[PATCH v5 0/3] mmc: Adding support for Microchip Sparx5 SoC

[PATCH v5 0/3] mmc: Adding support for Microchip Sparx5 SoC

[Lars Povlsen]

The patch adds eMMC support for Sparx5, by adding a driver for the SoC
SDHCI controller, DT configuration and DT binding documentation.

Changes in v5:
- DT+yaml: Change (mmc|sdhci)@600800000 to mmc0@600800000
- Add missing "static" attribute to probe function
- Drop MMC_SDHCI_IO_ACCESSORS, as it is not required (anymore)

Changes in v4:
- Disable clock if sdhci_add_host() fails
- Remove dev_err if sdhci_add_host() fails

Changes in v3:
- Add dt-bindings for property "microchip,clock-delay"
- Enforce "microchip,clock-delay" valid range in driver
- Removed a noisy pr_debug() in sdhci_sparx5_adma_write_desc()

Changes in v2:
- Changes in driver as per review comments
 - Drop debug code
 - Drop sysfs code
 - use usleep_range()
 - use mmc_hostname() in pr_debug()
 - Remove deactivated code
 - Minor cosmetics

Lars Povlsen (3):
  dt-bindings: mmc: Add Sparx5 SDHCI controller bindings
  sdhci: sparx5: Add Sparx5 SoC eMMC driver
  arm64: dts: sparx5: Add Sparx5 eMMC support

 .../mmc/microchip,dw-sparx5-sdhci.yaml        |  65 +++++
 arch/arm64/boot/dts/microchip/sparx5.dtsi     |  24 ++
 .../boot/dts/microchip/sparx5_pcb125.dts      |  23 ++
 .../boot/dts/microchip/sparx5_pcb134_emmc.dts |  23 ++
 .../boot/dts/microchip/sparx5_pcb135_emmc.dts |  23 ++
 drivers/mmc/host/Kconfig                      |  12 +
 drivers/mmc/host/Makefile                     |   1 +
 drivers/mmc/host/sdhci-of-sparx5.c            | 269 ++++++++++++++++++
 8 files changed, 440 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
 create mode 100644 drivers/mmc/host/sdhci-of-sparx5.c

-- 
2.27.0

[PATCH v5 1/3] dt-bindings: mmc: Add Sparx5 SDHCI controller bindings

[Lars Povlsen]

The Sparx5 SDHCI controller is based on the Designware controller IP.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
---
 .../mmc/microchip,dw-sparx5-sdhci.yaml        | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml

diff --git a/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
new file mode 100644
index 000000000000..c9a572863b88
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/microchip,dw-sparx5-sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip Sparx5 Mobile Storage Host Controller Binding
+
+allOf:
+  - $ref: "mmc-controller.yaml"
+
+maintainers:
+  - Lars Povlsen <lars.povlsen@microchip.com>
+
+# Everything else is described in the common file
+properties:
+  compatible:
+    const: microchip,dw-sparx5-sdhci
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+    description:
+      Handle to "core" clock for the sdhci controller.
+
+  clock-names:
+    items:
+      - const: core
+
+  microchip,clock-delay:
+    description: Delay clock to card to meet setup time requirements.
+      Each step increase by 1.25ns.
+    $ref: "/schemas/types.yaml#/definitions/uint32"
+    minimum: 1
+    maximum: 15
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/microchip,sparx5.h>
+    sdhci0: mmc0@600800000 {
+        compatible = "microchip,dw-sparx5-sdhci";
+        reg = <0x00800000 0x1000>;
+        pinctrl-0 = <&emmc_pins>;
+        pinctrl-names = "default";
+        clocks = <&clks CLK_ID_AUX1>;
+        clock-names = "core";
+        assigned-clocks = <&clks CLK_ID_AUX1>;
+        assigned-clock-rates = <800000000>;
+        interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+        bus-width = <8>;
+        microchip,clock-delay = <10>;
+    };
-- 
2.27.0

