gpios));
> - if (ret) {
> - pr_err("Unable to initialize EHCI power/reset\n");
> - return;
> - }
> + usbhs_init(&usbhs_bdata);
> +}
>
> - gpio_export(GPIO_HUB_POWER, 0);
> - gpio_export(GPIO_HUB_NRESET, 0);
> - gpio_set_value(GPIO_HUB_NRESET, 1);
> +/*
> + * hub_nreset also resets the ULPI PHY and is required after powering SMSC chip
> + * ULPI PHY is always powered... need to do reset once for both once
> + * hub_power enables a 3.3V regulator for (hub + eth) chip
> + * however there's no point having ULPI PHY in use alone
> + * since it's only connected to the (hub + eth) chip
> + */
>
> - usbhs_init(&usbhs_bdata);
> +static struct regulator_init_data panda_hub = {
> + .constraints = {
> + .name = "vhub",
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> +};
>
> - /* enable power to hub */
> - gpio_set_value(GPIO_HUB_POWER, 1);
> -}
> +static struct fixed_voltage_config panda_vhub = {
> + .supply_name = "vhub",
> + .microvolts = 3300000,
> + .gpio = GPIO_HUB_POWER,
> + .startup_delay = 70000, /* 70msec */
> + .enable_high = 1,
> + .enabled_at_boot = 0,
> + .init_data = &panda_hub,
> +};
> +
> +static struct platform_device omap_vhub_device = {
> + .name = "reg-fixed-voltage",
> + .id = 2,
> + .dev = {
> + .platform_data = &panda_vhub,
> + },
> +};
> +
> +static struct regulator_init_data panda_ulpireset = {
> + /*
> + * idea is that when operating ulpireset, regulator api will make
> + * sure that the hub+eth chip is powered, since it's the "parent"
> + */
> + .supply_regulator = "vhub", /* we are a child of vhub */
> + .constraints = {
> + /*
> + * this magic string associates us with ehci-omap.0 root hub
> + * when the root hub logical device is up, we will power
> + * and reset [ ULPI PHY + [ HUB + ETH ] ]
> + */
> + .name = "/platform/usbhs_omap/ehci-omap.0/usb*",
> + .valid_ops_mask = REGULATOR_CHANGE_STATUS,
> + },
> +};
> +
> +static struct fixed_voltage_config panda_vulpireset = {
> + .supply_name = "/platform/usbhs_omap/ehci-omap.0/usb*",
Does this supply_name really needs to be the magic string?
> + .microvolts = 3300000,
> + .gpio = GPIO_HUB_NRESET,
> + .startup_delay = 70000, /* 70msec */
> + .enable_high = 1,
> + .enabled_at_boot = 0,
> + .init_data = &panda_ulpireset,
> +};
> +
> +static struct platform_device omap_vulpireset_device = {
> + .name = "reg-fixed-voltage",
> + .id = 3,
> + .dev = {
> + .platform_data = &panda_vulpireset,
> + },
> +};
>
> static struct omap_musb_board_data musb_board_data = {
> .interface_type = MUSB_INTERFACE_UTMI,
> @@ -503,7 +551,11 @@ static void __init omap4_panda_init(void)
> omap4_panda_init_rev();
> omap4_panda_i2c_init();
> platform_add_devices(panda_devices, ARRAY_SIZE(panda_devices));
> + /* let device_path api know anything matching this reports as this */
> + device_path_register_wildcard_path(panda_ulpireset.constraints.name);
> platform_device_register(&omap_vwlan_device);
> + platform_device_register(&omap_vhub_device);
> + platform_device_register(&omap_vulpireset_device);
> omap_serial_init();
> omap_sdrc_init(NULL, NULL);
> omap4_twl6030_hsmmc_init(mmc);
>
--
cheers,
-roger
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