From 0ba979f995324417fd773881bc5a39910a9f2362 Mon Sep 17 00:00:00 2001 From: William Zhang Date: Mon, 6 Feb 2023 22:58:13 -0800 Subject: [PATCH] spi: Add bcmbca-hsspi controller bindings The new Broadcom Broadband BCMBCA SoCs includes a updated HSSPI controller. Add new compatible strings to differentiate the old and new controller while keeping MIPS based chip with the old compatible. Update property requirements for these two revisions of the controller. Also add myself and Kursad as the maintainers. Signed-off-by: William Zhang Link: https://lore.kernel.org/r/20230207065826.285013-3-william.zhang@broadcom.com Signed-off-by: Mark Brown --- .../bindings/spi/brcm,bcm63xx-hsspi.yaml | 97 ++++++++++++++++++++-- 1 file changed, 88 insertions(+), 9 deletions(-) diff --git a/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml index 3c64699..6554978 100644 --- a/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml +++ b/Documentation/devicetree/bindings/spi/brcm,bcm63xx-hsspi.yaml @@ -4,17 +4,70 @@ $id: http://devicetree.org/schemas/spi/brcm,bcm63xx-hsspi.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# -title: Broadcom BCM6328 High Speed SPI controller +title: Broadcom Broadband SoC High Speed SPI controller maintainers: + - William Zhang + - Kursad Oney - Jonas Gorski +description: | + Broadcom Broadband SoC supports High Speed SPI master controller since the + early MIPS based chips such as BCM6328 and BCM63268. This initial rev 1.0 + controller was carried over to recent ARM based chips, such as BCM63138, + BCM4908 and BCM6858. The old MIPS based chip should continue to use the + brcm,bcm6328-hsspi compatible string. The recent ARM based chip is required to + use the brcm,bcmbca-hsspi-v1.0 as part of its compatible string list as + defined below to match the specific chip along with ip revision info. + + This rev 1.0 controller has a limitation that can not keep the chip select line + active between the SPI transfers within the same SPI message. This can + terminate the transaction to some SPI devices prematurely. The issue can be + worked around by either the controller's prepend mode or using the dummy chip + select workaround. Driver automatically picks the suitable mode based on + transfer type so it is transparent to the user. + + The newer SoCs such as BCM6756, BCM4912 and BCM6855 include an updated SPI + controller rev 1.1 that add the capability to allow the driver to control chip + select explicitly. This solves the issue in the old controller. + properties: compatible: - const: brcm,bcm6328-hsspi + oneOf: + - const: brcm,bcm6328-hsspi + - items: + - enum: + - brcm,bcm47622-hsspi + - brcm,bcm4908-hsspi + - brcm,bcm63138-hsspi + - brcm,bcm63146-hsspi + - brcm,bcm63148-hsspi + - brcm,bcm63158-hsspi + - brcm,bcm63178-hsspi + - brcm,bcm6846-hsspi + - brcm,bcm6856-hsspi + - brcm,bcm6858-hsspi + - brcm,bcm6878-hsspi + - const: brcm,bcmbca-hsspi-v1.0 + - items: + - enum: + - brcm,bcm4912-hsspi + - brcm,bcm6756-hsspi + - brcm,bcm6813-hsspi + - brcm,bcm6855-hsspi + - const: brcm,bcmbca-hsspi-v1.1 reg: - maxItems: 1 + items: + - description: main registers + - description: miscellaneous control registers + minItems: 1 + + reg-names: + items: + - const: hsspi + - const: spim-ctrl + minItems: 1 clocks: items: @@ -38,18 +91,44 @@ required: allOf: - $ref: spi-controller.yaml# + - if: + properties: + compatible: + contains: + enum: + - brcm,bcm6328-hsspi + - brcm,bcmbca-hsspi-v1.0 + then: + properties: + reg: + maxItems: 1 + reg-names: + maxItems: 1 + else: + properties: + reg: + minItems: 2 + maxItems: 2 + reg-names: + minItems: 2 + maxItems: 2 + required: + - reg-names unevaluatedProperties: false examples: - | - spi@10001000 { - compatible = "brcm,bcm6328-hsspi"; - reg = <0x10001000 0x600>; - interrupts = <29>; - clocks = <&clkctl 9>, <&hsspi_pll>; + #include + spi@ff801000 { + compatible = "brcm,bcm6756-hsspi", "brcm,bcmbca-hsspi-v1.1"; + reg = <0xff801000 0x1000>, + <0xff802610 0x4>; + reg-names = "hsspi", "spim-ctrl"; + interrupts = ; + clocks = <&hsspi>, <&hsspi_pll>; clock-names = "hsspi", "pll"; - num-cs = <2>; + num-cs = <8>; #address-cells = <1>; #size-cells = <0>; }; -- 2.7.4