[PATCH v5 2/3] sdhci: sparx5: Add Sparx5 SoC eMMC driver

[Lars Povlsen]

This adds the eMMC driver for the Sparx5 SoC. It is based upon the
designware IP, but requires some extra initialization and quirks.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/Kconfig           |  12 ++
 drivers/mmc/host/Makefile          |   1 +
 drivers/mmc/host/sdhci-of-sparx5.c | 269 +++++++++++++++++++++++++++++
 3 files changed, 282 insertions(+)
 create mode 100644 drivers/mmc/host/sdhci-of-sparx5.c

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 9c89a5b780e8..14ab8c03e4b8 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -213,6 +213,18 @@ config MMC_SDHCI_OF_DWCMSHC
 	  If you have a controller with this interface, say Y or M here.
 	  If unsure, say N.
 
+config MMC_SDHCI_OF_SPARX5
+	tristate "SDHCI OF support for the MCHP Sparx5 SoC"
+	depends on MMC_SDHCI_PLTFM
+	depends on ARCH_SPARX5
+	help
+	  This selects the Secure Digital Host Controller Interface (SDHCI)
+	  found in the MCHP Sparx5 SoC.
+
+	  If you have a Sparx5 SoC with this interface, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_SDHCI_CADENCE
 	tristate "SDHCI support for the Cadence SD/SDIO/eMMC controller"
 	depends on MMC_SDHCI_PLTFM
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 4d5bcb0144a0..451c25fc2c69 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -94,6 +94,7 @@ obj-$(CONFIG_MMC_SDHCI_OF_AT91)		+= sdhci-of-at91.o
 obj-$(CONFIG_MMC_SDHCI_OF_ESDHC)	+= sdhci-of-esdhc.o
 obj-$(CONFIG_MMC_SDHCI_OF_HLWD)		+= sdhci-of-hlwd.o
 obj-$(CONFIG_MMC_SDHCI_OF_DWCMSHC)	+= sdhci-of-dwcmshc.o
+obj-$(CONFIG_MMC_SDHCI_OF_SPARX5)	+= sdhci-of-sparx5.o
 obj-$(CONFIG_MMC_SDHCI_BCM_KONA)	+= sdhci-bcm-kona.o
 obj-$(CONFIG_MMC_SDHCI_IPROC)		+= sdhci-iproc.o
 obj-$(CONFIG_MMC_SDHCI_MSM)		+= sdhci-msm.o
diff --git a/drivers/mmc/host/sdhci-of-sparx5.c b/drivers/mmc/host/sdhci-of-sparx5.c
new file mode 100644
index 000000000000..14b5dad6575a
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of-sparx5.c
@@ -0,0 +1,269 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/mmc/host/sdhci-of-sparx5.c
+ *
+ * MCHP Sparx5 SoC Secure Digital Host Controller Interface.
+ *
+ * Copyright (c) 2019 Microchip Inc.
+ *
+ * Author: Lars Povlsen <lars.povlsen@microchip.com>
+ */
+
+#include <linux/sizes.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/of_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/dma-mapping.h>
+
+#include "sdhci-pltfm.h"
+
+#define CPU_REGS_GENERAL_CTRL	(0x22 * 4)
+#define  MSHC_DLY_CC_MASK	GENMASK(16, 13)
+#define  MSHC_DLY_CC_SHIFT	13
+#define  MSHC_DLY_CC_MAX	15
+
+#define CPU_REGS_PROC_CTRL	(0x2C * 4)
+#define  ACP_CACHE_FORCE_ENA	BIT(4)
+#define  ACP_AWCACHE		BIT(3)
+#define  ACP_ARCACHE		BIT(2)
+#define  ACP_CACHE_MASK		(ACP_CACHE_FORCE_ENA|ACP_AWCACHE|ACP_ARCACHE)
+
+#define MSHC2_VERSION			0x500	/* Off 0x140, reg 0x0 */
+#define MSHC2_TYPE			0x504	/* Off 0x140, reg 0x1 */
+#define MSHC2_EMMC_CTRL			0x52c	/* Off 0x140, reg 0xB */
+#define  MSHC2_EMMC_CTRL_EMMC_RST_N	BIT(2)
+#define  MSHC2_EMMC_CTRL_IS_EMMC	BIT(0)
+
+struct sdhci_sparx5_data {
+	struct sdhci_host *host;
+	struct regmap *cpu_ctrl;
+	int delay_clock;
+};
+
+#define BOUNDARY_OK(addr, len) \
+	((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
