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phy: phy-stih407-usb: Pass sysconfig register offsets via syscfg property.

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Based on Arnds review comments here https://lkml.org/lkml/2014/11/13/161,
update the phy driver to not use the reg property to access the sysconfig
register offsets.

This is because other phy's (miphy28, miphy365) have a combination of
memory mapped registers and sysconfig control regs, and we shouldn't
be mixing address spaces in the reg property. In addition we would
ideally like the sysconfig offsets to be passed via DT in a uniform way.

This new method will also allow us to support devices which have sysconfig
registers in different banks more easily and it is also analagous to how
keystone and bcm7745 platforms pass there syscon offsets in DT.

This breaks DT compatibility, but this platform is considered WIP, and
is only used by a few developers who are upstreaming support for it.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Peter Griffin 2015-01-16 16:04:11 +01:00 committed by Kishon Vijay Abraham I
parent de6e0f84be
commit 5402d927ae
2 changed files with 16 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/devicetree/bindings/phy/phy-stih407-usb.txt
View File

@ -5,10 +5,7 @@ host controllers (when controlling usb2/1.1 devices) available on STiH407 SoC fa
Required properties:
- compatible : should be "st,stih407-usb2-phy"
- reg : contain the offset and length of the system configuration registers
used as glue logic to control & parameter phy
- reg-names : the names of the system configuration registers in "reg", should be "param" and "reg"
- st,syscfg : sysconfig register to manage phy parameter at driver level
- st,syscfg : phandle of sysconfig bank plus integer array containing phyparam and phyctrl register offsets
- resets : list of phandle and reset specifier pairs. There should be two entries, one
for the whole phy and one for the port
- reset-names : list of reset signal names. Should be "global" and "port"
@ -19,11 +16,8 @@ Example:
usb2_picophy0: usbpicophy@f8 {
compatible = "st,stih407-usb2-phy";
reg = <0xf8 0x04>, /* syscfg 5062 */
<0xf4 0x04>; /* syscfg 5061 */
reg-names = "param", "ctrl";
#phy-cells = <0>;
st,syscfg = <&syscfg_core>;
st,syscfg = <&syscfg_core 0x100 0xf4>;
resets = <&softreset STIH407_PICOPHY_SOFTRESET>,
<&picophyreset STIH407_PICOPHY0_RESET>;
reset-names = "global", "port";

25
drivers/phy/phy-stih407-usb.c
View File

@ -22,6 +22,9 @@
#include <linux/mfd/syscon.h>
#include <linux/phy/phy.h>
#define PHYPARAM_REG 1
#define PHYCTRL_REG 2
/* Default PHY_SEL and REFCLKSEL configuration */
#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6
#define STIH407_USB_PICOPHY_CTRL_PORT_MASK 0x1f
@ -93,7 +96,7 @@ static int stih407_usb2_picophy_probe(struct platform_device *pdev)
struct device_node *np = dev->of_node;
struct phy_provider *phy_provider;
struct phy *phy;
struct resource *res;
int ret;
phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
if (!phy_dev)
@ -123,19 +126,19 @@ static int stih407_usb2_picophy_probe(struct platform_device *pdev)
return PTR_ERR(phy_dev->regmap);
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl");
if (!res) {
dev_err(dev, "No ctrl reg found\n");
return -ENXIO;
ret = of_property_read_u32_index(np, "st,syscfg", PHYPARAM_REG,
&phy_dev->param);
if (ret) {
dev_err(dev, "can't get phyparam offset (%d)\n", ret);
return ret;
}
phy_dev->ctrl = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "param");
if (!res) {
dev_err(dev, "No param reg found\n");
return -ENXIO;
ret = of_property_read_u32_index(np, "st,syscfg", PHYCTRL_REG,
&phy_dev->ctrl);
if (ret) {
dev_err(dev, "can't get phyctrl offset (%d)\n", ret);
return ret;
}
phy_dev->param = res->start;
phy = devm_phy_create(dev, NULL, &stih407_usb2_picophy_data);
if (IS_ERR(phy)) {