[PATCH v2 0/2] mmc: Add support for the ASPEED SD controller

[PATCH v2 0/2] mmc: Add support for the ASPEED SD controller

[Andrew Jeffery]

Hello,

This is v2 of the ASPEED SD controller driver. v2 primarily addresses Rob's
comments on the bindings in v1. The v1 series can be found here:

https://lists.ozlabs.org/pipermail/linux-aspeed/2019-July/001988.html

Please review!

Andrew

Andrew Jeffery (2):
  dt-bindings: mmc: Document Aspeed SD controller
  mmc: Add support for the ASPEED SD controller

 .../devicetree/bindings/mmc/aspeed,sdhci.yaml |  90 +++++
 drivers/mmc/host/Kconfig                      |  12 +
 drivers/mmc/host/Makefile                     |   1 +
 drivers/mmc/host/sdhci-of-aspeed.c            | 326 ++++++++++++++++++
 4 files changed, 429 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
 create mode 100644 drivers/mmc/host/sdhci-of-aspeed.c

-- 
2.20.1


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[PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Andrew Jeffery]

The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
data bus if only a single slot is enabled.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
---
In v2:

* Rename to aspeed,sdhci.yaml
* Rename sd-controller compatible
* Add `maxItems: 1` for reg properties
* Move sdhci subnode description to patternProperties
* Drop sdhci compatible requirement
* #address-cells and #size-cells are required
* Prevent additional properties
* Implement explicit ranges in example
* Remove slot property

 .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml

diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
new file mode 100644
index 000000000000..67a691c3348c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
@@ -0,0 +1,90 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ASPEED SD/SDIO/eMMC Controller
+
+maintainers:
+  - Andrew Jeffery <andrew@aj.id.au>
+  - Ryan Chen <ryanchen.aspeed@gmail.com>
+
+description: |+
+  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
+  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
+  only a single slot is enabled.
+
+  The two slots are supported by a common configuration area. As the SDHCIs for
+  the slots are dependent on the common configuration area, they are described
+  as child nodes.
+
+properties:
+  compatible:
+    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
+  reg:
+    maxItems: 1
+    description: Common configuration registers
+  ranges: true
+  clocks:
+    maxItems: 1
+    description: The SD/SDIO controller clock gate
+
+patternProperties:
+  "^sdhci@[0-9a-f]+$":
+    type: object
+    properties:
+      compatible:
+        enum: [ aspeed,ast2400-sdhci, aspeed,ast2500-sdhci ]
+      reg:
+        maxItems: 1
+        description: The SDHCI registers
+      clocks:
+        maxItems: 1
+        description: The SD bus clock
+      interrupts:
+        maxItems: 1
+        description: The SD interrupt shared between both slots
+    required:
+      - compatible
+      - reg
+      - clocks
+      - interrupts
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - ranges
+  - clocks
+
+examples:
+  - |
+    #include <dt-bindings/clock/aspeed-clock.h>
+    sdc@1e740000 {
+            compatible = "aspeed,ast2500-sd-controller";
+            reg = <0x1e740000 0x100>;
+            #address-cells = <1>;
+            #size-cells = <1>;
+            ranges = <0 0x1e740000 0x10000>;
+            clocks = <&syscon ASPEED_CLK_GATE_SDCLK>;
+
+            sdhci0: sdhci@100 {
+                    compatible = "aspeed,ast2500-sdhci";
+                    reg = <0x100 0x100>;
+                    interrupts = <26>;
+                    sdhci,auto-cmd12;
+                    clocks = <&syscon ASPEED_CLK_SDIO>;
+            };
+
+            sdhci1: sdhci@200 {
+                    compatible = "aspeed,ast2500-sdhci";
+                    reg = <0x200 0x100>;
+                    interrupts = <26>;
+                    sdhci,auto-cmd12;
+                    clocks = <&syscon ASPEED_CLK_SDIO>;
+            };
+    };
-- 
2.20.1


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[PATCH v2 2/2] mmc: Add support for the ASPEED SD controller

[Andrew Jeffery]

Add a minimal driver for ASPEED's SD controller, which exposes two
SDHCIs.

The ASPEED design implements a common register set for the SDHCIs, and
moves some of the standard configuration elements out to this common
area (e.g. 8-bit mode, and card detect configuration which is not
currently supported).

The SD controller has a dedicated hardware interrupt that is shared
between the slots. The common register set exposes information on which
slot triggered the interrupt; early revisions of the patch introduced an
irqchip for the register, but reality is it doesn't behave as an
irqchip, and the result fits awkwardly into the irqchip APIs. Instead
I've taken the simple approach of using the IRQ as a shared IRQ with
some minor performance impact for the second slot.

Ryan was the original author of the patch - I've taken his work and
massaged it to drop the irqchip support and rework the devicetree
integration. The driver has been smoke tested under qemu against a
minimal SD controller model and lightly tested on an ast2500-evb.

Signed-off-by: Ryan Chen <ryanchen.aspeed@gmail.com>
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
---
In v2:

* Drop unnecesasry MODULE_DEVICE_TABLE()
* Rename sd-controller compatible
* Add IBM copyright
* Drop unnecesary data assignment in of match table entries
* Derive the slot from the SDHCI offset

 drivers/mmc/host/Kconfig           |  12 ++
 drivers/mmc/host/Makefile          |   1 +
 drivers/mmc/host/sdhci-of-aspeed.c | 326 +++++++++++++++++++++++++++++
 3 files changed, 339 insertions(+)
 create mode 100644 drivers/mmc/host/sdhci-of-aspeed.c

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 931770f17087..2bb5e1264b3d 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -154,6 +154,18 @@ config MMC_SDHCI_OF_ARASAN
 
 	  If unsure, say N.
 