+
+/*
+ * If DMA addr spans 128MB boundary, we split the DMA transfer into two
+ * so that each DMA transfer doesn't exceed the boundary.
+ */
+static void sdhci_sparx5_adma_write_desc(struct sdhci_host *host, void **desc,
+					  dma_addr_t addr, int len,
+					  unsigned int cmd)
+{
+	int tmplen, offset;
+
+	if (likely(!len || BOUNDARY_OK(addr, len))) {
+		sdhci_adma_write_desc(host, desc, addr, len, cmd);
+		return;
+	}
+
+	pr_debug("%s: write_desc: splitting dma len %d, offset 0x%0llx\n",
+		 mmc_hostname(host->mmc), len, addr);
+
+	offset = addr & (SZ_128M - 1);
+	tmplen = SZ_128M - offset;
+	sdhci_adma_write_desc(host, desc, addr, tmplen, cmd);
+
+	addr += tmplen;
+	len -= tmplen;
+	sdhci_adma_write_desc(host, desc, addr, len, cmd);
+}
+
+static void sparx5_set_cacheable(struct sdhci_host *host, u32 value)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
+
+	pr_debug("%s: Set Cacheable = 0x%x\n", mmc_hostname(host->mmc), value);
+
+	/* Update ACP caching attributes in HW */
+	regmap_update_bits(sdhci_sparx5->cpu_ctrl,
+			   CPU_REGS_PROC_CTRL, ACP_CACHE_MASK, value);
+}
+
+static void sparx5_set_delay(struct sdhci_host *host, u8 value)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_sparx5_data *sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
+
+	pr_debug("%s: Set DLY_CC = %u\n", mmc_hostname(host->mmc), value);
+
+	/* Update DLY_CC in HW */
+	regmap_update_bits(sdhci_sparx5->cpu_ctrl,
+			   CPU_REGS_GENERAL_CTRL,
+			   MSHC_DLY_CC_MASK,
+			   (value << MSHC_DLY_CC_SHIFT));
+}
+
+static void sdhci_sparx5_set_emmc(struct sdhci_host *host)
+{
+	if (!mmc_card_is_removable(host->mmc)) {
+		u8 value;
+
+		value = sdhci_readb(host, MSHC2_EMMC_CTRL);
+		if (!(value & MSHC2_EMMC_CTRL_IS_EMMC)) {
+			value |= MSHC2_EMMC_CTRL_IS_EMMC;
+			pr_debug("%s: Set EMMC_CTRL: 0x%08x\n",
+				 mmc_hostname(host->mmc), value);
+			sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
+		}
+	}
+}
+
+static void sdhci_sparx5_reset_emmc(struct sdhci_host *host)
+{
+	u8 value;
+
+	pr_debug("%s: Toggle EMMC_CTRL.EMMC_RST_N\n", mmc_hostname(host->mmc));
+	value = sdhci_readb(host, MSHC2_EMMC_CTRL) &
+		~MSHC2_EMMC_CTRL_EMMC_RST_N;
+	sdhci_writeb(host, value, MSHC2_EMMC_CTRL);
+	/* For eMMC, minimum is 1us but give it 10us for good measure */
+	usleep_range(10, 20);
+	sdhci_writeb(host, value | MSHC2_EMMC_CTRL_EMMC_RST_N,
+		     MSHC2_EMMC_CTRL);
+	/* For eMMC, minimum is 200us but give it 300us for good measure */
+	usleep_range(300, 400);
+}
+
+static void sdhci_sparx5_reset(struct sdhci_host *host, u8 mask)
+{
+	pr_debug("%s: *** RESET: mask %d\n", mmc_hostname(host->mmc), mask);
+
+	sdhci_reset(host, mask);
+
+	/* Be sure CARD_IS_EMMC stays set */
+	sdhci_sparx5_set_emmc(host);
+}
+
+static const struct sdhci_ops sdhci_sparx5_ops = {
+	.set_clock		= sdhci_set_clock,
+	.set_bus_width		= sdhci_set_bus_width,
+	.set_uhs_signaling	= sdhci_set_uhs_signaling,
+	.get_max_clock		= sdhci_pltfm_clk_get_max_clock,
+	.reset			= sdhci_sparx5_reset,
+	.adma_write_desc	= sdhci_sparx5_adma_write_desc,
+};
+
+static const struct sdhci_pltfm_data sdhci_sparx5_pdata = {
+	.quirks  = 0,
+	.quirks2 = SDHCI_QUIRK2_HOST_NO_CMD23 | /* Controller issue */
+		   SDHCI_QUIRK2_NO_1_8_V, /* No sdr104, ddr50, etc */
