Re: [U-Boot] [PATCH] phy: add a NO-OP phy driver

On 07/21/2017 10:49 AM, Jean-Jacques Hiblot wrote:

The no-op phy driver is useful when a driver uses the phy framework but no PHY driver is available for the hardware (or the hardware has no PHY).

Signed-off-by: Jean-Jacques Hiblot jjhiblot@ti.com

Following the email thread '[PATCH 1/1] dm: phy: add missing #ifdef CONFIG_PHY', here is a patch to add support for a no-op phy.

Jean-Jacques

Documentation/devicetree/bindings/phy/no-op.txt | 16 +++++++++++++++ drivers/phy/Kconfig | 18 +++++++++++++++++ drivers/phy/Makefile | 1 + drivers/phy/noop-phy.c | 26 +++++++++++++++++++++++++ 4 files changed, 61 insertions(+) create mode 100644 Documentation/devicetree/bindings/phy/no-op.txt create mode 100644 drivers/phy/noop-phy.c

diff --git a/Documentation/devicetree/bindings/phy/no-op.txt b/Documentation/devicetree/bindings/phy/no-op.txt new file mode 100644 index 0000000..eb1a562 --- /dev/null +++ b/Documentation/devicetree/bindings/phy/no-op.txt @@ -0,0 +1,16 @@ +NO-OP Phy driver

+The driver is used to stub PHY opeartions in a driver (USB, SATA).

operations

+This is useful when the PHY driver for a particular hardware doesn't exist yet +(the hardware is initialized by the platform code).

+Required properties: +- compatible : must contain "noop-phy" +- #phy-cells : must contain <0>

+Example:

+noop_phy {

• compatible = "noop-phy";
• #phy-cells = <0>;

+}; diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 7841554..68dced7 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -41,6 +41,24 @@ config PHY_SANDBOX This select a dummy sandbox PHY driver. It used only to implement the unit tests for the phy framework

+config NOOP_PHY

• bool "no-op phy"

Please fix the option description, this is quite sloppy.

• depends on PHY
• help

•  Support for a no-op PHY
  

•  This is useful when a driver uses the PHY framework but no driver
  

•  has yet been written for the PHY (or if there is no hardware PHY).
  

This really is only useful if there is no dedicated PHY.

+config SPL_NOOP_PHY

• bool "no-op phy in SPL"

DTTO

• depends on SPL_PHY
• help

•  Support for a no-op PHY in SPL
  

•  This is useful when a driver uses the PHY framework but no driver
  

•  has yet been written for the PHY (or if there is no hardware PHY).
  

config PIPE3_PHY bool "Support omap's PIPE3 PHY" depends on PHY && ARCH_OMAP2PLUS diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 6ce96d2..f129b5c 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -6,5 +6,6 @@ #

obj-$(CONFIG_$(SPL_)PHY) += phy-uclass.o +obj-$(CONFIG_$(SPL_)NOOP_PHY) += noop-phy.o obj-$(CONFIG_PHY_SANDBOX) += sandbox-phy.o obj-$(CONFIG_$(SPL_)PIPE3_PHY) += ti-pipe3-phy.o diff --git a/drivers/phy/noop-phy.c b/drivers/phy/noop-phy.c new file mode 100644 index 0000000..14ccf86 --- /dev/null +++ b/drivers/phy/noop-phy.c @@ -0,0 +1,26 @@ +/*

• • Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
• • Written by Jean-Jacques Hiblot jjhiblot@ti.com
• • SPDX-License-Identifier: GPL-2.0+
• */

+#include <common.h> +#include <dm.h> +#include <dm/device.h> +#include <generic-phy.h>

+static const struct udevice_id noop_phy_ids[] = {

• { .compatible = "noop-phy" },
• { }

+};

+static struct phy_ops noop_phy_ops = { +};

+U_BOOT_DRIVER(noop_phy) = {

• .name = "noop_phy",
• .id = UCLASS_PHY,
• .of_match = noop_phy_ids,
• .ops = &noop_phy_ops,

+};