+config MMC_SDHCI_OF_ASPEED
+	tristate "SDHCI OF support for the ASPEED SDHCI controller"
+	depends on MMC_SDHCI_PLTFM
+	depends on OF
+	help
+	  This selects the ASPEED Secure Digital Host Controller Interface.
+
+	  If you have a controller with this interface, say Y or M here. You
+	  also need to enable an appropriate bus interface.
+
+	  If unsure, say N.
+
 config MMC_SDHCI_OF_AT91
 	tristate "SDHCI OF support for the Atmel SDMMC controller"
 	depends on MMC_SDHCI_PLTFM
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 73578718f119..390ee162fe71 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_MMC_SDHCI_ESDHC_IMX)	+= sdhci-esdhc-imx.o
 obj-$(CONFIG_MMC_SDHCI_DOVE)		+= sdhci-dove.o
 obj-$(CONFIG_MMC_SDHCI_TEGRA)		+= sdhci-tegra.o
 obj-$(CONFIG_MMC_SDHCI_OF_ARASAN)	+= sdhci-of-arasan.o
+obj-$(CONFIG_MMC_SDHCI_OF_ASPEED)	+= sdhci-of-aspeed.o
 obj-$(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
diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
new file mode 100644
index 000000000000..9528e43c257d
--- /dev/null
+++ b/drivers/mmc/host/sdhci-of-aspeed.c
@@ -0,0 +1,326 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (C) 2019 ASPEED Technology Inc. */
+/* Copyright (C) 2019 IBM Corp. */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#include "sdhci-pltfm.h"
+
+#define ASPEED_SDC_INFO		0x00
+#define   ASPEED_SDC_S1MMC8	BIT(25)
+#define   ASPEED_SDC_S0MMC8	BIT(24)
+
+struct aspeed_sdc {
+	struct clk *clk;
+	struct resource *res;
+
+	spinlock_t lock;
+	void __iomem *regs;
+};
+
+struct aspeed_sdhci {
+	struct aspeed_sdc *parent;
+	u32 width_mask;
+};
+
+static void aspeed_sdc_bus_width(struct aspeed_sdc *sdc,
+				 struct aspeed_sdhci *sdhci, bool bus8)
+{
+	u32 info;
+
+	/* Set/clear 8 bit mode */
+	spin_lock(&sdc->lock);
+	info = readl(sdc->regs + ASPEED_SDC_INFO);
+	if (bus8)
+		info |= sdhci->width_mask;
+	else
+		info &= ~sdhci->width_mask;
+	writel(info, sdc->regs + ASPEED_SDC_INFO);
+	spin_unlock(&sdc->lock);
+}
+
+static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+	unsigned long timeout;
+	int div;
+	u16 clk;
+
+	if (clock == host->clock)
+		return;
+
+	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+
+	if (clock == 0)
+		goto out;
+
+	for (div = 1; div < 256; div *= 2) {
+		if ((host->max_clk / div) <= clock)
+			break;
+	}
+	div >>= 1;
+
+	clk = div << SDHCI_DIVIDER_SHIFT;
+	clk |= SDHCI_CLOCK_INT_EN;
+	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+	/* Wait max 20 ms */
+	timeout = 20;
+	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
+		 & SDHCI_CLOCK_INT_STABLE)) {
+		if (timeout == 0) {
+			pr_err("%s: Internal clock never stabilised.\n",
+			       mmc_hostname(host->mmc));
+			return;
+		}
+		timeout--;
+		mdelay(1);
+	}
+
+	clk |= SDHCI_CLOCK_CARD_EN;
+	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+out:
+	host->clock = clock;
+}
+
+static void aspeed_sdhci_set_bus_width(struct sdhci_host *host, int width)
+{
+	struct sdhci_pltfm_host *pltfm_priv;
+	struct aspeed_sdhci *aspeed_sdhci;
+	struct aspeed_sdc *aspeed_sdc;
+	u8 ctrl;
+
+	pltfm_priv = sdhci_priv(host);
+	aspeed_sdhci = sdhci_pltfm_priv(pltfm_priv);
+	aspeed_sdc = aspeed_sdhci->parent;
+
+	/* Set/clear 8-bit mode */
+	aspeed_sdc_bus_width(aspeed_sdc, aspeed_sdhci,
+			     width == MMC_BUS_WIDTH_8);
+
+	/* Set/clear 1 or 4 bit mode */
+	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+	if (width == MMC_BUS_WIDTH_4)
+		ctrl |= SDHCI_CTRL_4BITBUS;
+	else
+		ctrl &= ~SDHCI_CTRL_4BITBUS;
+	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+}
+
+static const struct sdhci_ops aspeed_sdhci_ops = {
+	.set_clock = aspeed_sdhci_set_clock,
+	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
+	.set_bus_width = aspeed_sdhci_set_bus_width,
+	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
+	.reset = sdhci_reset,
+	.set_uhs_signaling = sdhci_set_uhs_signaling,
+};
+
+static const struct sdhci_pltfm_data aspeed_sdc_pdata = {
+	.ops = &aspeed_sdhci_ops,
+	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
+	.quirks2 = SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
+};
+
+static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev,
+					      struct resource *res)
+{
+	resource_size_t delta;
+
+	if (!res || resource_type(res) != IORESOURCE_MEM)
+		return -EINVAL;
+
+	if (res->start < dev->parent->res->start)
+		return -EINVAL;
+
+	delta = res->start - dev->parent->res->start;
+	if (delta & (0x100 - 1))
+		return -EINVAL;
+
+	return (delta / 0x100) - 1;
+}
+
+static int aspeed_sdhci_probe(struct platform_device *pdev)
+{
+	struct sdhci_pltfm_host *pltfm_host;
+	struct aspeed_sdhci *dev;
+	struct sdhci_host *host;
+	struct resource *res;
+	int slot;
+	int ret;
+
+	host = sdhci_pltfm_init(pdev, &aspeed_sdc_pdata, sizeof(*dev));
+	if (IS_ERR(host))
+		return PTR_ERR(host);
+
+	pltfm_host = sdhci_priv(host);
+	dev = sdhci_pltfm_priv(pltfm_host);
+	dev->parent = dev_get_drvdata(pdev->dev.parent);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	slot = aspeed_sdhci_calculate_slot(dev, res);
+	if (slot < 0)
+		return slot;
+	dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
+	dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;
+
+	sdhci_get_of_property(pdev);
+
+	pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(pltfm_host->clk))
+		return PTR_ERR(pltfm_host->clk);
+
+	ret = clk_prepare_enable(pltfm_host->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Unable to enable SDIO clock\n");
+		goto err_pltfm_free;
+	}
+
+	ret = mmc_of_parse(host->mmc);
+	if (ret)
+		goto err_sdhci_add;
+
+	ret = sdhci_add_host(host);
+	if (ret)
+		goto err_sdhci_add;
+
+	return 0;
+
+err_sdhci_add:
+	clk_disable_unprepare(pltfm_host->clk);
+err_pltfm_free:
+	sdhci_pltfm_free(pdev);
+	return ret;
+}
+
+static int aspeed_sdhci_remove(struct platform_device *pdev)
+{
+	struct sdhci_pltfm_host *pltfm_host;
+	struct sdhci_host *host;
+	int dead;
+
+	host = platform_get_drvdata(pdev);
+	pltfm_host = sdhci_priv(host);
+
+	dead = readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff;
+
+	sdhci_remove_host(host, dead);
+
+	clk_disable_unprepare(pltfm_host->clk);
+
+	sdhci_pltfm_free(pdev);
+
+	return 0;
+}
+
+static const struct of_device_id aspeed_sdhci_of_match[] = {
+	{ .compatible = "aspeed,ast2400-sdhci", },
+	{ .compatible = "aspeed,ast2500-sdhci", },
+	{ }
+};
+
+static struct platform_driver aspeed_sdhci_driver = {
+	.driver		= {
+		.name	= "sdhci-aspeed",
+		.of_match_table = aspeed_sdhci_of_match,
+	},
+	.probe		= aspeed_sdhci_probe,
+	.remove		= aspeed_sdhci_remove,
+};
+
+module_platform_driver(aspeed_sdhci_driver);
+
+static int aspeed_sdc_probe(struct platform_device *pdev)
+
+{
+	struct device_node *parent, *child;
+	struct aspeed_sdc *sdc;
+	int ret;
+
+	sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
+	if (!sdc)
+		return -ENOMEM;
+
+	spin_lock_init(&sdc->lock);
+
+	sdc->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(sdc->clk))
+		return PTR_ERR(sdc->clk);
+
+	ret = clk_prepare_enable(sdc->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Unable to enable SDCLK\n");
+		return ret;
+	}
+
+	sdc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	sdc->regs = devm_ioremap_resource(&pdev->dev, sdc->res);
+	if (IS_ERR(sdc->regs)) {
+		ret = PTR_ERR(sdc->regs);
+		goto err_clk;
+	}
+
+	dev_set_drvdata(&pdev->dev, sdc);
+
+	parent = pdev->dev.of_node;
+	for_each_available_child_of_node(parent, child) {
+		struct platform_device *cpdev;
+
+		cpdev = of_platform_device_create(child, NULL, &pdev->dev);
+		if (IS_ERR(cpdev)) {
+			of_node_put(child);
+			ret = PTR_ERR(pdev);
+			goto err_clk;
+		}
+	}
+
+	return 0;
+
+err_clk:
+	clk_disable_unprepare(sdc->clk);
+	return ret;
+}
+
+static int aspeed_sdc_remove(struct platform_device *pdev)
+{
+	struct aspeed_sdc *sdc = dev_get_drvdata(&pdev->dev);
+
+	clk_disable_unprepare(sdc->clk);
+
+	return 0;
+}
+
+static const struct of_device_id aspeed_sdc_of_match[] = {
+	{ .compatible = "aspeed,ast2400-sd-controller", },
+	{ .compatible = "aspeed,ast2500-sd-controller", },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(of, aspeed_sdc_of_match);
+
+static struct platform_driver aspeed_sdc_driver = {
+	.driver		= {
+		.name	= "sd-controller-aspeed",
+		.pm	= &sdhci_pltfm_pmops,
+		.of_match_table = aspeed_sdc_of_match,
+	},
+	.probe		= aspeed_sdc_probe,
+	.remove		= aspeed_sdc_remove,
+};
+
+module_platform_driver(aspeed_sdc_driver);
+
+MODULE_DESCRIPTION("Driver for the ASPEED SD/SDIO/SDHCI Controllers");
+MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>");
+MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
+MODULE_LICENSE("GPL v2");
-- 
2.20.1


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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Rob Herring]

On Thu, Jul 11, 2019 at 9:32 PM Andrew Jeffery <andrew@aj.id.au> wrote:
>
> The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> data bus if only a single slot is enabled.
>
> Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> ---
> In v2:
>
> * Rename to aspeed,sdhci.yaml
> * Rename sd-controller compatible
> * Add `maxItems: 1` for reg properties
> * Move sdhci subnode description to patternProperties
> * Drop sdhci compatible requirement
> * #address-cells and #size-cells are required
> * Prevent additional properties
> * Implement explicit ranges in example
> * Remove slot property
>
>  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml

Reviewed-by: Rob Herring <robh@kernel.org>

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Maxime Ripard]

[-- Attachment #1.1: Type: text/plain, Size: 3428 bytes --]

Hi,

On Fri, Jul 12, 2019 at 01:02:13PM +0930, Andrew Jeffery wrote:
> The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> data bus if only a single slot is enabled.
>
> Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> ---
> In v2:
>
> * Rename to aspeed,sdhci.yaml
> * Rename sd-controller compatible
> * Add `maxItems: 1` for reg properties
> * Move sdhci subnode description to patternProperties
> * Drop sdhci compatible requirement
> * #address-cells and #size-cells are required
> * Prevent additional properties
> * Implement explicit ranges in example
> * Remove slot property
>
>  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
>
> diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> new file mode 100644
> index 000000000000..67a691c3348c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED SD/SDIO/eMMC Controller
> +
> +maintainers:
> +  - Andrew Jeffery <andrew@aj.id.au>
> +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> +
> +description: |+
> +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> +  only a single slot is enabled.
> +
> +  The two slots are supported by a common configuration area. As the SDHCIs for
> +  the slots are dependent on the common configuration area, they are described
> +  as child nodes.
> +
> +properties:
> +  compatible:
> +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> +  reg:
> +    maxItems: 1
> +    description: Common configuration registers
> +  ranges: true
> +  clocks:
> +    maxItems: 1
> +    description: The SD/SDIO controller clock gate

#address-cells and #size-cells have not been described here.

> +patternProperties:
> +  "^sdhci@[0-9a-f]+$":
> +    type: object
> +    properties:
> +      compatible:
> +        enum: [ aspeed,ast2400-sdhci, aspeed,ast2500-sdhci ]
> +      reg:
> +        maxItems: 1
> +        description: The SDHCI registers
> +      clocks:
> +        maxItems: 1
> +        description: The SD bus clock
> +      interrupts:
> +        maxItems: 1
> +        description: The SD interrupt shared between both slots
> +    required:
> +      - compatible
> +      - reg
> +      - clocks
> +      - interrupts
> +
> +additionalProperties: false

But that means that it will generate a warning in your DT if you ever
use them.

> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +  - clocks
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/aspeed-clock.h>
> +    sdc@1e740000 {
> +            compatible = "aspeed,ast2500-sd-controller";
> +            reg = <0x1e740000 0x100>;
> +            #address-cells = <1>;
> +            #size-cells = <1>;

Starting with your example.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Andrew Jeffery]

On Fri, 12 Jul 2019, at 22:41, Maxime Ripard wrote:
> Hi,
> 
> On Fri, Jul 12, 2019 at 01:02:13PM +0930, Andrew Jeffery wrote:
> > The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> > SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> > data bus if only a single slot is enabled.
> >
> > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > ---
> > In v2:
> >
> > * Rename to aspeed,sdhci.yaml
> > * Rename sd-controller compatible
> > * Add `maxItems: 1` for reg properties
> > * Move sdhci subnode description to patternProperties
> > * Drop sdhci compatible requirement
> > * #address-cells and #size-cells are required
> > * Prevent additional properties
> > * Implement explicit ranges in example
> > * Remove slot property
> >
> >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
> >  1 file changed, 90 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > new file mode 100644
> > index 000000000000..67a691c3348c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > @@ -0,0 +1,90 @@
> > +# SPDX-License-Identifier: GPL-2.0-or-later
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ASPEED SD/SDIO/eMMC Controller
> > +
> > +maintainers:
> > +  - Andrew Jeffery <andrew@aj.id.au>
> > +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> > +
> > +description: |+
> > +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> > +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> > +  only a single slot is enabled.
> > +
> > +  The two slots are supported by a common configuration area. As the SDHCIs for
> > +  the slots are dependent on the common configuration area, they are described
> > +  as child nodes.
> > +
> > +properties:
> > +  compatible:
> > +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> > +  reg:
> > +    maxItems: 1
> > +    description: Common configuration registers
> > +  ranges: true
> > +  clocks:
> > +    maxItems: 1
> > +    description: The SD/SDIO controller clock gate
> 
> #address-cells and #size-cells have not been described here.
> 
> > +patternProperties:
> > +  "^sdhci@[0-9a-f]+$":
> > +    type: object
> > +    properties:
> > +      compatible:
> > +        enum: [ aspeed,ast2400-sdhci, aspeed,ast2500-sdhci ]
> > +      reg:
> > +        maxItems: 1
> > +        description: The SDHCI registers
> > +      clocks:
> > +        maxItems: 1
> > +        description: The SD bus clock
> > +      interrupts:
> > +        maxItems: 1
> > +        description: The SD interrupt shared between both slots
> > +    required:
> > +      - compatible
> > +      - reg
> > +      - clocks
> > +      - interrupts
> > +
> > +additionalProperties: false
> 
> But that means that it will generate a warning in your DT if you ever
> use them.
> 
> > +required:
> > +  - compatible
> > +  - reg
> > +  - "#address-cells"
> > +  - "#size-cells"
> > +  - ranges
> > +  - clocks
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/clock/aspeed-clock.h>
> > +    sdc@1e740000 {
> > +            compatible = "aspeed,ast2500-sd-controller";
> > +            reg = <0x1e740000 0x100>;
> > +            #address-cells = <1>;
> > +            #size-cells = <1>;
> 
> Starting with your example.

Heh, right. Thanks. I was inspecting the output of the `dt_binding_check` and
`dtbs_check` make targets, though maybe I overlooked this. The aspeed dtsis
do generate a quite a number of warnings which make it hard to parse, so I'm
going to send a series to clean that up too.

Andrew

> 
> Maxime
> 
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
> 
> Attachments:
> * signature.asc

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Rob Herring]

On Sun, Jul 14, 2019 at 8:30 PM Andrew Jeffery <andrew@aj.id.au> wrote:
>
>
>
> On Fri, 12 Jul 2019, at 22:41, Maxime Ripard wrote:
> > Hi,
> >
> > On Fri, Jul 12, 2019 at 01:02:13PM +0930, Andrew Jeffery wrote:
> > > The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> > > SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> > > data bus if only a single slot is enabled.
> > >
> > > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > > ---
> > > In v2:
> > >
> > > * Rename to aspeed,sdhci.yaml
> > > * Rename sd-controller compatible
> > > * Add `maxItems: 1` for reg properties
> > > * Move sdhci subnode description to patternProperties
> > > * Drop sdhci compatible requirement
> > > * #address-cells and #size-cells are required
> > > * Prevent additional properties
> > > * Implement explicit ranges in example
> > > * Remove slot property
> > >
> > >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
> > >  1 file changed, 90 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > new file mode 100644
> > > index 000000000000..67a691c3348c
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > @@ -0,0 +1,90 @@
> > > +# SPDX-License-Identifier: GPL-2.0-or-later
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: ASPEED SD/SDIO/eMMC Controller
> > > +
> > > +maintainers:
> > > +  - Andrew Jeffery <andrew@aj.id.au>
> > > +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> > > +
> > > +description: |+
> > > +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> > > +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> > > +  only a single slot is enabled.
> > > +
> > > +  The two slots are supported by a common configuration area. As the SDHCIs for
> > > +  the slots are dependent on the common configuration area, they are described
> > > +  as child nodes.
> > > +
> > > +properties:
> > > +  compatible:
> > > +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> > > +  reg:
> > > +    maxItems: 1
> > > +    description: Common configuration registers
> > > +  ranges: true
> > > +  clocks:
> > > +    maxItems: 1
> > > +    description: The SD/SDIO controller clock gate
> >
> > #address-cells and #size-cells have not been described here.
> >
> > > +patternProperties:
> > > +  "^sdhci@[0-9a-f]+$":
> > > +    type: object
> > > +    properties:
> > > +      compatible:
> > > +        enum: [ aspeed,ast2400-sdhci, aspeed,ast2500-sdhci ]
> > > +      reg:
> > > +        maxItems: 1
> > > +        description: The SDHCI registers
> > > +      clocks:
> > > +        maxItems: 1
> > > +        description: The SD bus clock
> > > +      interrupts:
> > > +        maxItems: 1
> > > +        description: The SD interrupt shared between both slots
> > > +    required:
> > > +      - compatible
> > > +      - reg
> > > +      - clocks
> > > +      - interrupts
> > > +
> > > +additionalProperties: false
> >
> > But that means that it will generate a warning in your DT if you ever
> > use them.
> >
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - "#address-cells"
> > > +  - "#size-cells"
> > > +  - ranges
> > > +  - clocks
> > > +
> > > +examples:
> > > +  - |
> > > +    #include <dt-bindings/clock/aspeed-clock.h>
> > > +    sdc@1e740000 {
> > > +            compatible = "aspeed,ast2500-sd-controller";
> > > +            reg = <0x1e740000 0x100>;
> > > +            #address-cells = <1>;
> > > +            #size-cells = <1>;
> >
> > Starting with your example.
>
> Heh, right. Thanks. I was inspecting the output of the `dt_binding_check` and
> `dtbs_check` make targets, though maybe I overlooked this. The aspeed dtsis
> do generate a quite a number of warnings which make it hard to parse, so I'm
> going to send a series to clean that up too.

FYI, This will run checks with only the schema file you specify:

make dtbs_check DT_SCHEMA_FILES=path/to/schema/file

Rob

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Rob Herring]

On Thu, Jul 11, 2019 at 9:32 PM Andrew Jeffery <andrew@aj.id.au> wrote:
>
> The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> data bus if only a single slot is enabled.
>
> Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> ---
> In v2:
>
> * Rename to aspeed,sdhci.yaml
> * Rename sd-controller compatible
> * Add `maxItems: 1` for reg properties
> * Move sdhci subnode description to patternProperties
> * Drop sdhci compatible requirement
> * #address-cells and #size-cells are required
> * Prevent additional properties
> * Implement explicit ranges in example
> * Remove slot property
>
>  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
>
> diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> new file mode 100644
> index 000000000000..67a691c3348c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED SD/SDIO/eMMC Controller
> +
> +maintainers:
> +  - Andrew Jeffery <andrew@aj.id.au>
> +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> +
> +description: |+
> +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> +  only a single slot is enabled.
> +
> +  The two slots are supported by a common configuration area. As the SDHCIs for
> +  the slots are dependent on the common configuration area, they are described
> +  as child nodes.
> +
> +properties:
> +  compatible:
> +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]

This is actually a list of 4 strings. Please reformat to 1 per line.

Rob

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Andrew Jeffery]

On Tue, 16 Jul 2019, at 07:47, Rob Herring wrote:
> On Thu, Jul 11, 2019 at 9:32 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> >
> > The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> > SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> > data bus if only a single slot is enabled.
> >
> > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > ---
> > In v2:
> >
> > * Rename to aspeed,sdhci.yaml
> > * Rename sd-controller compatible
> > * Add `maxItems: 1` for reg properties
> > * Move sdhci subnode description to patternProperties
> > * Drop sdhci compatible requirement
> > * #address-cells and #size-cells are required
> > * Prevent additional properties
> > * Implement explicit ranges in example
> > * Remove slot property
> >
> >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
> >  1 file changed, 90 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > new file mode 100644
> > index 000000000000..67a691c3348c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > @@ -0,0 +1,90 @@
> > +# SPDX-License-Identifier: GPL-2.0-or-later
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ASPEED SD/SDIO/eMMC Controller
> > +
> > +maintainers:
> > +  - Andrew Jeffery <andrew@aj.id.au>
> > +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> > +
> > +description: |+
> > +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> > +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> > +  only a single slot is enabled.
> > +
> > +  The two slots are supported by a common configuration area. As the SDHCIs for
> > +  the slots are dependent on the common configuration area, they are described
> > +  as child nodes.
> > +
> > +properties:
> > +  compatible:
> > +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> 
> This is actually a list of 4 strings. Please reformat to 1 per line.

