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SubjectRe: [PATCH 1/2] sdhci/tegra: Add Device Tree probing support
Date
Hi,

just a small question,

> From: Grant Likely <grant.likely@secretlab.ca>

[...]

> diff --git a/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt new file mode
> 100644
> index 0000000..c87f667
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
> @@ -0,0 +1,25 @@
> +* NVIDIA Tegra Secure Digital Host Controller
> +
> +This controller on Tegra family SoCs provides an interface for MMC, SD,
> +and SDIO types of memory cards.
> +
> +Required properties:
> +- compatible : Should be "nvidia,<chip>-sdhci"
> +- reg : Should contain eSDHC registers location and length
> +- interrupts : Should contain eSDHC interrupt
> +
> +Optional properties:
> +- cd-gpios : Specify GPIOs for card detection
> +- wp-gpios : Specify GPIOs for write protection
> +- power-gpios : Specify GPIOs for power control
> +
> +Example:
> +
> +sdhci@c8000200 {
> + compatible = "nvidia,tegra20-sdhci";
> + reg = <0xc8000200 0x200>;
> + interrupts = <47>;
> + cd-gpios = <&gpio 69 0>; /* gpio PI5 */
> + wp-gpios = <&gpio 57 0>; /* gpio PH1 */
> + power-gpios = <&gpio 155 0>; /* gpio PT3 */
> +};
> diff --git a/drivers/mmc/host/sdhci-tegra.c
> b/drivers/mmc/host/sdhci-tegra.c index a5a9a97..9ab18d6 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -17,6 +17,7 @@
> #include <linux/platform_device.h>
> #include <linux/clk.h>
> #include <linux/io.h>
> +#include <linux/of_gpio.h>
> #include <linux/gpio.h>
> #include <linux/mmc/card.h>
> #include <linux/mmc/host.h>
> @@ -74,10 +75,8 @@ static void tegra_sdhci_writel(struct sdhci_host *host,
> u32 val, int reg)
>
> static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
> {
> - struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
> - struct tegra_sdhci_platform_data *plat;
> -
> - plat = pdev->dev.platform_data;
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
> + struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
>
> if (!gpio_is_valid(plat->wp_gpio))
> return -1;
> @@ -95,12 +94,10 @@ static irqreturn_t carddetect_irq(int irq, void *data)
>
> static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
> {
> - struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
> - struct tegra_sdhci_platform_data *plat;
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
> u32 ctrl;
>
> - plat = pdev->dev.platform_data;
> -
> ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
> ctrl &= ~SDHCI_CTRL_4BITBUS;

what about 8 bit support?

> @@ -132,6 +129,34 @@ static struct sdhci_pltfm_data sdhci_tegra_pdata = {
> .ops = &tegra_sdhci_ops,
> };
>
> +static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
> + { .compatible = "nvidia,tegra20-sdhci", },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
> +
> +static struct tegra_sdhci_platform_data * __devinit
> sdhci_tegra_dt_parse_pdata( + struct platform_device *pdev)
> +{
> + struct tegra_sdhci_platform_data *plat;
> + struct device_node *np = pdev->dev.of_node;
> +
> + if (!np)
> + return NULL;
> +
> + plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
> + if (!plat) {
> + dev_err(&pdev->dev, "Can't allocate platform data\n");
> + return NULL;
> + }
> +
> + plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
> + plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
> + plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
> +
> + return plat;
> +}

[...]


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