[PATCH v2 0/2] clk: qcom: Quad SPI (qspi) clock support for sdm845

[PATCH v2 0/2] clk: qcom: Quad SPI (qspi) clock support for sdm845

[Douglas Anderson]

This two-series patch adds the needed clock bits to use the Quad SPI
(qspi) part on sdm845.  It's expected that the bindings part of this
patch could land in the clock tree with an immutable git hash and then
be pulled into the Qualcomm tree so it could be used by dts files.

>From the reply to my v1, the clock plan for this clock is:
- MinSVS@19.2
- LowSVS@75
- SVS@150
- Nominal@300
...and intermediate frequencies can be used at frequences less than
300.  I didn't see a need for 75 MHz and it was unclear from previous
replies if this should come from MAIN or EVEN so I left it out.  I
have added 100 MHz here since it is useful (/ 4 = 25 MHz is a useful
clock for SPI flash)

OTHER NOTES:
- From probing lines, it appears that the Quad SPI block has a divide
  by 4 somewhere inside it (probably so it can oversample the lines,
  or possibly so it can generate phase-offset clocks).  Thus we need
  the core to go 4 times faster than we'd expect to run the SPI bus.
- SPI devices usually specify the MAX frequency they should be clocked
  at, so it's important that we use the clk_rcg2_floor_ops here rather
  than the clk_rcg2_ops

Changes in v2:
- Only 19.2, 100, 150, and 300 MHz now.
- All clocks come from MAIN rather than EVEN.
- Use parent map 0 instead of new parent map 9.

Douglas Anderson (2):
  clk: qcom: Add qspi (Quad SPI) clock defines for sdm845 to header
  clk: qcom: Add qspi (Quad SPI) clocks for sdm845

 drivers/clk/qcom/gcc-sdm845.c               | 63 +++++++++++++++++++++
 include/dt-bindings/clock/qcom,gcc-sdm845.h |  3 +
 2 files changed, 66 insertions(+)

-- 
2.18.0.233.g985f88cf7e-goog

[PATCH v2 1/2] clk: qcom: Add qspi (Quad SPI) clock defines for sdm845 to header

[Douglas Anderson]

These clocks will need to be defined in the clock driver and
referenced in device tree files.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

Changes in v2: None

 include/dt-bindings/clock/qcom,gcc-sdm845.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/dt-bindings/clock/qcom,gcc-sdm845.h b/include/dt-bindings/clock/qcom,gcc-sdm845.h
index f96fc2dbf60e..b8eae5a76503 100644
--- a/include/dt-bindings/clock/qcom,gcc-sdm845.h
+++ b/include/dt-bindings/clock/qcom,gcc-sdm845.h
@@ -194,6 +194,9 @@
 #define GPLL4							184
 #define GCC_CPUSS_DVM_BUS_CLK					185
 #define GCC_CPUSS_GNOC_CLK					186
+#define GCC_QSPI_CORE_CLK_SRC					187
+#define GCC_QSPI_CORE_CLK					188
+#define GCC_QSPI_CNOC_PERIPH_AHB_CLK				189
 
 /* GCC Resets */
 #define GCC_MMSS_BCR						0
-- 
2.18.0.233.g985f88cf7e-goog