mfd: twl6040: Handle mclk used for HPPLL and optional internal clock source
On some boards, like omap5-uevm the MCLK is gated by default and in order
to be able to use the High performance modes of twl6040 it need to be
enabled by SW.
Add support for handling the MCLK source clock via CCF.
At the same time lower the print priority of the notification that the 32K
clock is not provided and it is not going to be handled by the driver.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/Documentation/devicetree/bindings/mfd/twl6040.txt b/Documentation/devicetree/bindings/mfd/twl6040.txt
index a41157b..e6afdfa3 100644
--- a/Documentation/devicetree/bindings/mfd/twl6040.txt
+++ b/Documentation/devicetree/bindings/mfd/twl6040.txt
@@ -19,8 +19,8 @@
Optional properties, nodes:
- enable-active-high: To power on the twl6040 during boot.
-- clocks: phandle to the clk32k clock provider
-- clock-names: Must be "clk32k"
+- clocks: phandle to the clk32k and/or to mclk clock provider
+- clock-names: Must be "clk32k" for the 32K clock and "mclk" for the MCLK.
Vibra functionality
Required properties:
diff --git a/drivers/mfd/twl6040.c b/drivers/mfd/twl6040.c
index 852d587..ab328ec 100644
--- a/drivers/mfd/twl6040.c
+++ b/drivers/mfd/twl6040.c
@@ -323,8 +323,7 @@
/* Default PLL configuration after power up */
twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
- twl6040->sysclk = 19200000;
- twl6040->mclk = 32768;
+ twl6040->sysclk_rate = 19200000;
} else {
/* already powered-down */
if (!twl6040->power_count) {
@@ -352,8 +351,12 @@
regcache_cache_only(twl6040->regmap, true);
regcache_mark_dirty(twl6040->regmap);
- twl6040->sysclk = 0;
- twl6040->mclk = 0;
+ twl6040->sysclk_rate = 0;
+
+ if (twl6040->pll == TWL6040_SYSCLK_SEL_HPPLL) {
+ clk_disable_unprepare(twl6040->mclk);
+ twl6040->mclk_rate = 0;
+ }
clk_disable_unprepare(twl6040->clk32k);
}
@@ -377,15 +380,15 @@
/* Force full reconfiguration when switching between PLL */
if (pll_id != twl6040->pll) {
- twl6040->sysclk = 0;
- twl6040->mclk = 0;
+ twl6040->sysclk_rate = 0;
+ twl6040->mclk_rate = 0;
}
switch (pll_id) {
case TWL6040_SYSCLK_SEL_LPPLL:
/* low-power PLL divider */
/* Change the sysclk configuration only if it has been canged */
- if (twl6040->sysclk != freq_out) {
+ if (twl6040->sysclk_rate != freq_out) {
switch (freq_out) {
case 17640000:
lppllctl |= TWL6040_LPLLFIN;
@@ -427,6 +430,8 @@
ret = -EINVAL;
goto pll_out;
}
+
+ clk_disable_unprepare(twl6040->mclk);
break;
case TWL6040_SYSCLK_SEL_HPPLL:
/* high-performance PLL can provide only 19.2 MHz */
@@ -437,7 +442,7 @@
goto pll_out;
}
- if (twl6040->mclk != freq_in) {
+ if (twl6040->mclk_rate != freq_in) {
hppllctl &= ~TWL6040_MCLK_MSK;
switch (freq_in) {
@@ -468,6 +473,9 @@
goto pll_out;
}
+ /* When switching to HPPLL, enable the mclk first */
+ if (pll_id != twl6040->pll)
+ clk_prepare_enable(twl6040->mclk);
/*
* enable clock slicer to ensure input waveform is
* square
@@ -483,6 +491,8 @@
lppllctl &= ~TWL6040_LPLLENA;
twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
lppllctl);
+
+ twl6040->mclk_rate = freq_in;
}
break;
default:
@@ -491,8 +501,7 @@
goto pll_out;
}
- twl6040->sysclk = freq_out;
- twl6040->mclk = freq_in;
+ twl6040->sysclk_rate = freq_out;
twl6040->pll = pll_id;
pll_out:
@@ -512,7 +521,7 @@
unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
{
- return twl6040->sysclk;
+ return twl6040->sysclk_rate;
}
EXPORT_SYMBOL(twl6040_get_sysclk);
@@ -655,10 +664,18 @@
if (IS_ERR(twl6040->clk32k)) {
if (PTR_ERR(twl6040->clk32k) == -EPROBE_DEFER)
return -EPROBE_DEFER;
- dev_info(&client->dev, "clk32k is not handled\n");
+ dev_dbg(&client->dev, "clk32k is not handled\n");
twl6040->clk32k = NULL;
}
+ twl6040->mclk = devm_clk_get(&client->dev, "mclk");
+ if (IS_ERR(twl6040->mclk)) {
+ if (PTR_ERR(twl6040->mclk) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ dev_dbg(&client->dev, "mclk is not handled\n");
+ twl6040->mclk = NULL;
+ }
+
twl6040->supplies[0].supply = "vio";
twl6040->supplies[1].supply = "v2v1";
ret = devm_regulator_bulk_get(&client->dev, TWL6040_NUM_SUPPLIES,
diff --git a/include/linux/mfd/twl6040.h b/include/linux/mfd/twl6040.h
index 8e95cd8..36795a1 100644
--- a/include/linux/mfd/twl6040.h
+++ b/include/linux/mfd/twl6040.h
@@ -226,6 +226,7 @@
struct regmap_irq_chip_data *irq_data;
struct regulator_bulk_data supplies[2]; /* supplies for vio, v2v1 */
struct clk *clk32k;
+ struct clk *mclk;
struct mutex mutex;
struct mutex irq_mutex;
struct mfd_cell cells[TWL6040_CELLS];
@@ -237,8 +238,8 @@
/* PLL configuration */
int pll;
- unsigned int sysclk;
- unsigned int mclk;
+ unsigned int sysclk_rate;
+ unsigned int mclk_rate;
unsigned int irq;
unsigned int irq_ready;
