Hi Matthias,

On 3/14/2020 6:28 AM, Matthias Kaehlcke wrote:

Hi,

On Fri, Mar 13, 2020 at 06:42:13PM +0530, Akash Asthana wrote:

quoted

Get the interconnect paths for QSPI device and vote according to the
current bus speed of the driver.

Signed-off-by: Akash Asthana <redacted>
---
  - As per Bjorn's comment, introduced and using devm_of_icc_get API for getting
    path handle
  - As per Matthias comment, added error handling for icc_set_bw call

  drivers/spi/spi-qcom-qspi.c | 46 ++++++++++++++++++++++++++++++++++++++++++++-
  1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
index 3c4f83b..ad48f43 100644
--- a/drivers/spi/spi-qcom-qspi.c
+++ b/drivers/spi/spi-qcom-qspi.c

@@ -2,6 +2,7 @@
  // Copyright (c) 2017-2018, The Linux foundation. All rights reserved.
  
  #include <linux/clk.h>
+#include <linux/interconnect.h>
  #include <linux/interrupt.h>
  #include <linux/io.h>
  #include <linux/module.h>

@@ -139,7 +140,10 @@ struct qcom_qspi {
  	struct device *dev;
  	struct clk_bulk_data *clks;
  	struct qspi_xfer xfer;
-	/* Lock to protect xfer and IRQ accessed registers */
+	struct icc_path *icc_path_cpu_to_qspi;
+	unsigned int avg_bw_cpu;
+	unsigned int peak_bw_cpu;

This triplet is a recurring pattern, and is probably not limited to geni SE/QSPI.
On https://patchwork.kernel.org/patch/11436889/#23221925 I suggested the creation
of a geni SE specific struct, however adding a generic convenience struct to
'linux/interconnect.h' might be the better solution:

struct icc_client {
	struct icc_path *path;
	unsigned int avg_bw;
	unsigned int peak_bw;
};

I'm sure there are better names for it, but this would be the idea.

Yeah, I think introducing this to ICC header would be better solution.

Regards,

Akash

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