On Tue, Oct 13, 2015 at 02:04:22PM -0400, WingMan Kwok wrote: > On TI's Keystone platforms, several peripherals such as the > gbe ethernet switch, 10gbe ethernet switch and PCIe controller > require the use of a SerDes for converting SoC parallel data into > serialized data that can be output over a high-speed electrical > interface, and also converting high-speed serial input data > into parallel data that can be processed by the SoC. The > SerDeses used by those peripherals, though they may be different, > are largely similar in functionality and setup. > > This patch provides a SerDes phy driver implementation that can be > used by the above mentioned peripheral drivers to configure their > respective SerDeses. > > Signed-off-by: WingMan Kwok <w-kw...@ti.com> > --- > Documentation/devicetree/bindings/phy/ti-phy.txt | 256 +++ > drivers/phy/Kconfig | 8 + > drivers/phy/Makefile | 1 + > drivers/phy/phy-keystone-serdes.c | 2465 > ++++++++++++++++++++++ > 4 files changed, 2730 insertions(+) > create mode 100644 drivers/phy/phy-keystone-serdes.c > > diff --git a/Documentation/devicetree/bindings/phy/ti-phy.txt > b/Documentation/devicetree/bindings/phy/ti-phy.txt > index 9cf9446..231716e 100644 > --- a/Documentation/devicetree/bindings/phy/ti-phy.txt > +++ b/Documentation/devicetree/bindings/phy/ti-phy.txt > @@ -115,4 +115,260 @@ sata_phy: phy@4A096000 { > clock-names = "sysclk", "refclk"; > syscon-pllreset = <&scm_conf 0x3fc>; > #phy-cells = <0>; > + > +TI Keystone SerDes PHY > +====================== > + > +Required properties: > + - compatible: should be one of > + * "ti,keystone-serdes-gbe" > + * "ti,keystone-serdes-xgbe" > + * "ti,keystone-serdes-pcie" > + - reg: > + * base address and length of the SerDes register set > + - reg-names: > + * "reg_serdes" > + - name of the reg SerDes register set
Just describe reg in terms of reg-names, and don't bother with the "reg_" prefix, we know this is a reg entry: - reg: a list of address and length pairs, corresponding to entires in reg-names - reg-names: should contain: * "serdes" > + - #phy-cells: > + * From the generic phy bindings, must be 0; > + - max-lanes: > + * Number of lanes in SerDes. Why is this not "num-lanes"? Why do you even need this? > + - phy-type: should be one of > + * "sgmii" > + * "xge" > + * "pcie" > + > +Optional properties: > + - syscon-peripheral: > + * Handle to the subsystem register region of the peripheral > + inside which the SerDes exists. > + - syscon-link: > + * Handle to the Link register region of the peripheral inside > + which the SerDes exists. Example: it is the PCSR register > + region in the case of 10gbe. > + - refclk-khz: > + * Reference clock rate of SerDes in kHz. Surely this should be an actual clock? > + - link-rate-kbps: > + * SerDes link rate to be configured, in kbps. Why does this need to be in the binding? How does one derive the correct value? > + - control-rate: > + * Lane control rate > + 0: full rate > + 1: half rate > + 2: quarter rate Likewise on both points. > + - rx-start: > + * Initial lane rx equalizer attenuation and boost configurations. > + * Must be array of 2 integers. > + - rx-force: > + * Forced lane rx equalizer attenuation and boost configurations. > + * Must be array of 2 integers. > + - tx-coeff: > + * Lane c1, c2, cm, attenuation and regulator outpust voltage > + configurations. > + * Must be array of 5 integers. s/outpust/output/ > + - debug: > + * enable more debug messages. NAK. This is a driver option, and belongs on the kernel command line. It does not describe the hardware, and does not belong in the DT. > +Example for Keystone K2E GBE: > +----------------------------- > + > +gbe_serdes0: gbe_serdes@232a000 { > + #phy-cells = <0>; > + compatible = "ti,keystone-serdes-gbe"; > + reg = <0x0232a000 0x2000>; > + reg-names = "reg_serdes"; > + refclk-khz = <156250>; > + link-rate-kbps = <1250000>; > + phy-type = "sgmii"; > + max-lanes = <4>; > + lane0 { > + control-rate = <2>; /* quart */ > + rx-start = <7 5>; > + rx-force = <1 1>; > + tx-coeff = <0 0 0 12 4>; > + /* c1 c2 cm att vreg */ > + }; > + lane1 { > + control-rate = <2>; /* quart */ > + rx-start = <7 5>; > + rx-force = <1 1>; > + tx-coeff = <0 0 0 12 4>; > + /* c1 c2 cm att vreg */ > + }; The binding didn't describe the sub-nodes, and which properties belong to them. Don't use magic names. Define a new address space, and use reg to identify lanes. > + if (of_find_property(np, "disable", NULL)) > + lc->enable = 0; > + else > + lc->enable = 1; This was not described in the binding, and uses the wrong accessor. What is this for? > + if (of_find_property(np, "loopback", NULL)) > + lc->loopback = 1; > + else > + lc->loopback = 0; Likewise. > + if (of_property_read_bool(np, "syscon-peripheral")) { > + sc->peripheral_regmap = > + syscon_regmap_lookup_by_phandle(np, > + "syscon-peripheral"); Can't you always call syscon_regmap_lookup_by_phandle, then check the return value to see if the property existed? You clearly know that of_property_read_bool exists, why did you not use it to read properties which are boolean? > + if (of_property_read_bool(np, "syscon-link")) { > + sc->pcsr_regmap = > + syscon_regmap_lookup_by_phandle(np, "syscon-link"); Likewise. > + sc->debug = of_property_read_bool(np, "debug"); As stated above, NAK for this property. > + > + if (of_find_property(np, "rx-force-enable", NULL)) > + sc->rx_force_enable = 1; > + else > + sc->rx_force_enable = 0; Not in the binding, and uses the wrong accessor. > + > + for (i = 0; i < sc->lanes; i++) { > + sprintf(&name[4], "%d", i); > + lp = of_find_node_by_name(np, name); > + if (lp) { > + if (kserdes_get_lane_bindings(dev, lp, &sc->lane[i])) > + return -EINVAL; > + } > + } As above, use reg, not magic names. Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/