Mixel DPHY support for i.MX8
Subsystems (3)
v7 cover Mixel DPHY support for i.MX8
tl;dr: v7 fixes a build issued due to the lack of a HAS_IOMEM
This adds initial support for the Mixel IP based mipi dphy as found on i.MX8 processors. It has support for the i.MX8MQ, support for other variants can be added - once the platform specific parts are in - via the provided devdata. The driver is somewhat based on what's found in NXPs BSP.
Public documentation on the DPHY's registers is currently thin in the i.MX8 reference manuals (even on the i.MX8QXP form 11/18) so most of the values were taken from existing drivers. Newer NXP drivers have a bit more details so where possible the timings are calculated and validated.
I've also sent out an initial version of a NWL mipi dsi host controller driver using this:
https://lists.freedesktop.org/archives/dri-devel/2019-March/209685.html
Robert Chiras (the author of the corresponding driver in NXPs vendor tree) got this driver to work in his tree as well:
https://www.spinics.net/lists/arm-kernel/msg711950.html
Chages from v6
* Depend on HAS_IOMEM (fixes a build problem on UM spotted by kbuild)
Chages from v5
* Fix build problems on mips (spotted by the kbuild test robot) by using u32 consistently and long long for lp_t.
Changes from v4
* Build by default on ARCH_MXC && ARM64
Changes form v3
* Check correct variable after devm_ioremap_resource
* Add Robert Chiras as Co-authored-by since he's the author of the driver in NXPs BSP.
Changes from v2
* As per review comments from Fabio Estevam
* KConfig: select REGMAP_MMIO
* Drop phy_read
* Don't make phy_write inline
* Remove duplicate debugging output
* Comment style and typo fixes
* Add #defines's for PLL lock timing values
* Return correct error value when PLL fails to lock
* Check error when enabling clock
* Use devm_ioremap_resource
* As per review comments from Robert Chiras
* Deassert PD_DPHY after PLL lock (as per mixel ref manual)
* Assert PD_{DPHY,PLL} before power on (as per mixel ref manual)manual
* Add exit phy_op to reset CN/CM/CO
Changes from v1
* As per review comments from Fabio Estevam
* Kconfig: tristate mixel dphy support.
* Drop unused 'ret' in mixel_dphy_ref_power_off.
* Match values of DPHY_RXL{PRP,DRP} to those of
https://source.codeaurora.org/external/imx/linux-imx/log/?h=imx_4.14.78_1.0.0_ga
The previous values were based on 4.9.
* Use resource size on devm_ioremap, we have that in dt already.
* Use regmap so it's simple to dump the registers.
* Use regmap_read_poll_timeout instead of open coded loop.
* Add undocumented rxhs_settle register
* As per review comments from Sam Ravnborg
* Move driver to d/phy/freescale/
* Move SPDX-License-Identifier to top of file.
* Drop '/* #define DEBUG 1 */'.
* Use GPL-2.0+ since the vendor driver uses that as well.
* Drop the mutex, register access is now protected by regmap.
* Fix various style / indentation issues.
* Check for register read, write and ioremap errors
* Improve phy timing calculations
* Use LP clock rate where sensible, check for errors
* Use ad hoc forumulas for timings involving hs clock
* Switch from dphy_ops to devdata. Other i.MX8 variants differ in register layout too
* Add Mixel Inc to vendor-prefixes.txt
Guido Günther (3):
dt-bindings: Add vendor prefix for Mixel Inc
dt-bindings: phy: Add documentation for mixel dphy
phy: Add driver for mixel dphy found on imx8
.../bindings/phy/mixel,mipi-dsi-phy.txt | 29 + .../devicetree/bindings/vendor-prefixes.txt | 1 + drivers/phy/freescale/Kconfig | 11 + drivers/phy/freescale/Makefile | 1 + .../phy/freescale/phy-fsl-imx8-mipi-dphy.c | 506 ++++++++++++++++++ 5 files changed, 548 insertions(+) create mode 100644 Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txt create mode 100644 drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
Signature · 1 line
2.20.1
PATCH v7 1/3 dt-bindings: Add vendor prefix for Mixel Inc
Add vendor prefix "mixel" for Mixel Inc. Will be used for a MIPI DSI PHY driver.
--- Documentation/devicetree/bindings/vendor-prefixes.txt | 1 + 1 file changed, 1 insertion(+)
Documentation/devicetree/bindings/vendor-prefixes.txt +1 -0
@@ -249,6 +249,7 @@ mikroe MikroElektronika d.o.o. minix MINIX Technology Ltd. miramems MiraMEMS Sensing Technology Co., Ltd. mitsubishi Mitsubishi Electric Corporation +mixel Mixel, Inc. mosaixtech Mosaix Technologies, Inc. motorola Motorola, Inc. moxa Moxa Inc.
Signature · 1 line
2.20.1
PATCH v7 2/3 dt-bindings: phy: Add documentation for mixel dphy
In reply to Guido GüntherAdd support for the MIXEL DPHY IP as found in the NXP's i.MX8MQ.
