| Message ID | 1542116782-13118-6-git-send-email-frieder.schrempf@kontron.de |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Port the FSL QSPI driver to the SPI framework | expand |
On Tue, 13 Nov 2018 13:47:37 +0000, Schrempf Frieder wrote: > Adjust the documentation of the new SPI memory interface based > driver to reflect the new drivers settings. > > The "old" driver was using the "fsl,qspi-has-second-chip" property to > select one of two dual chip setups (two chips on one bus or two chips > on separate buses). And it used the order in which the subnodes are > defined in the dt to select the CS, the chip is connected to. > > Both methods are wrong and in fact the "reg" property should be used to > determine which bus and CS a chip is connected to. This also enables us > to use different setups than just single chip, or symmetric dual chip. > > So the porting of the driver from the MTD to the SPI framework actually > enforces the use of the "reg" properties and makes > "fsl,qspi-has-second-chip" superfluous. > > As all boards that have "fsl,qspi-has-second-chip" set, also have > correct "reg" properties, the removal of this property shouldn't lead to > any incompatibilities. > > The only compatibility issues I can see are with imx6sx-sdb.dts and > imx6sx-sdb-reva.dts, which have their reg properties set incorrectly > (see explanation here: [2]), all other boards should stay compatible. > > Also the "big-endian" flag was removed, as this setting is now selected > by the driver, depending on which SoC is in use. > > [2] https://patchwork.ozlabs.org/patch/922817/#1925445 > > Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de> > --- > .../devicetree/bindings/spi/spi-fsl-qspi.txt | 18 ++++++++---------- > 1 file changed, 8 insertions(+), 10 deletions(-) > Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt index 483e9cf..e8f1d62 100644 --- a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt +++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt @@ -14,15 +14,13 @@ Required properties: - clocks : The clocks needed by the QuadSPI controller - clock-names : Should contain the name of the clocks: "qspi_en" and "qspi". -Optional properties: - - fsl,qspi-has-second-chip: The controller has two buses, bus A and bus B. - Each bus can be connected with two NOR flashes. - Most of the time, each bus only has one NOR flash - connected, this is the default case. - But if there are two NOR flashes connected to the - bus, you should enable this property. - (Please check the board's schematic.) - - big-endian : That means the IP register is big endian +Required SPI slave node properties: + - reg: There are two buses (A and B) with two chip selects each. + This encodes to which bus and CS the flash is connected: + <0>: Bus A, CS 0 + <1>: Bus A, CS 1 + <2>: Bus B, CS 0 + <3>: Bus B, CS 1 Example: @@ -40,7 +38,7 @@ qspi0: quadspi@40044000 { }; }; -Example showing the usage of two SPI NOR devices: +Example showing the usage of two SPI NOR devices on bus A: &qspi2 { pinctrl-names = "default";
Adjust the documentation of the new SPI memory interface based driver to reflect the new drivers settings. The "old" driver was using the "fsl,qspi-has-second-chip" property to select one of two dual chip setups (two chips on one bus or two chips on separate buses). And it used the order in which the subnodes are defined in the dt to select the CS, the chip is connected to. Both methods are wrong and in fact the "reg" property should be used to determine which bus and CS a chip is connected to. This also enables us to use different setups than just single chip, or symmetric dual chip. So the porting of the driver from the MTD to the SPI framework actually enforces the use of the "reg" properties and makes "fsl,qspi-has-second-chip" superfluous. As all boards that have "fsl,qspi-has-second-chip" set, also have correct "reg" properties, the removal of this property shouldn't lead to any incompatibilities. The only compatibility issues I can see are with imx6sx-sdb.dts and imx6sx-sdb-reva.dts, which have their reg properties set incorrectly (see explanation here: [2]), all other boards should stay compatible. Also the "big-endian" flag was removed, as this setting is now selected by the driver, depending on which SoC is in use. [2] https://patchwork.ozlabs.org/patch/922817/#1925445 Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de> --- .../devicetree/bindings/spi/spi-fsl-qspi.txt | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-)