+	.ops = &sdhci_sparx5_ops,
+};
+
+static int sdhci_sparx5_probe(struct platform_device *pdev)
+{
+	int ret;
+	const char *syscon = "microchip,sparx5-cpu-syscon";
+	struct sdhci_host *host;
+	struct sdhci_pltfm_host *pltfm_host;
+	struct sdhci_sparx5_data *sdhci_sparx5;
+	struct device_node *np = pdev->dev.of_node;
+	u32 value;
+	u32 extra;
+
+	host = sdhci_pltfm_init(pdev, &sdhci_sparx5_pdata,
+				sizeof(*sdhci_sparx5));
+
+	if (IS_ERR(host))
+		return PTR_ERR(host);
+
+	/*
+	 * extra adma table cnt for cross 128M boundary handling.
+	 */
+	extra = DIV_ROUND_UP_ULL(dma_get_required_mask(&pdev->dev), SZ_128M);
+	if (extra > SDHCI_MAX_SEGS)
+		extra = SDHCI_MAX_SEGS;
+	host->adma_table_cnt += extra;
+
+	pltfm_host = sdhci_priv(host);
+	sdhci_sparx5 = sdhci_pltfm_priv(pltfm_host);
+	sdhci_sparx5->host = host;
+
+	pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
+	if (IS_ERR(pltfm_host->clk)) {
+		ret = PTR_ERR(pltfm_host->clk);
+		dev_err(&pdev->dev, "failed to get core clk: %d\n", ret);
+		goto free_pltfm;
+	}
+	ret = clk_prepare_enable(pltfm_host->clk);
+	if (ret)
+		goto free_pltfm;
+
+	if (!of_property_read_u32(np, "microchip,clock-delay", &value) &&
+	    (value > 0 && value <= MSHC_DLY_CC_MAX))
+		sdhci_sparx5->delay_clock = value;
+
+	sdhci_get_of_property(pdev);
+
+	ret = mmc_of_parse(host->mmc);
+	if (ret)
+		goto err_clk;
+
+	sdhci_sparx5->cpu_ctrl = syscon_regmap_lookup_by_compatible(syscon);
+	if (IS_ERR(sdhci_sparx5->cpu_ctrl)) {
+		dev_err(&pdev->dev, "No CPU syscon regmap !\n");
+		ret = PTR_ERR(sdhci_sparx5->cpu_ctrl);
+		goto err_clk;
+	}
+
+	if (sdhci_sparx5->delay_clock >= 0)
+		sparx5_set_delay(host, sdhci_sparx5->delay_clock);
+
+	if (!mmc_card_is_removable(host->mmc)) {
+		/* Do a HW reset of eMMC card */
+		sdhci_sparx5_reset_emmc(host);
+		/* Update EMMC_CTRL */
+		sdhci_sparx5_set_emmc(host);
+		/* If eMMC, disable SD and SDIO */
+		host->mmc->caps2 |= (MMC_CAP2_NO_SDIO|MMC_CAP2_NO_SD);
+	}
+
+	ret = sdhci_add_host(host);
+	if (ret)
+		goto err_clk;
+
+	/* Set AXI bus master to use un-cached access (for DMA) */
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA) &&
+	    IS_ENABLED(CONFIG_DMA_DECLARE_COHERENT))
+		sparx5_set_cacheable(host, ACP_CACHE_FORCE_ENA);
+
+	pr_debug("%s: SDHC version: 0x%08x\n",
+		 mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_VERSION));
+	pr_debug("%s: SDHC type:    0x%08x\n",
+		 mmc_hostname(host->mmc), sdhci_readl(host, MSHC2_TYPE));
+
+	return ret;
+
+err_clk:
+	clk_disable_unprepare(pltfm_host->clk);
+free_pltfm:
+	sdhci_pltfm_free(pdev);
+	return ret;
+}
+
+static const struct of_device_id sdhci_sparx5_of_match[] = {
+	{ .compatible = "microchip,dw-sparx5-sdhci" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, sdhci_sparx5_of_match);
+
+static struct platform_driver sdhci_sparx5_driver = {
+	.driver = {
+		.name = "sdhci-sparx5",
+		.of_match_table = sdhci_sparx5_of_match,
+		.pm = &sdhci_pltfm_pmops,
+	},
+	.probe = sdhci_sparx5_probe,
+	.remove = sdhci_pltfm_unregister,
+};
+
+module_platform_driver(sdhci_sparx5_driver);
+
+MODULE_DESCRIPTION("Sparx5 SDHCI OF driver");
+MODULE_AUTHOR("Lars Povlsen <lars.povlsen@microchip.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.27.0

