> Subject: Re: [PATCH v2 1/2] dt-bindings: firmware: arm,scmi: Add properties > for i.MX95 Pinctrl OEM extensions > > On Wed, May 01, 2024 at 12:11:41PM +0000, Peng Fan wrote: > > > Subject: Re: [PATCH v2 1/2] dt-bindings: firmware: arm,scmi: Add > > > properties for i.MX95 Pinctrl OEM extensions > > > > > > On Thu, Apr 25, 2024 at 09:06:00AM +0000, Peng Fan wrote: > > > > Hi Rob, > > > > > > > > > Subject: Re: [PATCH v2 1/2] dt-bindings: firmware: arm,scmi: Add > > > > > properties for i.MX95 Pinctrl OEM extensions > > > > > > > > > > On Thu, Apr 18, 2024 at 10:53:17AM +0800, Peng Fan (OSS) wrote: > > > > > > From: Peng Fan <peng.fan@xxxxxxx> > > > > > > > > > > > > i.MX95 Pinctrl is managed by SCMI firmware using OEM extensions. > > > > > > This patch is to add i.MX95 Pinctrl OEM extensions properties. > > > > > > > > > > > > Signed-off-by: Peng Fan <peng.fan@xxxxxxx> > > > > > > --- > > > > > > .../devicetree/bindings/firmware/arm,scmi.yaml | 9 ++- > > > > > > .../bindings/firmware/nxp,imx95-scmi-pinctrl.yaml | 66 > > > > > > ++++++++++++++++++++++ > > > > > > 2 files changed, 72 insertions(+), 3 deletions(-) > > > > > > > > > > > > diff --git > > > > > > a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml > > > > > > b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml > > > > > > > > .... > > > > > > > > > > + > > > > > > +title: i.MX System Control and Management Interface (SCMI) > > > > > > +Pinctrl Protocol > > > > > > + > > > > > > +maintainers: > > > > > > + - Peng Fan <peng.fan@xxxxxxx> > > > > > > + > > > > > > +patternProperties: > > > > > > + '[a-f0-9]+$': > > > > > > + type: object > > > > > > + unevaluatedProperties: false > > > > > > + > > > > > > + properties: > > > > > > + pins: > > > > > > + $ref: /schemas/types.yaml#/definitions/string > > > > > > + description: name of the pin > > > > > > + items: > > > > > > + enum: [ daptdi, daptmsswdio, daptclkswclk, daptdotraceswo, > > > > > > + gpioio00, gpioio01, gpioio02, gpioio03, > > > > > > + gpioio04, > > > > > > > > > > ioio? > > > > > > > > Yes. The name is exported from SCMI firmware. > > > > > > > > > > > > > > > + gpioio05, gpioio06, gpioio07, gpioio08, gpioio09, > > > > > > + gpioio10, gpioio11, gpioio12, gpioio13, gpioio14, > > > > > > + gpioio15, gpioio16, gpioio17, gpioio18, gpioio19, > > > > > > + gpioio20, gpioio21, gpioio22, gpioio23, gpioio24, > > > > > > + gpioio25, gpioio26, gpioio27, gpioio28, gpioio29, > > > > > > + gpioio30, gpioio31, gpioio32, gpioio33, gpioio34, > > > > > > + gpioio35, gpioio36, gpioio37, ccmclko1, ccmclko2, > > > > > > + ccmclko3, ccmclko4, enet1mdc, enet1mdio, enet1td3, > > > > > > + enet1td2, enet1td1, enet1td0, enet1txctl, enet1txc, > > > > > > + enet1rxctl, enet1rxc, enet1rd0, enet1rd1, enet1rd2, > > > > > > + enet1rd3, enet2mdc, enet2mdio, enet2td3, enet2td2, > > > > > > + enet2td1, enet2td0, enet2txctl, enet2txc, enet2rxctl, > > > > > > + enet2rxc, enet2rd0, enet2rd1, enet2rd2, enet2rd3, > > > > > > + sd1clk, sd1cmd, sd1data0, sd1data1, sd1data2, sd1data3, > > > > > > + sd1data4, sd1data5, sd1data6, sd1data7, sd1strobe, > > > > > > + sd2vselect, sd3clk, sd3cmd, sd3data0, sd3data1, > > > > > > + sd3data2, sd3data3, xspi1data0, xspi1data1, xspi1data2, > > > > > > + xspi1data3, xspi1data4, xspi1data5, xspi1data6, > > > > > > + xspi1data7, xspi1dqs, xspi1sclk, xspi1ss0b, xspi1ss1b, > > > > > > + sd2cdb, sd2clk, sd2cmd, sd2data0, sd2data1, sd2data2, > > > > > > + sd2data3, sd2resetb, i2c1scl, i2c1sda, i2c2scl, i2c2sda, > > > > > > + uart1rxd, uart1txd, uart2rxd, uart2txd, pdmclk, > > > > > > + pdmbitstream0, pdmbitstream1, sai1txfs, sai1txc, > > > > > > + sai1txd0, sai1rxd0, wdogany, fccuerr0 ] > > > > > > + > > > > > > + nxp,func-id: > > > > > > + $ref: /schemas/types.yaml#/definitions/uint32 > > > > > > + description: Indicates the PAD connections which > > > > > > + function module > > > > > > > > > > The description makes no sense... > > > > > > > > I will use below description in v3: > > > > For each pin, there are up to 8 muxing options (called ALT modes). > > > > For > > > example: > > > > Select 1 of 5 iomux modes to be used for pad: DAP_TCLK_SWCLK. > > > > 000b - Select mux mode: ALT0 mux port: JTAG_MUX_TCK of instance: > > > > jtag_mux 010b - Select mux mode: ALT2 mux port: CAN4_RX of instance: > > > > imx95_wakeupmix_top 100b - Select mux mode: ALT4 mux port: > > > > FLEXIO1_FLEXIO30 of instance: imx95_wakeupmix_top 101b - Select > > > > mux > > > > mode: ALT5 mux port: GPIO3_IO30 of instance: imx95_wakeupmix_top > > > 110b > > > > - Select mux mode: ALT6 mux port: LPUART5_CTS_B of instance: > > > imx95_wakeupmix_top The nxp,func-id property is selecting one ALT > mode. > > > > > > > > > > > > > > > + > > > > > > + nxp,pin-conf: > > > > > > + $ref: /schemas/types.yaml#/definitions/uint32 > > > > > > + description: The PAD configuration > > > > > > > > > > PAD stands for? Or is it pin configuration as the property name says? > > > > > > > > It is pin configuration which includes pull up/down, drive strength and > etc. > > > > > > > > > > > > > > This is just a raw register values? > > > > > > > > Yes. > > > > > > > > Why can't standard pinctrl properties be > > > > > used here. What's the point of using SCMI pinctrl if you are > > > > > just shuttling register values to SCMI? > > > > > > > > Standard pinctrl properties will need more memory in our SCMI > > > > firmware design. We have limited on-chip memory for SCMI firmware > usage. > > > > > > > > > > So you sort of strip-down the server due to hw constraints, but is > > > it the SCMI server still compliant with the spec ? (as in supporting > > > all the mandatory commands and features for the protocols you > > > decided to > > > support) > > > > Yes, the SCMI server is compliant with the spec. It is the SCMI > > firmware returns num function with value zero, num group with value zero. > > > > And only OEM pin configure type supported in our SCMI firmware. > > > > I have posted out v3 following Rob's suggestion, using property > > 'pinmux', but now we could not reuse pinctrl-scmi.c > > As I wrote in a separated thread (only 5 mins ago), if you have written a > distinct SCMI driver to use protocol@19 ops to suit your needs after having > parsed your DT...why do you want to re-use pinctrl-scmi.c and so create a > dependency between the 2 ? > > The only thing that they have in common is that they are SCMI drivers using > SCMI Pinctrl protocol@19 operations in their own different way. Yes. I have replied there. I thought to reuse pinctrl-scmi.c with minimal changes, but since the binding changes in v3, I need to made big changes. Anyway I agree with your suggestions to decouple the two drivers. I will do that in v4. Before that, I need wait for dt-maintainers to review the binding changes in v3. Thanks, Peng. > > Thanks, > Cristian
