| Message ID | 20200228043636.559915-4-gch981213@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | rewrite mtk-quadspi spi-nor driver with spi-mem | expand |
On Fri, Feb 28, 2020 at 12:36:35PM +0800, Chuanhong Guo wrote: > spi-mtk-nor is a driver to replace mtk-quadspi and they have almost > the same device-tree bindings. Reuse this binding documentation and > convert it for new driver: > > 1. "Mediatek SoCs" -> "Mediatek ARM SoCs" because MTK MIPS SoCs > use different controllers. > 2. document "interrupts" as a required property because it's > available on all SoCs with this controller and new driver takes > advantages of it. It's implemented as optional only to maintain > backward compatibility. > 3. replace binding example with a mt7629 one because this is the > only one I know the interrupt assignment. That doesn't really matter. It would be less churn without that change and examples are just examples. > > Signed-off-by: Chuanhong Guo <gch981213@gmail.com> > --- > Change since v1: > none > > .../mtk-quadspi.txt => spi/spi-mtk-nor.txt} | 34 ++++++++----------- > 1 file changed, 15 insertions(+), 19 deletions(-) > rename Documentation/devicetree/bindings/{mtd/mtk-quadspi.txt => spi/spi-mtk-nor.txt} (62%) > > diff --git a/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt b/Documentation/devicetree/bindings/spi/spi-mtk-nor.txt > similarity index 62% > rename from Documentation/devicetree/bindings/mtd/mtk-quadspi.txt > rename to Documentation/devicetree/bindings/spi/spi-mtk-nor.txt > index a12e3b5c495d..829da480b9a9 100644 > --- a/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt > +++ b/Documentation/devicetree/bindings/spi/spi-mtk-nor.txt > @@ -1,4 +1,4 @@ > -* Serial NOR flash controller for MediaTek SoCs > +* SPI NOR flash controller for MediaTek ARM SoCs > > Required properties: > - compatible: For mt8173, compatible should be "mediatek,mt8173-nor", > @@ -13,6 +13,7 @@ Required properties: > "mediatek,mt7629-nor", "mediatek,mt8173-nor" > "mediatek,mt8173-nor" > - reg: physical base address and length of the controller's register > +- interrupts: Interrupt number used by the controller. > - clocks: the phandle of the clocks needed by the nor controller > - clock-names: the names of the clocks > the clocks should be named "spi" and "sf". "spi" is used for spi bus, > @@ -22,29 +23,24 @@ Required properties: > - #address-cells: should be <1> > - #size-cells: should be <0> > > -The SPI flash must be a child of the nor_flash node and must have a > -compatible property. Also see jedec,spi-nor.txt. > - > -Required properties: > -- compatible: May include a device-specific string consisting of the manufacturer > - and name of the chip. Must also include "jedec,spi-nor" for any > - SPI NOR flash that can be identified by the JEDEC READ ID opcode (0x9F). > -- reg : Chip-Select number > +There should be only one spi slave device following generic spi bindings. > +It's not recommended to use this controller for devices other than SPI NOR > +flash due to limited transfer capability of this controller. > > Example: > +#include <dt-bindings/interrupt-controller/irq.h> > +#include <dt-bindings/interrupt-controller/arm-gic.h> > +#include <dt-bindings/clock/mt7629-clk.h> > > -nor_flash: spi@1100d000 { > - compatible = "mediatek,mt8173-nor"; > - reg = <0 0x1100d000 0 0xe0>; > - clocks = <&pericfg CLK_PERI_SPI>, > - <&topckgen CLK_TOP_SPINFI_IFR_SEL>; > +spi_nor: spi@11014000 { > + compatible = "mediatek,mt7629-nor", > + "mediatek,mt8173-nor"; > + reg = <0x11014000 0xe0>; > + interrupts = <GIC_SPI 88 IRQ_TYPE_LEVEL_LOW>; > + clocks = <&pericfg CLK_PERI_FLASH_PD>, > + <&topckgen CLK_TOP_FLASH_SEL>; > clock-names = "spi", "sf"; > #address-cells = <1>; > #size-cells = <0>; > - > - flash@0 { > - compatible = "jedec,spi-nor"; > - reg = <0>; > - }; Better to leave this in the example IMO. Rob
On Wed, Mar 4, 2020 at 6:47 AM Rob Herring <robh@kernel.org> wrote: > > 3. replace binding example with a mt7629 one because this is the > > only one I know the interrupt assignment. > > That doesn't really matter. It would be less churn without that change > and examples are just examples. > [...] > > - > > - flash@0 { > > - compatible = "jedec,spi-nor"; > > - reg = <0>; > > - }; > > Better to leave this in the example IMO. > > Rob I'll revert example changes and add a dummy interrupt binding instead in v3.