[PATCH v5 3/3] arm64: dts: sparx5: Add Sparx5 eMMC support

[Lars Povlsen]

This adds eMMC support to the applicable Sparx5 board configuration
files.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
---
 arch/arm64/boot/dts/microchip/sparx5.dtsi     | 24 +++++++++++++++++++
 .../boot/dts/microchip/sparx5_pcb125.dts      | 23 ++++++++++++++++++
 .../boot/dts/microchip/sparx5_pcb134_emmc.dts | 23 ++++++++++++++++++
 .../boot/dts/microchip/sparx5_pcb135_emmc.dts | 23 ++++++++++++++++++
 4 files changed, 93 insertions(+)

diff --git a/arch/arm64/boot/dts/microchip/sparx5.dtsi b/arch/arm64/boot/dts/microchip/sparx5.dtsi
index cf712e80615d..a79c5bb10ab2 100644
--- a/arch/arm64/boot/dts/microchip/sparx5.dtsi
+++ b/arch/arm64/boot/dts/microchip/sparx5.dtsi
@@ -5,6 +5,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/clock/microchip,sparx5.h>
 
 / {
 	compatible = "microchip,sparx5";
@@ -151,6 +152,20 @@ timer1: timer@600105000 {
 			interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
+		sdhci0: mmc0@600800000 {
+			compatible = "microchip,dw-sparx5-sdhci";
+			status = "disabled";
+			reg = <0x6 0x00800000 0x1000>;
+			pinctrl-0 = <&emmc_pins>;
+			pinctrl-names = "default";
+			clocks = <&clks CLK_ID_AUX1>;
+			clock-names = "core";
+			assigned-clocks = <&clks CLK_ID_AUX1>;
+			assigned-clock-rates = <800000000>;
+			interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+			bus-width = <8>;
+		};
+
 		gpio: pinctrl@6110101e0 {
 			compatible = "microchip,sparx5-pinctrl";
 			reg = <0x6 0x110101e0 0x90>, <0x6 0x10508010 0x100>;
@@ -180,6 +195,15 @@ i2c2_pins: i2c2-pins {
 				pins = "GPIO_28", "GPIO_29";
 				function = "twi2";
 			};
+
+			emmc_pins: emmc-pins {
+				pins = "GPIO_34", "GPIO_35", "GPIO_36",
+					"GPIO_37", "GPIO_38", "GPIO_39",
+					"GPIO_40", "GPIO_41", "GPIO_42",
+					"GPIO_43", "GPIO_44", "GPIO_45",
+					"GPIO_46", "GPIO_47";
+				function = "emmc";
+			};
 		};
 
