[PATCH v2 6/7] amba: Allow pclk to be controlled by power domain

[Bjorn Andersson]

On the Qualcomm SDM845 platform the apb_pclk is controlled as part of
the QDSS power/clock domain. Handle this by allowing amba to operate
without direct apb_pclk control, when a powerdomain is attached and no
clock is described.

Signed-off-by: Bjorn Andersson <bjorn.anders...@linaro.org>
---

Changes since v1:
- New patch

 drivers/amba/bus.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 41b706403ef7..3e13050c6d59 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -219,8 +219,13 @@ static int amba_get_enable_pclk(struct amba_device *pcdev)
        int ret;
 
        pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk");
-       if (IS_ERR(pcdev->pclk))
-               return PTR_ERR(pcdev->pclk);
+       if (IS_ERR(pcdev->pclk)) {
+               /* Continue with no clock specified, but pm_domain attached */
+               if (PTR_ERR(pcdev->pclk) == -ENOENT && pcdev->dev.pm_domain)
+                       pcdev->pclk = NULL;
+               else
+                       return PTR_ERR(pcdev->pclk);
+       }
 
        ret = clk_prepare_enable(pcdev->pclk);
        if (ret)
-- 
2.18.0