diff --git a/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt b/Documentation/devicetree/bindings/spi/spi-mtk-nor.txt similarity index 62% rename from Documentation/devicetree/bindings/mtd/mtk-quadspi.txt rename to Documentation/devicetree/bindings/spi/spi-mtk-nor.txt index a12e3b5c495d..829da480b9a9 100644 --- a/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt +++ b/Documentation/devicetree/bindings/spi/spi-mtk-nor.txt @@ -1,4 +1,4 @@ -* Serial NOR flash controller for MediaTek SoCs +* SPI NOR flash controller for MediaTek ARM SoCs Required properties: - compatible: For mt8173, compatible should be "mediatek,mt8173-nor", @@ -13,6 +13,7 @@ Required properties: "mediatek,mt7629-nor", "mediatek,mt8173-nor" "mediatek,mt8173-nor" - reg: physical base address and length of the controller's register +- interrupts: Interrupt number used by the controller. - clocks: the phandle of the clocks needed by the nor controller - clock-names: the names of the clocks the clocks should be named "spi" and "sf". "spi" is used for spi bus, @@ -22,29 +23,24 @@ Required properties: - #address-cells: should be <1> - #size-cells: should be <0> -The SPI flash must be a child of the nor_flash node and must have a -compatible property. Also see jedec,spi-nor.txt. - -Required properties: -- compatible: May include a device-specific string consisting of the manufacturer - and name of the chip. Must also include "jedec,spi-nor" for any - SPI NOR flash that can be identified by the JEDEC READ ID opcode (0x9F). -- reg : Chip-Select number +There should be only one spi slave device following generic spi bindings. +It's not recommended to use this controller for devices other than SPI NOR +flash due to limited transfer capability of this controller. Example: +#include <dt-bindings/interrupt-controller/irq.h> +#include <dt-bindings/interrupt-controller/arm-gic.h> +#include <dt-bindings/clock/mt7629-clk.h> -nor_flash: spi@1100d000 { - compatible = "mediatek,mt8173-nor"; - reg = <0 0x1100d000 0 0xe0>; - clocks = <&pericfg CLK_PERI_SPI>, - <&topckgen CLK_TOP_SPINFI_IFR_SEL>; +spi_nor: spi@11014000 { + compatible = "mediatek,mt7629-nor", + "mediatek,mt8173-nor"; + reg = <0x11014000 0xe0>; + interrupts = <GIC_SPI 88 IRQ_TYPE_LEVEL_LOW>; + clocks = <&pericfg CLK_PERI_FLASH_PD>, + <&topckgen CLK_TOP_FLASH_SEL>; clock-names = "spi", "sf"; #address-cells = <1>; #size-cells = <0>; - - flash@0 { - compatible = "jedec,spi-nor"; - reg = <0>; - }; };
spi-mtk-nor is a driver to replace mtk-quadspi and they have almost the same device-tree bindings. Reuse this binding documentation and convert it for new driver: 1. "Mediatek SoCs" -> "Mediatek ARM SoCs" because MTK MIPS SoCs use different controllers. 2. document "interrupts" as a required property because it's available on all SoCs with this controller and new driver takes advantages of it. It's implemented as optional only to maintain backward compatibility. 3. replace binding example with a mt7629 one because this is the only one I know the interrupt assignment. Signed-off-by: Chuanhong Guo <gch981213@gmail.com> --- Change since v1: none .../mtk-quadspi.txt => spi/spi-mtk-nor.txt} | 34 ++++++++----------- 1 file changed, 15 insertions(+), 19 deletions(-) rename Documentation/devicetree/bindings/{mtd/mtk-quadspi.txt => spi/spi-mtk-nor.txt} (62%)