 		i2c0: i2c@600101000 {
diff --git a/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts b/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts
index 91ee5b6cfc37..573309fe4582 100644
--- a/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts
+++ b/arch/arm64/boot/dts/microchip/sparx5_pcb125.dts
@@ -16,6 +16,29 @@ memory@0 {
 	};
 };
 
+&gpio {
+	emmc_pins: emmc-pins {
+		/* NB: No "GPIO_35", "GPIO_36", "GPIO_37"
+		 * (N/A: CARD_nDETECT, CARD_WP, CARD_LED)
+		 */
+		pins = "GPIO_34", "GPIO_38", "GPIO_39",
+			"GPIO_40", "GPIO_41", "GPIO_42",
+			"GPIO_43", "GPIO_44", "GPIO_45",
+			"GPIO_46", "GPIO_47";
+		drive-strength = <3>;
+		function = "emmc";
+	};
+};
+
+&sdhci0 {
+	status = "okay";
+	bus-width = <8>;
+	non-removable;
+	pinctrl-0 = <&emmc_pins>;
+	max-frequency = <8000000>;
+	microchip,clock-delay = <10>;
+};
+
 &i2c1 {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts b/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts
index 10081a66961b..bbb9852c1f15 100644
--- a/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts
+++ b/arch/arm64/boot/dts/microchip/sparx5_pcb134_emmc.dts
@@ -15,3 +15,26 @@ memory@0 {
 		reg = <0x00000000 0x00000000 0x10000000>;
 	};
 };
+
+&gpio {
+	emmc_pins: emmc-pins {
+		/* NB: No "GPIO_35", "GPIO_36", "GPIO_37"
+		 * (N/A: CARD_nDETECT, CARD_WP, CARD_LED)
+		 */
+		pins = "GPIO_34", "GPIO_38", "GPIO_39",
+			"GPIO_40", "GPIO_41", "GPIO_42",
+			"GPIO_43", "GPIO_44", "GPIO_45",
+			"GPIO_46", "GPIO_47";
+		drive-strength = <3>;
+		function = "emmc";
+	};
+};
+
+&sdhci0 {
+	status = "okay";
+	pinctrl-0 = <&emmc_pins>;
+	non-removable;
+	max-frequency = <52000000>;
+	bus-width = <8>;
+	microchip,clock-delay = <10>;
+};
diff --git a/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts b/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts
index 741f0e12260e..f82266fe2ad4 100644
--- a/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts
+++ b/arch/arm64/boot/dts/microchip/sparx5_pcb135_emmc.dts
@@ -15,3 +15,26 @@ memory@0 {
 		reg = <0x00000000 0x00000000 0x10000000>;
 	};
 };
+
+&gpio {
+	emmc_pins: emmc-pins {
+		/* NB: No "GPIO_35", "GPIO_36", "GPIO_37"
+		 * (N/A: CARD_nDETECT, CARD_WP, CARD_LED)
+		 */
+		pins = "GPIO_34", "GPIO_38", "GPIO_39",
+			"GPIO_40", "GPIO_41", "GPIO_42",
+			"GPIO_43", "GPIO_44", "GPIO_45",
+			"GPIO_46", "GPIO_47";
+		drive-strength = <3>;
+		function = "emmc";
+	};
+};
+
+&sdhci0 {
+	status = "okay";
+	pinctrl-0 = <&emmc_pins>;
+	non-removable;
+	max-frequency = <52000000>;
+	bus-width = <8>;
+	microchip,clock-delay = <10>;
+};
-- 
2.27.0

