Re: [PATCH 02/17] phy: ti-pipe3: use *syscon* framework to power on/off the PHY
From: Kishon Vijay Abraham I
Date: Wed Jun 24 2015 - 07:27:38 EST
Hi,
On Tuesday 23 June 2015 08:23 PM, Roger Quadros wrote:
Hi Kishon,
On Tue, 23 Jun 2015 17:28:47 +0530
Kishon Vijay Abraham I <kishon@xxxxxx> wrote:
Deprecate using phy-omap-control driver to power on/off the PHY and
use *syscon* framework to do the same.
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
---
Documentation/devicetree/bindings/phy/ti-phy.txt | 10 ++-
drivers/phy/phy-ti-pipe3.c | 91 ++++++++++++++++++----
2 files changed, 86 insertions(+), 15 deletions(-)
diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt b/Documentation/devicetree/bindings/phy/ti-phy.txt
index f0f5537..d3ad3bf 100644
--- a/Documentation/devicetree/bindings/phy/ti-phy.txt
+++ b/Documentation/devicetree/bindings/phy/ti-phy.txt
@@ -77,8 +77,6 @@ Required properties:
* "div-clk" - apll clock
Optional properties:
- - ctrl-module : phandle of the control module used by PHY driver to power on
- the PHY.
- id: If there are multiple instance of the same type, in order to
differentiate between each instance "id" can be used (e.g., multi-lane PCIe
PHY). If "id" is not provided, it is set to default value of '1'.
@@ -86,6 +84,14 @@ Optional properties:
CTRL_CORE_SMA_SW_0 register and register offset to the CTRL_CORE_SMA_SW_0
register that contains the SATA_PLL_SOFT_RESET bit. Only valid for sata_phy.
+Deprecated properties:
+ - ctrl-module : phandle of the control module used by PHY driver to power on
+ the PHY.
+
+Recommended properies:
+ - syscon-phy-power : phandle/offset pair. Phandle to the system control
+ module and the register offset to power on/off the PHY.
+
This is usually a subnode of ocp2scp to which it is connected.
usb3phy@4a084400 {
diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index d784426..78bac00 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -56,6 +56,15 @@
#define SATA_PLL_SOFT_RESET BIT(18)
+#define PIPE3_PHY_PWRCTL_CLK_CMD_MASK 0x003FC000
+#define PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT 14
+
+#define PIPE3_PHY_PWRCTL_CLK_FREQ_MASK 0xFFC00000
+#define PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT 22
+
+#define PIPE3_PHY_TX_RX_POWERON 0x3
+#define PIPE3_PHY_TX_RX_POWEROFF 0x0
+
/*
* This is an Empirical value that works, need to confirm the actual
* value required for the PIPE3PHY_PLL_CONFIGURATION2.PLL_IDLE status
@@ -86,8 +95,10 @@ struct ti_pipe3 {
struct clk *refclk;
struct clk *div_clk;
struct pipe3_dpll_map *dpll_map;
+ struct regmap *phy_power_syscon; /* ctrl. reg. acces */
struct regmap *dpll_reset_syscon; /* ctrl. reg. acces */
unsigned int dpll_reset_reg; /* reg. index within syscon */
+ unsigned int power_reg; /* power reg. index within syscon */
bool sata_refclk_enabled;
};
@@ -144,18 +155,49 @@ static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy);
static int ti_pipe3_power_off(struct phy *x)
{
+ u32 val;
+ int ret;
struct ti_pipe3 *phy = phy_get_drvdata(x);
- omap_control_phy_power(phy->control_dev, 0);
+ if (phy->phy_power_syscon) {
+ val = PIPE3_PHY_TX_RX_POWEROFF <<
+ PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+
+ ret = regmap_update_bits(phy->phy_power_syscon, phy->power_reg,
+ PIPE3_PHY_PWRCTL_CLK_CMD_MASK, val);
+ if (ret < 0)
+ return ret;
+ } else {
+ omap_control_phy_power(phy->control_dev, 0);
+ }
return 0;
}
static int ti_pipe3_power_on(struct phy *x)
{
+ u32 val;
+ u32 mask;
+ int ret;
+ unsigned long rate;
struct ti_pipe3 *phy = phy_get_drvdata(x);
- omap_control_phy_power(phy->control_dev, 1);
+ if (phy->phy_power_syscon) {
+ rate = clk_get_rate(phy->sys_clk);
what if clk_get_rate() returns 0?
hmm.. If '0' is an error value of clk_get_rate() then it would be good to
return with an error message.
+ rate = rate / 1000000;
+ mask = OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_CMD_MASK |
+ OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_MASK;
+ val = PIPE3_PHY_TX_RX_POWERON <<
+ PIPE3_PHY_PWRCTL_CLK_CMD_SHIFT;
+ val |= rate << OMAP_CTRL_PIPE3_PHY_PWRCTL_CLK_FREQ_SHIFT;
+
+ ret = regmap_update_bits(phy->phy_power_syscon, phy->power_reg,
+ mask, val);
+ if (ret < 0)
+ return ret;
+ } else {
+ omap_control_phy_power(phy->control_dev, 1);
+ }
return 0;
}
@@ -417,19 +459,42 @@ static int ti_pipe3_probe(struct platform_device *pdev)
phy->div_clk = ERR_PTR(-ENODEV);
}
- control_node = of_parse_phandle(node, "ctrl-module", 0);
- if (!control_node) {
- dev_err(&pdev->dev, "Failed to get control device phandle\n");
- return -EINVAL;
- }
+ phy->phy_power_syscon = syscon_regmap_lookup_by_phandle(node,
+ "syscon-phy-power");
+ if (IS_ERR(phy->phy_power_syscon)) {
+ dev_info(&pdev->dev,
+ "can't get syscon-phy-power, using control device\n");
dev_dbg()? as we don't want to annoy old DT users?
okay.
+ phy->phy_power_syscon = NULL;
+
+ control_node = of_parse_phandle(node, "ctrl-module", 0);
+ if (!control_node) {
+ dev_err(&pdev->dev,
+ "Failed to get control device phandle\n");
+ return -EINVAL;
+ }
- control_pdev = of_find_device_by_node(control_node);
- if (!control_pdev) {
- dev_err(&pdev->dev, "Failed to get control device\n");
- return -EINVAL;
- }
+ control_pdev = of_find_device_by_node(control_node);
+ if (!control_pdev) {
+ dev_err(&pdev->dev, "Failed to get control device\n");
+ return -EINVAL;
+ }
- phy->control_dev = &control_pdev->dev;
+ phy->control_dev = &control_pdev->dev;
+ } else {
+ phy->sys_clk = devm_clk_get(phy->dev, "sysclk");
+ if (IS_ERR(phy->sys_clk)) {
+ dev_err(&pdev->dev, "unable to get sysclk\n");
+ return -EINVAL;
+ }
we're already doing this at another place in pipe3_probe. Let's do it at one place.
right, this can be improved.
Thanks
Kishon
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