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Date: Thu, 9 May 2024 13:56:18 +0800
From: Richard Zhu <hongxing.zhu@....com>
To: conor@...nel.org,
vkoul@...nel.org,
kishon@...nel.org,
robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org,
frank.li@....com,
conor+dt@...nel.org
Cc: hongxing.zhu@....com,
linux-phy@...ts.infradead.org,
devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
kernel@...gutronix.de,
imx@...ts.linux.dev
Subject: [PATCH v4 0/3] Add i.MX8Q HSIO PHY support
v4 changes:
- Re-format the "phy-cells" as <&hsio_phy lane_id phy_mode controller_id>
- Use each lane as a phys entry, suggested by Rob.
PCIEA:
phys = <&hsio_phy 0 PHY_MODE_PCIE>;
or:
phys = <&hsio_phy 0 PHY_MODE_PCIE>, <&hsio_phy 1 PHY_MODE_PCIE>;
PCIEB:
phys = <&hsio_phy 1 PHY_MODE_PCIE>;
or:
phys = <&hsio_phy 2 PHY_MODE_PCIE>;
SATA:
phys = <&hsio_phy 2 PHY_MODE_SATA>;
- Add a new propery "fsl,hsio-cfg".
The HSIO configuration (fsl,hsio-cfg) is one global state.
It should be known and used to set global setting: PCIE_AB_SELECT and
PHY_X1_EPCS_SEL at the begin of HSIO initialization like this listed below.
+-------------------------------------------------------------+
|CRR(SYS.CSR) register|PCIAx2 and|PCIEAx1, PCIEBx1|PCIEAx2 and|
| |SATA |SATA |PCIEBx1 |
|---------------------|----------|----------------|-----------|
|PCIE_AB_SELECT | 0 | 1 | 1 |
|---------------------|----------|----------------|-----------|
|PHY_X1_EPCS_SEL | 1 | 1 | 0 |
+-------------------------------------------------------------+
When first PHY instance is probed, PHY driver can't get a global view of the
HSIO use case and doesn't know how to set global setting: PCIE_AB_SELECT and
PHYX1_EPCS_SEL.
Because first PHY instance doesn't know followed PHY instance use mode.
So, one property named "fsl,hsio-cfg" has to be introduced here to specify the
setting of the global setting: PCIE_AB_SELECT and PHY_X1_EPCS_SEL.
Here is the discussion about this.
https://lkml.org/lkml/2024/4/26/231
- Address Conor's comments about the "fsl,refclk-pad-mode".
fsl,refclk-pad-mode:
description:
...
enum: ["input", "output"].
v3:https://patchwork.kernel.org/project/linux-phy/cover/1713939683-15328-1-git-send-email-hongxing.zhu@nxp.com/
v3 changes:
Refer to Conor's comments.
- Let filename match a compatible
- Refine description of the fsl,refclk-pad-mode.
- Remove power-domains description.
- Keep clock ording for two devices.
- Drop the unused label and status.
Refer to Rob's comments.
- Use standard phy mode defines.
- Correct the spell mistakes in the binding document.
v2:https://patchwork.kernel.org/project/linux-phy/cover/1712036704-21064-1-git-send-email-hongxing.zhu@nxp.com/
v2 changes:
- Place the dt-bindings header file changes as the first one
in the patch-set, make the annotation more clear, and add
Frank's Reviewed-by tag.
v1:https://patchwork.kernel.org/project/linux-phy/cover/1711699790-16494-1-git-send-email-hongxing.zhu@nxp.com/
[PATCH v4 1/3] dt-bindings: phy: phy-imx8-pcie: Add header file for
[PATCH v4 2/3] dt-bindings: phy: Add i.MX8Q HSIO SerDes PHY binding
[PATCH v4 3/3] phy: freescale: imx8qm-hsio: Add i.MX8QM HSIO PHY
Documentation/devicetree/bindings/phy/fsl,imx8qm-hsio.yaml | 142 ++++++++++++++++++++
drivers/phy/freescale/Kconfig | 8 ++
drivers/phy/freescale/Makefile | 1 +
drivers/phy/freescale/phy-fsl-imx8qm-hsio.c | 598 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/dt-bindings/phy/phy-imx8-pcie.h | 29 +++++
5 files changed, 778 insertions(+)
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