On reflection that's obvious, but also a somewhat subtle interaction with the
preference for no quotes (the obvious caveat being "except where required").

Thanks for pointing it out.

I have been running `make dt_binding_check` and `make dtbs_check` over
these, looks like I need to up my game a bit though. Do you do additional things
in your workflow?

Andrew

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Rob Herring]

On Mon, Jul 15, 2019 at 6:36 PM Andrew Jeffery <andrew@aj.id.au> wrote:
>
>
>
> On Tue, 16 Jul 2019, at 07:47, Rob Herring wrote:
> > On Thu, Jul 11, 2019 at 9:32 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> > >
> > > The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> > > SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> > > data bus if only a single slot is enabled.
> > >
> > > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > > ---
> > > In v2:
> > >
> > > * Rename to aspeed,sdhci.yaml
> > > * Rename sd-controller compatible
> > > * Add `maxItems: 1` for reg properties
> > > * Move sdhci subnode description to patternProperties
> > > * Drop sdhci compatible requirement
> > > * #address-cells and #size-cells are required
> > > * Prevent additional properties
> > > * Implement explicit ranges in example
> > > * Remove slot property
> > >
> > >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
> > >  1 file changed, 90 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > new file mode 100644
> > > index 000000000000..67a691c3348c
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > @@ -0,0 +1,90 @@
> > > +# SPDX-License-Identifier: GPL-2.0-or-later
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: ASPEED SD/SDIO/eMMC Controller
> > > +
> > > +maintainers:
> > > +  - Andrew Jeffery <andrew@aj.id.au>
> > > +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> > > +
> > > +description: |+
> > > +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> > > +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> > > +  only a single slot is enabled.
> > > +
> > > +  The two slots are supported by a common configuration area. As the SDHCIs for
> > > +  the slots are dependent on the common configuration area, they are described
> > > +  as child nodes.
> > > +
> > > +properties:
> > > +  compatible:
> > > +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> >
> > This is actually a list of 4 strings. Please reformat to 1 per line.
>
> On reflection that's obvious, but also a somewhat subtle interaction with the
> preference for no quotes (the obvious caveat being "except where required").

It wasn't something I'd run into before. I'm working on a check, but
unfortunately we can only check for quotes not needed and can't check
for missing quotes.

> Thanks for pointing it out.
>
> I have been running `make dt_binding_check` and `make dtbs_check` over
> these, looks like I need to up my game a bit though. Do you do additional things
> in your workflow?

That should have thrown the warnings. If you aren't seeing those, do
you have dtschema package installed (see
Documentation/devicetree/writing-schema.md)? Or it could be erroring
out on something else first. There's a few breakages that I'm trying
to fix.

Rob

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Andrew Jeffery]

On Wed, 17 Jul 2019, at 00:27, Rob Herring wrote:
> On Mon, Jul 15, 2019 at 6:36 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> >
> >
> >
> > On Tue, 16 Jul 2019, at 07:47, Rob Herring wrote:
> > > On Thu, Jul 11, 2019 at 9:32 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> > > >
> > > > The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> > > > SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> > > > data bus if only a single slot is enabled.
> > > >
> > > > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > > > ---
> > > > In v2:
> > > >
> > > > * Rename to aspeed,sdhci.yaml
> > > > * Rename sd-controller compatible
> > > > * Add `maxItems: 1` for reg properties
> > > > * Move sdhci subnode description to patternProperties
> > > > * Drop sdhci compatible requirement
> > > > * #address-cells and #size-cells are required
> > > > * Prevent additional properties
> > > > * Implement explicit ranges in example
> > > > * Remove slot property
> > > >
> > > >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
> > > >  1 file changed, 90 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > new file mode 100644
> > > > index 000000000000..67a691c3348c
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > @@ -0,0 +1,90 @@
> > > > +# SPDX-License-Identifier: GPL-2.0-or-later
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: ASPEED SD/SDIO/eMMC Controller
> > > > +
> > > > +maintainers:
> > > > +  - Andrew Jeffery <andrew@aj.id.au>
> > > > +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> > > > +
> > > > +description: |+
> > > > +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> > > > +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> > > > +  only a single slot is enabled.
> > > > +
> > > > +  The two slots are supported by a common configuration area. As the SDHCIs for
> > > > +  the slots are dependent on the common configuration area, they are described
> > > > +  as child nodes.
> > > > +
> > > > +properties:
> > > > +  compatible:
> > > > +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> > >
> > > This is actually a list of 4 strings. Please reformat to 1 per line.
> >
> > On reflection that's obvious, but also a somewhat subtle interaction with the
> > preference for no quotes (the obvious caveat being "except where required").
> 
> It wasn't something I'd run into before. I'm working on a check, but
> unfortunately we can only check for quotes not needed and can't check
> for missing quotes.
> 
> > Thanks for pointing it out.
> >
> > I have been running `make dt_binding_check` and `make dtbs_check` over
> > these, looks like I need to up my game a bit though. Do you do additional things
> > in your workflow?
> 
> That should have thrown the warnings. If you aren't seeing those, do
> you have dtschema package installed (see
> Documentation/devicetree/writing-schema.md)?

I do have it installed, but as mentioned previously there's a fair few
warnings emitted currently by the Aspeed devicetrees, so it might have
got lost in the noise. I've started to clean that up, though probably need
some direction there too.

Separately I'm currently trying to track down an issue where I get errors
on the Aspeed dts cpu nodes about failing to match the riscv CPU
compatibles, it seems dt-validate isn't finding the ARM CPU compatible
strings. It feels more annoying to track down that I'd like.

> Or it could be erroring
> out on something else first. There's a few breakages that I'm trying
> to fix.

Okay. I'll keep an eye on the dt-schema repo.

Cheers,

Andrew

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Rob Herring]

On Tue, Jul 16, 2019 at 9:58 PM Andrew Jeffery <andrew@aj.id.au> wrote:
>
>
>
> On Wed, 17 Jul 2019, at 00:27, Rob Herring wrote:
> > On Mon, Jul 15, 2019 at 6:36 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> > >
> > >
> > >
> > > On Tue, 16 Jul 2019, at 07:47, Rob Herring wrote:
> > > > On Thu, Jul 11, 2019 at 9:32 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> > > > >
> > > > > The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> > > > > SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> > > > > data bus if only a single slot is enabled.
> > > > >
> > > > > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > > > > ---
> > > > > In v2:
> > > > >
> > > > > * Rename to aspeed,sdhci.yaml
> > > > > * Rename sd-controller compatible
> > > > > * Add `maxItems: 1` for reg properties
> > > > > * Move sdhci subnode description to patternProperties
> > > > > * Drop sdhci compatible requirement
> > > > > * #address-cells and #size-cells are required
> > > > > * Prevent additional properties
> > > > > * Implement explicit ranges in example
> > > > > * Remove slot property
> > > > >
> > > > >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
> > > > >  1 file changed, 90 insertions(+)
> > > > >  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > >
> > > > > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > > new file mode 100644
> > > > > index 000000000000..67a691c3348c
> > > > > --- /dev/null
> > > > > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > > @@ -0,0 +1,90 @@
> > > > > +# SPDX-License-Identifier: GPL-2.0-or-later
> > > > > +%YAML 1.2
> > > > > +---
> > > > > +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > > +
> > > > > +title: ASPEED SD/SDIO/eMMC Controller
> > > > > +
> > > > > +maintainers:
> > > > > +  - Andrew Jeffery <andrew@aj.id.au>
> > > > > +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> > > > > +
> > > > > +description: |+
> > > > > +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> > > > > +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> > > > > +  only a single slot is enabled.
> > > > > +
> > > > > +  The two slots are supported by a common configuration area. As the SDHCIs for
> > > > > +  the slots are dependent on the common configuration area, they are described
> > > > > +  as child nodes.
> > > > > +
> > > > > +properties:
> > > > > +  compatible:
> > > > > +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> > > >
> > > > This is actually a list of 4 strings. Please reformat to 1 per line.
> > >
> > > On reflection that's obvious, but also a somewhat subtle interaction with the
> > > preference for no quotes (the obvious caveat being "except where required").
> >
> > It wasn't something I'd run into before. I'm working on a check, but
> > unfortunately we can only check for quotes not needed and can't check
> > for missing quotes.
> >
> > > Thanks for pointing it out.
> > >
> > > I have been running `make dt_binding_check` and `make dtbs_check` over
> > > these, looks like I need to up my game a bit though. Do you do additional things
> > > in your workflow?
> >
> > That should have thrown the warnings. If you aren't seeing those, do
> > you have dtschema package installed (see
> > Documentation/devicetree/writing-schema.md)?
>
> I do have it installed, but as mentioned previously there's a fair few
> warnings emitted currently by the Aspeed devicetrees, so it might have
> got lost in the noise. I've started to clean that up, though probably need
> some direction there too.
>
> Separately I'm currently trying to track down an issue where I get errors
> on the Aspeed dts cpu nodes about failing to match the riscv CPU
> compatibles, it seems dt-validate isn't finding the ARM CPU compatible
> strings. It feels more annoying to track down that I'd like.

There's a fix in today's linux-next for that and it should be in
Linus' tree in a few days.

Rob

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Re: [PATCH v2 1/2] dt-bindings: mmc: Document Aspeed SD controller

[Andrew Jeffery]

On Wed, 17 Jul 2019, at 23:13, Rob Herring wrote:
> On Tue, Jul 16, 2019 at 9:58 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> >
> >
> >
> > On Wed, 17 Jul 2019, at 00:27, Rob Herring wrote:
> > > On Mon, Jul 15, 2019 at 6:36 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> > > >
> > > >
> > > >
> > > > On Tue, 16 Jul 2019, at 07:47, Rob Herring wrote:
> > > > > On Thu, Jul 11, 2019 at 9:32 PM Andrew Jeffery <andrew@aj.id.au> wrote:
> > > > > >
> > > > > > The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the
> > > > > > SDIO Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit
> > > > > > data bus if only a single slot is enabled.
> > > > > >
> > > > > > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> > > > > > ---
> > > > > > In v2:
> > > > > >
> > > > > > * Rename to aspeed,sdhci.yaml
> > > > > > * Rename sd-controller compatible
> > > > > > * Add `maxItems: 1` for reg properties
> > > > > > * Move sdhci subnode description to patternProperties
> > > > > > * Drop sdhci compatible requirement
> > > > > > * #address-cells and #size-cells are required
> > > > > > * Prevent additional properties
> > > > > > * Implement explicit ranges in example
> > > > > > * Remove slot property
> > > > > >
> > > > > >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 90 +++++++++++++++++++
> > > > > >  1 file changed, 90 insertions(+)
> > > > > >  create mode 100644 Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > > >
> > > > > > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > > > new file mode 100644
> > > > > > index 000000000000..67a691c3348c
> > > > > > --- /dev/null
> > > > > > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > > > > @@ -0,0 +1,90 @@
> > > > > > +# SPDX-License-Identifier: GPL-2.0-or-later
> > > > > > +%YAML 1.2
> > > > > > +---
> > > > > > +$id: http://devicetree.org/schemas/mmc/aspeed,sdhci.yaml#
> > > > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > > > +
> > > > > > +title: ASPEED SD/SDIO/eMMC Controller
> > > > > > +
> > > > > > +maintainers:
> > > > > > +  - Andrew Jeffery <andrew@aj.id.au>
> > > > > > +  - Ryan Chen <ryanchen.aspeed@gmail.com>
> > > > > > +
> > > > > > +description: |+
> > > > > > +  The ASPEED SD/SDIO/eMMC controller exposes two slots implementing the SDIO
> > > > > > +  Host Specification v2.00, with 1 or 4 bit data buses, or an 8 bit data bus if
> > > > > > +  only a single slot is enabled.
> > > > > > +
> > > > > > +  The two slots are supported by a common configuration area. As the SDHCIs for
> > > > > > +  the slots are dependent on the common configuration area, they are described
> > > > > > +  as child nodes.
> > > > > > +
> > > > > > +properties:
> > > > > > +  compatible:
> > > > > > +    enum: [ aspeed,ast2400-sd-controller, aspeed,ast2500-sd-controller ]
> > > > >
> > > > > This is actually a list of 4 strings. Please reformat to 1 per line.
> > > >
> > > > On reflection that's obvious, but also a somewhat subtle interaction with the
> > > > preference for no quotes (the obvious caveat being "except where required").
> > >
> > > It wasn't something I'd run into before. I'm working on a check, but
> > > unfortunately we can only check for quotes not needed and can't check
> > > for missing quotes.
> > >
> > > > Thanks for pointing it out.
> > > >
> > > > I have been running `make dt_binding_check` and `make dtbs_check` over
> > > > these, looks like I need to up my game a bit though. Do you do additional things
> > > > in your workflow?
> > >
> > > That should have thrown the warnings. If you aren't seeing those, do
> > > you have dtschema package installed (see
> > > Documentation/devicetree/writing-schema.md)?
> >
> > I do have it installed, but as mentioned previously there's a fair few
> > warnings emitted currently by the Aspeed devicetrees, so it might have
> > got lost in the noise. I've started to clean that up, though probably need
> > some direction there too.
> >
> > Separately I'm currently trying to track down an issue where I get errors
> > on the Aspeed dts cpu nodes about failing to match the riscv CPU
> > compatibles, it seems dt-validate isn't finding the ARM CPU compatible
> > strings. It feels more annoying to track down that I'd like.
> 
> There's a fix in today's linux-next for that and it should be in
> Linus' tree in a few days.
> 

Thanks, I'll take a look.

Andrew

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Re: [PATCH v2 2/2] mmc: Add support for the ASPEED SD controller

[Adrian Hunter]

On 12/07/19 6:32 AM, Andrew Jeffery wrote:
> Add a minimal driver for ASPEED's SD controller, which exposes two
> SDHCIs.
> 
> The ASPEED design implements a common register set for the SDHCIs, and
> moves some of the standard configuration elements out to this common
> area (e.g. 8-bit mode, and card detect configuration which is not
> currently supported).
> 
> The SD controller has a dedicated hardware interrupt that is shared
> between the slots. The common register set exposes information on which
> slot triggered the interrupt; early revisions of the patch introduced an
> irqchip for the register, but reality is it doesn't behave as an
> irqchip, and the result fits awkwardly into the irqchip APIs. Instead
> I've taken the simple approach of using the IRQ as a shared IRQ with
> some minor performance impact for the second slot.
> 
> Ryan was the original author of the patch - I've taken his work and
> massaged it to drop the irqchip support and rework the devicetree
> integration. The driver has been smoke tested under qemu against a
> minimal SD controller model and lightly tested on an ast2500-evb.
> 
> Signed-off-by: Ryan Chen <ryanchen.aspeed@gmail.com>
> Signed-off-by: Andrew Jeffery <andrew@aj.id.au>

Looks fine.  Few minor comments below.

> ---
> In v2:
> 
> * Drop unnecesasry MODULE_DEVICE_TABLE()
> * Rename sd-controller compatible
> * Add IBM copyright
> * Drop unnecesary data assignment in of match table entries
> * Derive the slot from the SDHCI offset
> 
>  drivers/mmc/host/Kconfig           |  12 ++
>  drivers/mmc/host/Makefile          |   1 +
>  drivers/mmc/host/sdhci-of-aspeed.c | 326 +++++++++++++++++++++++++++++
>  3 files changed, 339 insertions(+)
>  create mode 100644 drivers/mmc/host/sdhci-of-aspeed.c
> 
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 931770f17087..2bb5e1264b3d 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -154,6 +154,18 @@ config MMC_SDHCI_OF_ARASAN
>  
>  	  If unsure, say N.
>  
> +config MMC_SDHCI_OF_ASPEED
> +	tristate "SDHCI OF support for the ASPEED SDHCI controller"
> +	depends on MMC_SDHCI_PLTFM
> +	depends on OF
> +	help
> +	  This selects the ASPEED Secure Digital Host Controller Interface.
> +
> +	  If you have a controller with this interface, say Y or M here. You
> +	  also need to enable an appropriate bus interface.
> +
> +	  If unsure, say N.
> +
>  config MMC_SDHCI_OF_AT91
>  	tristate "SDHCI OF support for the Atmel SDMMC controller"
>  	depends on MMC_SDHCI_PLTFM
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 73578718f119..390ee162fe71 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -84,6 +84,7 @@ obj-$(CONFIG_MMC_SDHCI_ESDHC_IMX)	+= sdhci-esdhc-imx.o
>  obj-$(CONFIG_MMC_SDHCI_DOVE)		+= sdhci-dove.o
>  obj-$(CONFIG_MMC_SDHCI_TEGRA)		+= sdhci-tegra.o
>  obj-$(CONFIG_MMC_SDHCI_OF_ARASAN)	+= sdhci-of-arasan.o
> +obj-$(CONFIG_MMC_SDHCI_OF_ASPEED)	+= sdhci-of-aspeed.o
>  obj-$(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
> diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
> new file mode 100644
> index 000000000000..9528e43c257d
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-of-aspeed.c
> @@ -0,0 +1,326 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/* Copyright (C) 2019 ASPEED Technology Inc. */
> +/* Copyright (C) 2019 IBM Corp. */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/mmc/host.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/spinlock.h>
> +
> +#include "sdhci-pltfm.h"
> +
> +#define ASPEED_SDC_INFO		0x00
> +#define   ASPEED_SDC_S1MMC8	BIT(25)
> +#define   ASPEED_SDC_S0MMC8	BIT(24)
> +
> +struct aspeed_sdc {
> +	struct clk *clk;
> +	struct resource *res;
> +
> +	spinlock_t lock;
> +	void __iomem *regs;
> +};
> +
> +struct aspeed_sdhci {
> +	struct aspeed_sdc *parent;
> +	u32 width_mask;
> +};
> +
> +static void aspeed_sdc_bus_width(struct aspeed_sdc *sdc,
> +				 struct aspeed_sdhci *sdhci, bool bus8)

The function name threw me at first.  I suggest:

static void aspeed_sdhci_set_clr_8_bit_mode(struct aspeed_sdhci *aspeed_sdhci,
					    bool bus8)
{
	struct aspeed_sdc *aspeed_sdc = aspeed_sdhci->parent;

> +{
> +	u32 info;
> +
> +	/* Set/clear 8 bit mode */
> +	spin_lock(&sdc->lock);
> +	info = readl(sdc->regs + ASPEED_SDC_INFO);
> +	if (bus8)
> +		info |= sdhci->width_mask;
> +	else
> +		info &= ~sdhci->width_mask;
> +	writel(info, sdc->regs + ASPEED_SDC_INFO);
> +	spin_unlock(&sdc->lock);
> +}
> +
> +static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> +{
> +	unsigned long timeout;
> +	int div;
> +	u16 clk;
> +
> +	if (clock == host->clock)
> +		return;
> +
> +	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> +
> +	if (clock == 0)
> +		goto out;
> +
> +	for (div = 1; div < 256; div *= 2) {
> +		if ((host->max_clk / div) <= clock)
> +			break;
> +	}
> +	div >>= 1;
> +
> +	clk = div << SDHCI_DIVIDER_SHIFT;

Could call sdhci_enable_clk() here.

> +	clk |= SDHCI_CLOCK_INT_EN;
> +	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +
> +	/* Wait max 20 ms */
> +	timeout = 20;
> +	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
> +		 & SDHCI_CLOCK_INT_STABLE)) {
> +		if (timeout == 0) {
> +			pr_err("%s: Internal clock never stabilised.\n",
> +			       mmc_hostname(host->mmc));
> +			return;
> +		}
> +		timeout--;
> +		mdelay(1);
> +	}
> +
> +	clk |= SDHCI_CLOCK_CARD_EN;
> +	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> +
> +out:
> +	host->clock = clock;
> +}
> +
> +static void aspeed_sdhci_set_bus_width(struct sdhci_host *host, int width)
> +{
> +	struct sdhci_pltfm_host *pltfm_priv;
> +	struct aspeed_sdhci *aspeed_sdhci;
> +	struct aspeed_sdc *aspeed_sdc;
> +	u8 ctrl;
> +
> +	pltfm_priv = sdhci_priv(host);
> +	aspeed_sdhci = sdhci_pltfm_priv(pltfm_priv);
> +	aspeed_sdc = aspeed_sdhci->parent;
> +
> +	/* Set/clear 8-bit mode */
> +	aspeed_sdc_bus_width(aspeed_sdc, aspeed_sdhci,
> +			     width == MMC_BUS_WIDTH_8);
> +
> +	/* Set/clear 1 or 4 bit mode */
> +	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> +	if (width == MMC_BUS_WIDTH_4)
> +		ctrl |= SDHCI_CTRL_4BITBUS;
> +	else
> +		ctrl &= ~SDHCI_CTRL_4BITBUS;
> +	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> +}
> +
> +static const struct sdhci_ops aspeed_sdhci_ops = {
> +	.set_clock = aspeed_sdhci_set_clock,
> +	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
> +	.set_bus_width = aspeed_sdhci_set_bus_width,
> +	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
> +	.reset = sdhci_reset,
> +	.set_uhs_signaling = sdhci_set_uhs_signaling,
> +};
> +
> +static const struct sdhci_pltfm_data aspeed_sdc_pdata = {

Up to you, but this is for the aspeed_sdhci driver, so I would
have expected it to be called aspeed_sdhci_pdata

> +	.ops = &aspeed_sdhci_ops,
> +	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> +	.quirks2 = SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,

You don't use sdhci_set_clock() or sdhci_calc_clk(), so it doesn't
look like SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN is needed.

> +};
> +
> +static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev,
> +					      struct resource *res)
> +{
> +	resource_size_t delta;
> +
> +	if (!res || resource_type(res) != IORESOURCE_MEM)
> +		return -EINVAL;
> +
> +	if (res->start < dev->parent->res->start)
> +		return -EINVAL;
> +
> +	delta = res->start - dev->parent->res->start;
> +	if (delta & (0x100 - 1))
> +		return -EINVAL;
> +
> +	return (delta / 0x100) - 1;
> +}
> +
> +static int aspeed_sdhci_probe(struct platform_device *pdev)
> +{
> +	struct sdhci_pltfm_host *pltfm_host;
> +	struct aspeed_sdhci *dev;
> +	struct sdhci_host *host;
> +	struct resource *res;
> +	int slot;
> +	int ret;
> +
> +	host = sdhci_pltfm_init(pdev, &aspeed_sdc_pdata, sizeof(*dev));
> +	if (IS_ERR(host))
> +		return PTR_ERR(host);
> +
> +	pltfm_host = sdhci_priv(host);
> +	dev = sdhci_pltfm_priv(pltfm_host);
> +	dev->parent = dev_get_drvdata(pdev->dev.parent);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	slot = aspeed_sdhci_calculate_slot(dev, res);
> +	if (slot < 0)
> +		return slot;
> +	dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
> +	dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;

That implies that you only support 2 slots which begs the question why
you don't validate slot.

> +
> +	sdhci_get_of_property(pdev);
> +
> +	pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(pltfm_host->clk))
> +		return PTR_ERR(pltfm_host->clk);
> +
> +	ret = clk_prepare_enable(pltfm_host->clk);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Unable to enable SDIO clock\n");
> +		goto err_pltfm_free;
> +	}
> +
> +	ret = mmc_of_parse(host->mmc);
> +	if (ret)
> +		goto err_sdhci_add;
> +
> +	ret = sdhci_add_host(host);
> +	if (ret)
> +		goto err_sdhci_add;
> +
> +	return 0;
> +
> +err_sdhci_add:
> +	clk_disable_unprepare(pltfm_host->clk);
> +err_pltfm_free:
> +	sdhci_pltfm_free(pdev);
> +	return ret;
> +}
> +
> +static int aspeed_sdhci_remove(struct platform_device *pdev)
> +{
> +	struct sdhci_pltfm_host *pltfm_host;
> +	struct sdhci_host *host;
> +	int dead;
> +
> +	host = platform_get_drvdata(pdev);
> +	pltfm_host = sdhci_priv(host);
> +
> +	dead = readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff;

'dead' only makes sense for PCI. Just set it to zero.

> +
> +	sdhci_remove_host(host, dead);
> +
> +	clk_disable_unprepare(pltfm_host->clk);
> +
> +	sdhci_pltfm_free(pdev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id aspeed_sdhci_of_match[] = {
> +	{ .compatible = "aspeed,ast2400-sdhci", },
> +	{ .compatible = "aspeed,ast2500-sdhci", },
> +	{ }
> +};
> +
> +static struct platform_driver aspeed_sdhci_driver = {
> +	.driver		= {
> +		.name	= "sdhci-aspeed",
> +		.of_match_table = aspeed_sdhci_of_match,
> +	},
> +	.probe		= aspeed_sdhci_probe,
> +	.remove		= aspeed_sdhci_remove,
> +};
> +
> +module_platform_driver(aspeed_sdhci_driver);
> +
> +static int aspeed_sdc_probe(struct platform_device *pdev)
> +
> +{
> +	struct device_node *parent, *child;
> +	struct aspeed_sdc *sdc;
> +	int ret;
> +
> +	sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
> +	if (!sdc)
> +		return -ENOMEM;
> +
> +	spin_lock_init(&sdc->lock);
> +
> +	sdc->clk = devm_clk_get(&pdev->dev, NULL);
> +	if (IS_ERR(sdc->clk))
> +		return PTR_ERR(sdc->clk);
> +
> +	ret = clk_prepare_enable(sdc->clk);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Unable to enable SDCLK\n");
> +		return ret;
> +	}
> +
> +	sdc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	sdc->regs = devm_ioremap_resource(&pdev->dev, sdc->res);
> +	if (IS_ERR(sdc->regs)) {
> +		ret = PTR_ERR(sdc->regs);
> +		goto err_clk;
> +	}
> +
> +	dev_set_drvdata(&pdev->dev, sdc);
> +
> +	parent = pdev->dev.of_node;
> +	for_each_available_child_of_node(parent, child) {
> +		struct platform_device *cpdev;
> +
> +		cpdev = of_platform_device_create(child, NULL, &pdev->dev);
> +		if (IS_ERR(cpdev)) {
> +			of_node_put(child);
> +			ret = PTR_ERR(pdev);
> +			goto err_clk;
> +		}
> +	}
> +
> +	return 0;
> +
> +err_clk:
> +	clk_disable_unprepare(sdc->clk);
> +	return ret;
> +}
> +
> +static int aspeed_sdc_remove(struct platform_device *pdev)
> +{
> +	struct aspeed_sdc *sdc = dev_get_drvdata(&pdev->dev);
> +
> +	clk_disable_unprepare(sdc->clk);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id aspeed_sdc_of_match[] = {
> +	{ .compatible = "aspeed,ast2400-sd-controller", },
> +	{ .compatible = "aspeed,ast2500-sd-controller", },
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(of, aspeed_sdc_of_match);
> +
> +static struct platform_driver aspeed_sdc_driver = {
> +	.driver		= {
> +		.name	= "sd-controller-aspeed",
> +		.pm	= &sdhci_pltfm_pmops,
> +		.of_match_table = aspeed_sdc_of_match,
> +	},
> +	.probe		= aspeed_sdc_probe,
> +	.remove		= aspeed_sdc_remove,
> +};
> +
> +module_platform_driver(aspeed_sdc_driver);
> +
> +MODULE_DESCRIPTION("Driver for the ASPEED SD/SDIO/SDHCI Controllers");
> +MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>");
> +MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
> +MODULE_LICENSE("GPL v2");
> 


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Re: [PATCH v2 2/2] mmc: Add support for the ASPEED SD controller

[Andrew Jeffery]

On Thu, 25 Jul 2019, at 22:49, Adrian Hunter wrote:
> On 12/07/19 6:32 AM, Andrew Jeffery wrote:
> > Add a minimal driver for ASPEED's SD controller, which exposes two
> > SDHCIs.
> > 
> > The ASPEED design implements a common register set for the SDHCIs, and
> > moves some of the standard configuration elements out to this common
> > area (e.g. 8-bit mode, and card detect configuration which is not
> > currently supported).
> > 
> > The SD controller has a dedicated hardware interrupt that is shared
> > between the slots. The common register set exposes information on which
> > slot triggered the interrupt; early revisions of the patch introduced an
> > irqchip for the register, but reality is it doesn't behave as an
> > irqchip, and the result fits awkwardly into the irqchip APIs. Instead
> > I've taken the simple approach of using the IRQ as a shared IRQ with
> > some minor performance impact for the second slot.
> > 
> > Ryan was the original author of the patch - I've taken his work and
> > massaged it to drop the irqchip support and rework the devicetree
> > integration. The driver has been smoke tested under qemu against a
> > minimal SD controller model and lightly tested on an ast2500-evb.
> > 
> > Signed-off-by: Ryan Chen <ryanchen.aspeed@gmail.com>
> > Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
> 
> Looks fine.  Few minor comments below.
> 
> > ---
> > In v2:
> > 
> > * Drop unnecesasry MODULE_DEVICE_TABLE()
> > * Rename sd-controller compatible
> > * Add IBM copyright
> > * Drop unnecesary data assignment in of match table entries
> > * Derive the slot from the SDHCI offset
> > 
> >  drivers/mmc/host/Kconfig           |  12 ++
> >  drivers/mmc/host/Makefile          |   1 +
> >  drivers/mmc/host/sdhci-of-aspeed.c | 326 +++++++++++++++++++++++++++++
> >  3 files changed, 339 insertions(+)
> >  create mode 100644 drivers/mmc/host/sdhci-of-aspeed.c
> > 
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index 931770f17087..2bb5e1264b3d 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -154,6 +154,18 @@ config MMC_SDHCI_OF_ARASAN
> >  
> >  	  If unsure, say N.
> >  
> > +config MMC_SDHCI_OF_ASPEED
> > +	tristate "SDHCI OF support for the ASPEED SDHCI controller"
> > +	depends on MMC_SDHCI_PLTFM
> > +	depends on OF
> > +	help
> > +	  This selects the ASPEED Secure Digital Host Controller Interface.
> > +
> > +	  If you have a controller with this interface, say Y or M here. You
> > +	  also need to enable an appropriate bus interface.
> > +
> > +	  If unsure, say N.
> > +
> >  config MMC_SDHCI_OF_AT91
> >  	tristate "SDHCI OF support for the Atmel SDMMC controller"
> >  	depends on MMC_SDHCI_PLTFM
> > diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> > index 73578718f119..390ee162fe71 100644
> > --- a/drivers/mmc/host/Makefile
> > +++ b/drivers/mmc/host/Makefile
> > @@ -84,6 +84,7 @@ obj-$(CONFIG_MMC_SDHCI_ESDHC_IMX)	+= sdhci-esdhc-imx.o
> >  obj-$(CONFIG_MMC_SDHCI_DOVE)		+= sdhci-dove.o
> >  obj-$(CONFIG_MMC_SDHCI_TEGRA)		+= sdhci-tegra.o
> >  obj-$(CONFIG_MMC_SDHCI_OF_ARASAN)	+= sdhci-of-arasan.o
> > +obj-$(CONFIG_MMC_SDHCI_OF_ASPEED)	+= sdhci-of-aspeed.o
> >  obj-$(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
> > diff --git a/drivers/mmc/host/sdhci-of-aspeed.c b/drivers/mmc/host/sdhci-of-aspeed.c
> > new file mode 100644
> > index 000000000000..9528e43c257d
> > --- /dev/null
> > +++ b/drivers/mmc/host/sdhci-of-aspeed.c
> > @@ -0,0 +1,326 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/* Copyright (C) 2019 ASPEED Technology Inc. */
> > +/* Copyright (C) 2019 IBM Corp. */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/delay.h>
> > +#include <linux/device.h>
> > +#include <linux/io.h>
> > +#include <linux/mmc/host.h>
> > +#include <linux/module.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/spinlock.h>
> > +
> > +#include "sdhci-pltfm.h"
> > +
> > +#define ASPEED_SDC_INFO		0x00
> > +#define   ASPEED_SDC_S1MMC8	BIT(25)
> > +#define   ASPEED_SDC_S0MMC8	BIT(24)
> > +
> > +struct aspeed_sdc {
> > +	struct clk *clk;
> > +	struct resource *res;
> > +
> > +	spinlock_t lock;
> > +	void __iomem *regs;
> > +};
> > +
> > +struct aspeed_sdhci {
> > +	struct aspeed_sdc *parent;
> > +	u32 width_mask;
> > +};
> > +
> > +static void aspeed_sdc_bus_width(struct aspeed_sdc *sdc,
> > +				 struct aspeed_sdhci *sdhci, bool bus8)
> 
> The function name threw me at first.  I suggest:
> 
> static void aspeed_sdhci_set_clr_8_bit_mode(struct aspeed_sdhci *aspeed_sdhci,
> 					    bool bus8)

I wasn't real happy with the name I picked, so was hoping to some degree to be
bike-shedded on it. I'll fix it up.

> {
> 	struct aspeed_sdc *aspeed_sdc = aspeed_sdhci->parent;
> 
> > +{
> > +	u32 info;
> > +
> > +	/* Set/clear 8 bit mode */
> > +	spin_lock(&sdc->lock);
> > +	info = readl(sdc->regs + ASPEED_SDC_INFO);
> > +	if (bus8)
> > +		info |= sdhci->width_mask;
> > +	else
> > +		info &= ~sdhci->width_mask;
> > +	writel(info, sdc->regs + ASPEED_SDC_INFO);
> > +	spin_unlock(&sdc->lock);
> > +}
> > +
> > +static void aspeed_sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
> > +{
> > +	unsigned long timeout;
> > +	int div;
> > +	u16 clk;
> > +
> > +	if (clock == host->clock)
> > +		return;
> > +
> > +	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
> > +
> > +	if (clock == 0)
> > +		goto out;
> > +
> > +	for (div = 1; div < 256; div *= 2) {
> > +		if ((host->max_clk / div) <= clock)
> > +			break;
> > +	}
> > +	div >>= 1;
> > +
> > +	clk = div << SDHCI_DIVIDER_SHIFT;
> 
> Could call sdhci_enable_clk() here.

I'll look into it.

> 
> > +	clk |= SDHCI_CLOCK_INT_EN;
> > +	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +
> > +	/* Wait max 20 ms */
> > +	timeout = 20;
> > +	while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
> > +		 & SDHCI_CLOCK_INT_STABLE)) {
> > +		if (timeout == 0) {
> > +			pr_err("%s: Internal clock never stabilised.\n",
> > +			       mmc_hostname(host->mmc));
> > +			return;
> > +		}
> > +		timeout--;
> > +		mdelay(1);
> > +	}
> > +
> > +	clk |= SDHCI_CLOCK_CARD_EN;
> > +	sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
> > +
> > +out:
> > +	host->clock = clock;
> > +}
> > +
> > +static void aspeed_sdhci_set_bus_width(struct sdhci_host *host, int width)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_priv;
> > +	struct aspeed_sdhci *aspeed_sdhci;
> > +	struct aspeed_sdc *aspeed_sdc;
> > +	u8 ctrl;
> > +
> > +	pltfm_priv = sdhci_priv(host);
> > +	aspeed_sdhci = sdhci_pltfm_priv(pltfm_priv);
> > +	aspeed_sdc = aspeed_sdhci->parent;
> > +
> > +	/* Set/clear 8-bit mode */
> > +	aspeed_sdc_bus_width(aspeed_sdc, aspeed_sdhci,
> > +			     width == MMC_BUS_WIDTH_8);
> > +
> > +	/* Set/clear 1 or 4 bit mode */
> > +	ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> > +	if (width == MMC_BUS_WIDTH_4)
> > +		ctrl |= SDHCI_CTRL_4BITBUS;
> > +	else
> > +		ctrl &= ~SDHCI_CTRL_4BITBUS;
> > +	sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> > +}
> > +
> > +static const struct sdhci_ops aspeed_sdhci_ops = {
> > +	.set_clock = aspeed_sdhci_set_clock,
> > +	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
> > +	.set_bus_width = aspeed_sdhci_set_bus_width,
> > +	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
> > +	.reset = sdhci_reset,
> > +	.set_uhs_signaling = sdhci_set_uhs_signaling,
> > +};
> > +
> > +static const struct sdhci_pltfm_data aspeed_sdc_pdata = {
> 
> Up to you, but this is for the aspeed_sdhci driver, so I would
> have expected it to be called aspeed_sdhci_pdata

Uh, yeah. Good catch.

> 
> > +	.ops = &aspeed_sdhci_ops,
> > +	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> > +	.quirks2 = SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
> 
> You don't use sdhci_set_clock() or sdhci_calc_clk(), so it doesn't
> look like SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN is needed.

I did look at that and was a bit suspicious about it, good to have my suspicion
confirmed.

> 
> > +};
> > +
> > +static inline int aspeed_sdhci_calculate_slot(struct aspeed_sdhci *dev,
> > +					      struct resource *res)
> > +{
> > +	resource_size_t delta;
> > +
> > +	if (!res || resource_type(res) != IORESOURCE_MEM)
> > +		return -EINVAL;
> > +
> > +	if (res->start < dev->parent->res->start)
> > +		return -EINVAL;
> > +
> > +	delta = res->start - dev->parent->res->start;
> > +	if (delta & (0x100 - 1))
> > +		return -EINVAL;
> > +
> > +	return (delta / 0x100) - 1;
> > +}
> > +
> > +static int aspeed_sdhci_probe(struct platform_device *pdev)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host;
> > +	struct aspeed_sdhci *dev;
> > +	struct sdhci_host *host;
> > +	struct resource *res;
> > +	int slot;
> > +	int ret;
> > +
> > +	host = sdhci_pltfm_init(pdev, &aspeed_sdc_pdata, sizeof(*dev));
> > +	if (IS_ERR(host))
> > +		return PTR_ERR(host);
> > +
> > +	pltfm_host = sdhci_priv(host);
> > +	dev = sdhci_pltfm_priv(pltfm_host);
> > +	dev->parent = dev_get_drvdata(pdev->dev.parent);
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	slot = aspeed_sdhci_calculate_slot(dev, res);
> > +	if (slot < 0)
> > +		return slot;
> > +	dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
> > +	dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;
> 
> That implies that you only support 2 slots which begs the question why
> you don't validate slot.

I'm not sure what you mean here, but I'll dig into it.

> 
> > +
> > +	sdhci_get_of_property(pdev);
> > +
> > +	pltfm_host->clk = devm_clk_get(&pdev->dev, NULL);
> > +	if (IS_ERR(pltfm_host->clk))
> > +		return PTR_ERR(pltfm_host->clk);
> > +
> > +	ret = clk_prepare_enable(pltfm_host->clk);
> > +	if (ret) {
> > +		dev_err(&pdev->dev, "Unable to enable SDIO clock\n");
> > +		goto err_pltfm_free;
> > +	}
> > +
> > +	ret = mmc_of_parse(host->mmc);
> > +	if (ret)
> > +		goto err_sdhci_add;
> > +
> > +	ret = sdhci_add_host(host);
> > +	if (ret)
> > +		goto err_sdhci_add;
> > +
> > +	return 0;
> > +
> > +err_sdhci_add:
> > +	clk_disable_unprepare(pltfm_host->clk);
> > +err_pltfm_free:
> > +	sdhci_pltfm_free(pdev);
> > +	return ret;
> > +}
> > +
> > +static int aspeed_sdhci_remove(struct platform_device *pdev)
> > +{
> > +	struct sdhci_pltfm_host *pltfm_host;
> > +	struct sdhci_host *host;
> > +	int dead;
> > +
> > +	host = platform_get_drvdata(pdev);
> > +	pltfm_host = sdhci_priv(host);
> > +
> > +	dead = readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff;
> 
> 'dead' only makes sense for PCI. Just set it to zero.

Ack.

Thanks for the feedback, I'll send a v3.

Andrew

> 
> > +
> > +	sdhci_remove_host(host, dead);
> > +
> > +	clk_disable_unprepare(pltfm_host->clk);
> > +
> > +	sdhci_pltfm_free(pdev);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id aspeed_sdhci_of_match[] = {
> > +	{ .compatible = "aspeed,ast2400-sdhci", },
> > +	{ .compatible = "aspeed,ast2500-sdhci", },
> > +	{ }
> > +};
> > +
> > +static struct platform_driver aspeed_sdhci_driver = {
> > +	.driver		= {
> > +		.name	= "sdhci-aspeed",
> > +		.of_match_table = aspeed_sdhci_of_match,
> > +	},
> > +	.probe		= aspeed_sdhci_probe,
> > +	.remove		= aspeed_sdhci_remove,
> > +};
> > +
> > +module_platform_driver(aspeed_sdhci_driver);
> > +
> > +static int aspeed_sdc_probe(struct platform_device *pdev)
> > +
> > +{
> > +	struct device_node *parent, *child;
> > +	struct aspeed_sdc *sdc;
> > +	int ret;
> > +
> > +	sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL);
> > +	if (!sdc)
> > +		return -ENOMEM;
> > +
> > +	spin_lock_init(&sdc->lock);
> > +
> > +	sdc->clk = devm_clk_get(&pdev->dev, NULL);
> > +	if (IS_ERR(sdc->clk))
> > +		return PTR_ERR(sdc->clk);
> > +
> > +	ret = clk_prepare_enable(sdc->clk);
> > +	if (ret) {
> > +		dev_err(&pdev->dev, "Unable to enable SDCLK\n");
> > +		return ret;
> > +	}
> > +
> > +	sdc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > +	sdc->regs = devm_ioremap_resource(&pdev->dev, sdc->res);
> > +	if (IS_ERR(sdc->regs)) {
> > +		ret = PTR_ERR(sdc->regs);
> > +		goto err_clk;
> > +	}
> > +
> > +	dev_set_drvdata(&pdev->dev, sdc);
> > +
> > +	parent = pdev->dev.of_node;
> > +	for_each_available_child_of_node(parent, child) {
> > +		struct platform_device *cpdev;
> > +
> > +		cpdev = of_platform_device_create(child, NULL, &pdev->dev);
> > +		if (IS_ERR(cpdev)) {
> > +			of_node_put(child);
> > +			ret = PTR_ERR(pdev);
> > +			goto err_clk;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +
> > +err_clk:
> > +	clk_disable_unprepare(sdc->clk);
> > +	return ret;
> > +}
> > +
> > +static int aspeed_sdc_remove(struct platform_device *pdev)
> > +{
> > +	struct aspeed_sdc *sdc = dev_get_drvdata(&pdev->dev);
> > +
> > +	clk_disable_unprepare(sdc->clk);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id aspeed_sdc_of_match[] = {
> > +	{ .compatible = "aspeed,ast2400-sd-controller", },
> > +	{ .compatible = "aspeed,ast2500-sd-controller", },
> > +	{ }
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, aspeed_sdc_of_match);
> > +
> > +static struct platform_driver aspeed_sdc_driver = {
> > +	.driver		= {
> > +		.name	= "sd-controller-aspeed",
> > +		.pm	= &sdhci_pltfm_pmops,
> > +		.of_match_table = aspeed_sdc_of_match,
> > +	},
> > +	.probe		= aspeed_sdc_probe,
> > +	.remove		= aspeed_sdc_remove,
> > +};
> > +
> > +module_platform_driver(aspeed_sdc_driver);
> > +
> > +MODULE_DESCRIPTION("Driver for the ASPEED SD/SDIO/SDHCI Controllers");
> > +MODULE_AUTHOR("Ryan Chen <ryan_chen@aspeedtech.com>");
> > +MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
> > +MODULE_LICENSE("GPL v2");
> > 
> 
>

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Re: [PATCH v2 2/2] mmc: Add support for the ASPEED SD controller

[Adrian Hunter]

On 26/07/19 3:52 AM, Andrew Jeffery wrote:
> On Thu, 25 Jul 2019, at 22:49, Adrian Hunter wrote:
>> On 12/07/19 6:32 AM, Andrew Jeffery wrote:
>>> +static int aspeed_sdhci_probe(struct platform_device *pdev)
>>> +{
>>> +	struct sdhci_pltfm_host *pltfm_host;
>>> +	struct aspeed_sdhci *dev;
>>> +	struct sdhci_host *host;
>>> +	struct resource *res;
>>> +	int slot;
>>> +	int ret;
>>> +
>>> +	host = sdhci_pltfm_init(pdev, &aspeed_sdc_pdata, sizeof(*dev));
>>> +	if (IS_ERR(host))
>>> +		return PTR_ERR(host);
>>> +
>>> +	pltfm_host = sdhci_priv(host);
>>> +	dev = sdhci_pltfm_priv(pltfm_host);
>>> +	dev->parent = dev_get_drvdata(pdev->dev.parent);
>>> +
>>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +	slot = aspeed_sdhci_calculate_slot(dev, res);
>>> +	if (slot < 0)
>>> +		return slot;
>>> +	dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
>>> +	dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;
>>
>> That implies that you only support 2 slots which begs the question why
>> you don't validate slot.
> 
> I'm not sure what you mean here, but I'll dig into it.

I just meant, if you only support 2 slots:

	if (slot > 1)
		return -EINVAL;

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Re: [PATCH v2 2/2] mmc: Add support for the ASPEED SD controller

[Andrew Jeffery]

On Fri, 26 Jul 2019, at 15:27, Adrian Hunter wrote:
> On 26/07/19 3:52 AM, Andrew Jeffery wrote:
> > On Thu, 25 Jul 2019, at 22:49, Adrian Hunter wrote:
> >> On 12/07/19 6:32 AM, Andrew Jeffery wrote:
> >>> +static int aspeed_sdhci_probe(struct platform_device *pdev)
> >>> +{
> >>> +	struct sdhci_pltfm_host *pltfm_host;
> >>> +	struct aspeed_sdhci *dev;
> >>> +	struct sdhci_host *host;
> >>> +	struct resource *res;
> >>> +	int slot;
> >>> +	int ret;
> >>> +
> >>> +	host = sdhci_pltfm_init(pdev, &aspeed_sdc_pdata, sizeof(*dev));
> >>> +	if (IS_ERR(host))
> >>> +		return PTR_ERR(host);
> >>> +
> >>> +	pltfm_host = sdhci_priv(host);
> >>> +	dev = sdhci_pltfm_priv(pltfm_host);
> >>> +	dev->parent = dev_get_drvdata(pdev->dev.parent);
> >>> +
> >>> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >>> +	slot = aspeed_sdhci_calculate_slot(dev, res);
> >>> +	if (slot < 0)
> >>> +		return slot;
> >>> +	dev_info(&pdev->dev, "Configuring for slot %d\n", slot);
> >>> +	dev->width_mask = !slot ? ASPEED_SDC_S0MMC8 : ASPEED_SDC_S1MMC8;
> >>
> >> That implies that you only support 2 slots which begs the question why
> >> you don't validate slot.
> > 
> > I'm not sure what you mean here, but I'll dig into it.
> 
> I just meant, if you only support 2 slots:
> 
> 	if (slot > 1)
> 		return -EINVAL;
>

Oh, sure.

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