| Message ID | 1530789310-16254-6-git-send-email-frieder.schrempf@exceet.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Jul 05, 2018 at 01:15:01PM +0200, Frieder Schrempf wrote: > Adjust the documentation of the new SPI memory interface based > driver to reflect the new drivers settings. Bindings shouldn't change (other than new properties) due to driver changes. > > Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de> > --- > Changes in v2: > ============== > * Split the moving and editing of the dt-bindings in two patches > > .../devicetree/bindings/spi/spi-fsl-qspi.txt | 22 ++++++++++---------- > 1 file changed, 11 insertions(+), 11 deletions(-) > > diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt > index 483e9cf..8b4eed7 100644 > --- a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt > +++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt > @@ -3,9 +3,8 @@ > Required properties: > - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi", > "fsl,imx7d-qspi", "fsl,imx6ul-qspi", > - "fsl,ls1021a-qspi" > + "fsl,ls1021a-qspi", "fsl,ls2080a-qspi" > or > - "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi", > "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi" So the 2080a h/w was compatible with the 1021a h/w, but now it is not? How did the h/w change? > - reg : the first contains the register location and length, > the second contains the memory mapping address and length > @@ -15,14 +14,15 @@ Required properties: > - 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.) You can't just remove properties without explanation. Why is this no longer needed? What about backwards compatibility with existing dtbs? > - - big-endian : That means the IP register is big endian > + - big-endian : That means the IP registers format is big endian This is a standard property so it doesn't really need to be redefined here, but just reference the definition. > + > +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 +40,7 @@ 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"; > -- > 2.7.4 > -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Rob, On 11.07.2018 18:05, Rob Herring wrote: > On Thu, Jul 05, 2018 at 01:15:01PM +0200, Frieder Schrempf wrote: >> Adjust the documentation of the new SPI memory interface based >> driver to reflect the new drivers settings. > > Bindings shouldn't change (other than new properties) due to driver > changes. Right, I added an explanation below, why I think the changes are necessary. > >> >> Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de> >> --- >> Changes in v2: >> ============== >> * Split the moving and editing of the dt-bindings in two patches >> >> .../devicetree/bindings/spi/spi-fsl-qspi.txt | 22 ++++++++++---------- >> 1 file changed, 11 insertions(+), 11 deletions(-) >> >> diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt >> index 483e9cf..8b4eed7 100644 >> --- a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt >> +++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt >> @@ -3,9 +3,8 @@ >> Required properties: >> - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi", >> "fsl,imx7d-qspi", "fsl,imx6ul-qspi", >> - "fsl,ls1021a-qspi" >> + "fsl,ls1021a-qspi", "fsl,ls2080a-qspi" >> or >> - "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi", >> "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi" > > So the 2080a h/w was compatible with the 1021a h/w, but now it is not? > How did the h/w change? I guess this should be posted as a separate fix. Formerly there was only "fsl,ls1021a-qspi" handled in the driver and the bindings here claimed that "fsl,ls2080a-qspi" is compatible. Some time ago a separate entry for "fsl,ls2080a-qspi" was added to the driver [1] and it adds a quirk, that is not set for "fsl,ls1021a-qspi". That's why I concluded, that these two are actually not compatible. > >> - reg : the first contains the register location and length, >> the second contains the memory mapping address and length >> @@ -15,14 +14,15 @@ Required properties: >> - 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.) > > You can't just remove properties without explanation. Why is this no > longer needed? What about backwards compatibility with existing dtbs? You're right, the explanation is missing here. The "old" driver was using this 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. > >> - - big-endian : That means the IP register is big endian >> + - big-endian : That means the IP registers format is big endian > > This is a standard property so it doesn't really need to be redefined > here, but just reference the definition. So I will change that to: big-endian : See common-properties.txt for a definition Thanks, Frieder [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/mtd/spi-nor/fsl-quadspi.c?h=v4.18-rc4&id=d728a7ea9037c2df085bf9494d56e90d0ff69d7d [2] https://patchwork.ozlabs.org/patch/922817/#1925445 > >> + >> +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 +40,7 @@ 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"; >> -- >> 2.7.4 >> -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thu, Jul 12, 2018 at 2:14 AM Frieder Schrempf <frieder.schrempf@exceet.de> wrote: > > Hi Rob, > > On 11.07.2018 18:05, Rob Herring wrote: > > On Thu, Jul 05, 2018 at 01:15:01PM +0200, Frieder Schrempf wrote: > >> Adjust the documentation of the new SPI memory interface based > >> driver to reflect the new drivers settings. > > > > Bindings shouldn't change (other than new properties) due to driver > > changes. > > Right, I added an explanation below, why I think the changes are necessary. > > > > >> > >> Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de> > >> --- > >> Changes in v2: > >> ============== > >> * Split the moving and editing of the dt-bindings in two patches > >> > >> .../devicetree/bindings/spi/spi-fsl-qspi.txt | 22 ++++++++++---------- > >> 1 file changed, 11 insertions(+), 11 deletions(-) > >> > >> diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt > >> index 483e9cf..8b4eed7 100644 > >> --- a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt > >> +++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt > >> @@ -3,9 +3,8 @@ > >> Required properties: > >> - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi", > >> "fsl,imx7d-qspi", "fsl,imx6ul-qspi", > >> - "fsl,ls1021a-qspi" > >> + "fsl,ls1021a-qspi", "fsl,ls2080a-qspi" > >> or > >> - "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi", > >> "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi" > > > > So the 2080a h/w was compatible with the 1021a h/w, but now it is not? > > How did the h/w change? > > I guess this should be posted as a separate fix. Formerly there was only > "fsl,ls1021a-qspi" handled in the driver and the bindings here claimed > that "fsl,ls2080a-qspi" is compatible. > > Some time ago a separate entry for "fsl,ls2080a-qspi" was added to the > driver [1] and it adds a quirk, that is not set for "fsl,ls1021a-qspi". > That's why I concluded, that these two are actually not compatible. So before the driver change, the driver didn't work at all on the ls2080a? If so, then removing is appropriate. If not, then removing breaks all kernel versions before the change if you use a newer DT. > >> - reg : the first contains the register location and length, > >> the second contains the memory mapping address and length > >> @@ -15,14 +14,15 @@ Required properties: > >> - 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.) > > > > You can't just remove properties without explanation. Why is this no > > longer needed? What about backwards compatibility with existing dtbs? > > You're right, the explanation is missing here. > > The "old" driver was using this 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. Add this to the commit msg. > >> - - big-endian : That means the IP register is big endian > >> + - big-endian : That means the IP registers format is big endian > > > > This is a standard property so it doesn't really need to be redefined > > here, but just reference the definition. > > So I will change that to: > > big-endian : See common-properties.txt for a definition You can drop "for a definition" Rob -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Rob, On 12.07.2018 17:20, Rob Herring wrote: > On Thu, Jul 12, 2018 at 2:14 AM Frieder Schrempf > <frieder.schrempf@exceet.de> wrote: >> >> Hi Rob, >> >> On 11.07.2018 18:05, Rob Herring wrote: >>> On Thu, Jul 05, 2018 at 01:15:01PM +0200, Frieder Schrempf wrote: >>>> Adjust the documentation of the new SPI memory interface based >>>> driver to reflect the new drivers settings. >>> >>> Bindings shouldn't change (other than new properties) due to driver >>> changes. >> >> Right, I added an explanation below, why I think the changes are necessary. >> >>> >>>> >>>> Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de> >>>> --- >>>> Changes in v2: >>>> ============== >>>> * Split the moving and editing of the dt-bindings in two patches >>>> >>>> .../devicetree/bindings/spi/spi-fsl-qspi.txt | 22 ++++++++++---------- >>>> 1 file changed, 11 insertions(+), 11 deletions(-) >>>> >>>> diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt >>>> index 483e9cf..8b4eed7 100644 >>>> --- a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt >>>> +++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt >>>> @@ -3,9 +3,8 @@ >>>> Required properties: >>>> - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi", >>>> "fsl,imx7d-qspi", "fsl,imx6ul-qspi", >>>> - "fsl,ls1021a-qspi" >>>> + "fsl,ls1021a-qspi", "fsl,ls2080a-qspi" >>>> or >>>> - "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi", >>>> "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi" >>> >>> So the 2080a h/w was compatible with the 1021a h/w, but now it is not? >>> How did the h/w change? >> >> I guess this should be posted as a separate fix. Formerly there was only >> "fsl,ls1021a-qspi" handled in the driver and the bindings here claimed >> that "fsl,ls2080a-qspi" is compatible. >> >> Some time ago a separate entry for "fsl,ls2080a-qspi" was added to the >> driver [1] and it adds a quirk, that is not set for "fsl,ls1021a-qspi". >> That's why I concluded, that these two are actually not compatible. > > So before the driver change, the driver didn't work at all on the > ls2080a? If so, then removing is appropriate. If not, then removing > breaks all kernel versions before the change if you use a newer DT. Before the driver change it couldn't work fully on the ls2080a, as the quirk was missing. At least that's what I deduce from the driver. > > >>>> - reg : the first contains the register location and length, >>>> the second contains the memory mapping address and length >>>> @@ -15,14 +14,15 @@ Required properties: >>>> - 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.) >>> >>> You can't just remove properties without explanation. Why is this no >>> longer needed? What about backwards compatibility with existing dtbs? >> >> You're right, the explanation is missing here. >> >> The "old" driver was using this 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. > > Add this to the commit msg. Ok. > >>>> - - big-endian : That means the IP register is big endian >>>> + - big-endian : That means the IP registers format is big endian >>> >>> This is a standard property so it doesn't really need to be redefined >>> here, but just reference the definition. >> >> So I will change that to: >> >> big-endian : See common-properties.txt for a definition > > You can drop "for a definition" Ok. Thanks, Frieder -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
============== * Split the moving and editing of the dt-bindings in two patches .../devicetree/bindings/spi/spi-fsl-qspi.txt | 22 ++++++++++---------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt index 483e9cf..8b4eed7 100644 --- a/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt +++ b/Documentation/devicetree/bindings/spi/spi-fsl-qspi.txt @@ -3,9 +3,8 @@ Required properties: - compatible : Should be "fsl,vf610-qspi", "fsl,imx6sx-qspi", "fsl,imx7d-qspi", "fsl,imx6ul-qspi", - "fsl,ls1021a-qspi" + "fsl,ls1021a-qspi", "fsl,ls2080a-qspi" or - "fsl,ls2080a-qspi" followed by "fsl,ls1021a-qspi", "fsl,ls1043a-qspi" followed by "fsl,ls1021a-qspi" - reg : the first contains the register location and length, the second contains the memory mapping address and length @@ -15,14 +14,15 @@ Required properties: - 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 + - big-endian : That means the IP registers format 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 +40,7 @@ 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. Signed-off-by: Frieder Schrempf <frieder.schrempf@exceet.de> --- Changes in v2: