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Date: Tue, 13 Oct 2015 19:33:27 +0100
From: Mark Rutland <mark.rutland@....com>
To: WingMan Kwok <w-kwok2@...com>
Cc: robh+dt@...nel.org, pawel.moll@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org, kishon@...com,
rogerq@...com, m-karicheri2@...com, bhelgaas@...gle.com,
ssantosh@...nel.org, linux@....linux.org.uk,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] phy: keystone: serdes driver for gbe 10gbe and pcie
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-kwok2@...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@...96000 {
> 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@...a000 {
> + #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.
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