mfd: twl6040: Handle mclk used for HPPLL and optional internal clock source
authorPeter Ujfalusi <peter.ujfalusi@ti.com>
Mon, 20 Jun 2016 14:07:18 +0000 (17:07 +0300)
committerLee Jones <lee.jones@linaro.org>
Wed, 29 Jun 2016 09:16:43 +0000 (10:16 +0100)
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>
Documentation/devicetree/bindings/mfd/twl6040.txt
drivers/mfd/twl6040.c
include/linux/mfd/twl6040.h

index a41157b5d930d2c0ed1dfaee5fd9c0aa9d392d1e..e6afdfa3543d4ef9a882a626bb882c08e5e5dc82 100644 (file)
@@ -19,8 +19,8 @@ Required properties:
 
 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:
index 852d5874aabb764ae7948d9cbfd4abf5123d413c..ab328ec49353209bfbb5c0e1a741f25b5efac829 100644 (file)
@@ -323,8 +323,7 @@ int twl6040_power(struct twl6040 *twl6040, int on)
 
                /* 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 @@ int twl6040_power(struct twl6040 *twl6040, int on)
                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 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
 
        /* 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 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
                        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 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
                        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 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
                                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 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
                        lppllctl &= ~TWL6040_LPLLENA;
                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
                                          lppllctl);
+
+                       twl6040->mclk_rate = freq_in;
                }
                break;
        default:
@@ -491,8 +501,7 @@ int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
                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 @@ EXPORT_SYMBOL(twl6040_get_pll);
 
 unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
 {
-       return twl6040->sysclk;
+       return twl6040->sysclk_rate;
 }
 EXPORT_SYMBOL(twl6040_get_sysclk);
 
@@ -655,10 +664,18 @@ static int twl6040_probe(struct i2c_client *client,
        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,
index 8e95cd87cd749fd5426a01db5e313416b30dac37..36795a1be47956b645917deed8d75b1ed089c5ea 100644 (file)
@@ -226,6 +226,7 @@ struct twl6040 {
        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 @@ struct twl6040 {
 
        /* 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;
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