mirror of https://github.com/hak5/openwrt-owl.git
95 lines
2.7 KiB
Diff
95 lines
2.7 KiB
Diff
|
From 3526403353c2a1b94c3181f900582626d23c339b Mon Sep 17 00:00:00 2001
|
||
|
|
From: Linus Walleij <linus.walleij@linaro.org>
|
||
|
|
Date: Thu, 18 Aug 2016 20:40:45 +0200
|
||
|
|
Subject: mfd: qcom_rpm: Handle message RAM clock
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=UTF-8
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
|
||
|
|
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.andersson@linaro.org>
|
||
|
|
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
|
||
|
|
Signed-off-by: Lee Jones <lee.jones@linaro.org>
|
||
|
|
---
|
||
|
|
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 d330071..52fafea 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;
|
||
|
|
@@ -552,6 +554,20 @@ 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");
|
||
|
|
@@ -672,7 +688,11 @@ 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
--
|
||
|
|
cgit v0.12
|