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81 lines
2.6 KiB
Diff
81 lines
2.6 KiB
Diff
From a0adae0d3e1327dfa796986e45bbe20dee335f2c Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 8 Sep 2015 15:14:50 +0100
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Subject: [PATCH 177/203] BCM270X_DT: Add SDIO overlay
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Enable SDIO from MMC interface via GPIOs 22-27. Includes the sdhost
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overlay to free up the MMC interface.
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 15 +++++++++++++++
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arch/arm/boot/dts/overlays/sdio-overlay.dts | 29 +++++++++++++++++++++++++++++
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3 files changed, 45 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/sdio-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -44,6 +44,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-ft5406-ove
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dtb-$(RPI_DT_OVERLAYS) += rpi-proto-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += rpi-sense-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += sdio-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += spi-bcm2708-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += spi-bcm2835-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += spi-dma-overlay.dtb
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -513,6 +513,21 @@ Params: overclock_50 Clock (
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debug Enable debug output (default off)
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+Name: sdio
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+Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,
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+ and enables SDIO via GPIOs 22-27.
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+Load: dtoverlay=sdio,<param>=<val>
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+Params: overclock_50 Clock (in MHz) to use when the MMC framework
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+ requests 50MHz
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+
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+ force_pio Disable DMA support (default off)
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+
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+ pio_limit Number of blocks above which to use DMA
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+ (default 1)
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+
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+ debug Enable debug output (default off)
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+
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+
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Name: spi-bcm2708
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Info: Selects the bcm2708-spi SPI driver
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Load: dtoverlay=spi-bcm2708
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/sdio-overlay.dts
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@@ -0,0 +1,29 @@
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+/* Enable SDIO from MMC interface via GPIOs 22-27. Includes sdhost overlay. */
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+
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+/include/ "sdhost-overlay.dts"
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@3 {
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+ target = <&mmc>;
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+ __overlay__ {
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+ compatible = "brcm,bcm2835-mmc";
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&sdio_pins>;
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+ non-removable;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@4 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ sdio_pins: sdio_pins {
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+ brcm,pins = <22 23 24 25 26 27>;
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+ brcm,function = <7 7 7 7 7 7>; /* ALT3 = SD1 */
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+ brcm,pull = <0 2 2 2 2 2>;
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+ };
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+ };
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+ };
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+};
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