--- .../bindings/phy/mixel,mipi-dsi-phy.txt | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txt
Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txt new file +29 -0
@@ -0,0 +1,29 @@ +Mixel DSI PHY for i.MX8 + +The Mixel MIPI-DSI PHY IP block is e.g. found on i.MX8 platforms (along the +MIPI-DSI IP from Northwest Logic). It represents the physical layer for the +electrical signals for DSI. + +Required properties: +- compatible: Must be: + - "mixel,imx8mq-mipi-dphy" +- clocks: Must contain an entry for each entry in clock-names. +- clock-names: Must contain the following entries: + - "phy_ref": phandle and specifier referring to the DPHY ref clock +- reg: the register range of the PHY controller +- #phy-cells: number of cells in PHY, as defined in + Documentation/devicetree/bindings/phy/phy-bindings.txt + this must be <0> + +Optional properties: +- power-domains: phandle to power domain + +Example: + mipi_dphy: mipi_dphy@30A0030 { + compatible = "mixel,imx8mq-mipi-dphy"; + clocks = <&clk IMX8MQ_CLK_DSI_PHY_REF>; + clock-names = "phy_ref"; + reg = <0x30A00300 0x100>; + power-domains = <&pd_mipi0>; + #phy-cells = <0>; + };
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2.20.1 _______________________________________________ dri-devel mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/dri-devel
Rob Herring
maintainerRe: [PATCH v7 2/3] dt-bindings: phy: Add documentation for mixel dphy
Quoted 2 lines · Guido Günther
Add support for the MIXEL DPHY IP as found in the NXP's i.MX8MQ.
Please use get_maintainers.pl and send patches to the correct lists.
Quoted 26 lines
Signed-off-by Guido Günther <[email protected]>Reviewed-by Sam Ravnborg <[email protected]>--- .../bindings/phy/mixel,mipi-dsi-phy.txt | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txtDocumentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txt new file +12
-0@@ -0,0 +1,29 @@ +Mixel DSI PHY for i.MX8 + +The Mixel MIPI-DSI PHY IP block is e.g. found on i.MX8 platforms (along the +MIPI-DSI IP from Northwest Logic). It represents the physical layer for the +electrical signals for DSI. + +Required properties: +- compatible: Must be: + - "mixel,imx8mq-mipi-dphy" +- clocks: Must contain an entry for each entry in clock-names. +- clock-names: Must contain the following entries: + - "phy_ref": phandle and specifier referring to the DPHY ref clock
Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txt line 22
Quoted 10 lines
Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txt new file +10
-0+- reg: the register range of the PHY controller +- #phy-cells: number of cells in PHY, as defined in + Documentation/devicetree/bindings/phy/phy-bindings.txt + this must be <0> + +Optional properties: +- power-domains: phandle to power domain + +Example: + mipi_dphy: mipi_dphy@30A0030 {
dphy@30a0030
Quoted 14 lines
Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.txt new file +7
-1+ compatible = "mixel,imx8mq-mipi-dphy"; + clocks = <&clk IMX8MQ_CLK_DSI_PHY_REF>; + clock-names = "phy_ref"; + reg = <0x30A00300 0x100>; + power-domains = <&pd_mipi0>; + #phy-cells = <0>; + }; --2.20.1
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PATCH v7 3/3 phy: Add driver for mixel dphy found on imx8
In reply to Guido GüntherThis adds support for the Mixel DPHY as found on i.MX8 CPUs but since this is an IP core it will likely be found on others in the future. So instead of adding this to the nwl host driver make it a generic PHY driver.
The driver supports the i.MX8MQ. Support for i.MX8QM and i.MX8QXP can be added once the necessary system controller bits are in via mixel_dphy_devdata.
--- drivers/phy/freescale/Kconfig | 11 + drivers/phy/freescale/Makefile | 1 + .../phy/freescale/phy-fsl-imx8-mipi-dphy.c | 506 ++++++++++++++++++ 3 files changed, 518 insertions(+) create mode 100644 drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
drivers/phy/freescale/Kconfig +11 -0
@@ -3,3 +3,14 @@ config PHY_FSL_IMX8MQ_USB depends on OF && HAS_IOMEM select GENERIC_PHY default ARCH_MXC && ARM64 + +config PHY_MIXEL_MIPI_DPHY + tristate "Mixel MIPI DSI PHY support" + depends on OF && HAS_IOMEM + select GENERIC_PHY + select GENERIC_PHY_MIPI_DPHY + select REGMAP_MMIO + default ARCH_MXC && ARM64 + help + Enable this to add support for the Mixel DSI PHY as found + on NXP's i.MX8 family of SOCs.
drivers/phy/freescale/Makefile +1 -0
@@ -1 +1,2 @@ obj-$(CONFIG_PHY_FSL_IMX8MQ_USB) += phy-fsl-imx8mq-usb.o +obj-$(CONFIG_PHY_MIXEL_MIPI_DPHY) += phy-fsl-imx8-mipi-dphy.o
drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c new file +506 -0
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2.20.1 _______________________________________________ dri-devel mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/dri-devel