Re: [PATCH v5 0/3] mmc: Adding support for Microchip Sparx5 SoC

[Ulf Hansson]

On Tue, 25 Aug 2020 at 10:14, Lars Povlsen <lars.povlsen@microchip.com> wrote:
>
> The patch adds eMMC support for Sparx5, by adding a driver for the SoC
> SDHCI controller, DT configuration and DT binding documentation.
>
> Changes in v5:
> - DT+yaml: Change (mmc|sdhci)@600800000 to mmc0@600800000
> - Add missing "static" attribute to probe function
> - Drop MMC_SDHCI_IO_ACCESSORS, as it is not required (anymore)
>
> Changes in v4:
> - Disable clock if sdhci_add_host() fails
> - Remove dev_err if sdhci_add_host() fails
>
> Changes in v3:
> - Add dt-bindings for property "microchip,clock-delay"
> - Enforce "microchip,clock-delay" valid range in driver
> - Removed a noisy pr_debug() in sdhci_sparx5_adma_write_desc()
>
> Changes in v2:
> - Changes in driver as per review comments
>  - Drop debug code
>  - Drop sysfs code
>  - use usleep_range()
>  - use mmc_hostname() in pr_debug()
>  - Remove deactivated code
>  - Minor cosmetics
>
> Lars Povlsen (3):
>   dt-bindings: mmc: Add Sparx5 SDHCI controller bindings
>   sdhci: sparx5: Add Sparx5 SoC eMMC driver
>   arm64: dts: sparx5: Add Sparx5 eMMC support
>
>  .../mmc/microchip,dw-sparx5-sdhci.yaml        |  65 +++++
>  arch/arm64/boot/dts/microchip/sparx5.dtsi     |  24 ++
>  .../boot/dts/microchip/sparx5_pcb125.dts      |  23 ++
>  .../boot/dts/microchip/sparx5_pcb134_emmc.dts |  23 ++
>  .../boot/dts/microchip/sparx5_pcb135_emmc.dts |  23 ++
>  drivers/mmc/host/Kconfig                      |  12 +
>  drivers/mmc/host/Makefile                     |   1 +
>  drivers/mmc/host/sdhci-of-sparx5.c            | 269 ++++++++++++++++++
>  8 files changed, 440 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
>  create mode 100644 drivers/mmc/host/sdhci-of-sparx5.c
>

For some reason, patchwork doesn't seem to accept your patches. Can
you please have a look to figure it out, at least until next time.

In this case, I picked them from the emails, so patch 1 and patch2
applied for next, thanks!

Kind regards
Uffe

Re: [PATCH v5 1/3] dt-bindings: mmc: Add Sparx5 SDHCI controller bindings

[Rob Herring]

On Tue, 25 Aug 2020 10:13:55 +0200, Lars Povlsen wrote:
> The Sparx5 SDHCI controller is based on the Designware controller IP.
> 
> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
> ---
>  .../mmc/microchip,dw-sparx5-sdhci.yaml        | 65 +++++++++++++++++++
>  1 file changed, 65 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml
> 


My bot found errors running 'make dt_binding_check' on your patch:

/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.example.dt.yaml: mmc0@600800000: $nodename:0: 'mmc0@600800000' does not match '^mmc(@.*)?$'
	From schema: /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/mmc/microchip,dw-sparx5-sdhci.yaml


See https://patchwork.ozlabs.org/patch/1350851

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure dt-schema is up to date:

pip3 install git+https://github.com/devicetree-org/dt-schema.git@master --upgrade

Please check and re-submit.