[PATCH v2] mfd: qcom_rpm: handle message RAM clock

[Linus Walleij]

The MSM8660, APQ8060, IPQ806x and MSM8960 have a GCC clock
to the message RAM used by the RPM. This needs to be enabled
for messages to pass through. This is a crude solution that
simply prepare/enable at probe() and disable/unprepare
at remove(). More elaborate PM is probably possible to
add later.

The construction uses IS_ERR() to gracefully handle the
platforms that do not provide a message RAM clock. It will
bail out of probe only if the clock is hitting a probe
deferral situation.

Of course this requires the proper device tree set-up:

rpm: rpm@104000 {
    compatible = "qcom,rpm-msm8660";
    clocks = <&gcc RPM_MSG_RAM_H_CLK>;
    clock-names = "ram";
    ...
};

I have provided this in the MSM8660 device tree, and will
provide patches for the other targets.

Cc: Björn Andersson <bjorn.anders...@linaro.org>
Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
---
ChangeLog v1->v2:
- Exploit that a clk can be NULL and handled transparently
  by the clock framework, simplifying the code
- Move clock disablement after the OF depopulation call
---
 drivers/mfd/qcom_rpm.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/mfd/qcom_rpm.c b/drivers/mfd/qcom_rpm.c
index 2e44323455dd..315da71bde49 100644
--- a/drivers/mfd/qcom_rpm.c
+++ b/drivers/mfd/qcom_rpm.c
@@ -21,6 +21,7 @@
 #include <linux/mfd/qcom_rpm.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/clk.h>
 
 #include <dt-bindings/mfd/qcom-rpm.h>
 
@@ -48,6 +49,7 @@ struct qcom_rpm {
        struct regmap *ipc_regmap;
        unsigned ipc_offset;
        unsigned ipc_bit;
+       struct clk *ramclk;
 
        struct completion ack;
        struct mutex lock;
@@ -501,6 +503,20 @@ static int qcom_rpm_probe(struct platform_device *pdev)
        mutex_init(&rpm->lock);
        init_completion(&rpm->ack);
 
+       /* Enable message RAM clock */
+       rpm->ramclk = devm_clk_get(&pdev->dev, "ram");
+       if (IS_ERR(rpm->ramclk)) {
+               ret = PTR_ERR(rpm->ramclk);
+               if (ret == -EPROBE_DEFER)
+                       return ret;
+               /*
+                * Fall through in all other cases, as the clock is
+                * optional. (Does not exist on all platforms.)
+                */
+               rpm->ramclk = NULL;
+       }
+       clk_prepare_enable(rpm->ramclk); /* Accepts NULL */
+
        irq_ack = platform_get_irq_byname(pdev, "ack");
        if (irq_ack < 0) {
                dev_err(&pdev->dev, "required ack interrupt missing\n");
@@ -620,7 +636,11 @@ static int qcom_rpm_probe(struct platform_device *pdev)
 
 static int qcom_rpm_remove(struct platform_device *pdev)
 {
+       struct qcom_rpm *rpm = dev_get_drvdata(&pdev->dev);
+
        of_platform_depopulate(&pdev->dev);
+       clk_disable_unprepare(rpm->ramclk);
+
        return 0;
 }
 
-- 
2.7.4