On 2/7/2013 1:27 PM, Manjunathappa, Prakash wrote:
> Adds device tree support for davinci_mmc. Also add binding documentation.
> Tested in non-dma PIO mode and without GPIO card_detect/write_protect
> option because of dependencies on EDMA and GPIO module DT support.
>
> Signed-off-by: Manjunathappa, Prakash <prakash.pm@xxxxxx>
> Cc: linux-mmc@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx
> Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
> Cc: cjb@xxxxxxxxxx
> Cc: Sekhar Nori <nsekhar@xxxxxx>
> Cc: mporter@xxxxxx
> ---
> Since v1:
> Modified DT parse function to take default values and accomodate controller
> version in compatible field.
>
> .../devicetree/bindings/mmc/davinci_mmc.txt | 30 ++++++++
> drivers/mmc/host/davinci_mmc.c | 70 +++++++++++++++++++-
> 2 files changed, 99 insertions(+), 1 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/mmc/davinci_mmc.txt
>
> diff --git a/Documentation/devicetree/bindings/mmc/davinci_mmc.txt b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> new file mode 100644
> index 0000000..6717ab1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/davinci_mmc.txt
> @@ -0,0 +1,30 @@
> +* TI Highspeed MMC host controller for DaVinci
> +
> +The Highspeed MMC Host Controller on TI DaVinci family
> +provides an interface for MMC, SD and SDIO types of memory cards.
> +
> +This file documents the properties used by the davinci_mmc driver.
> +
> +Required properties:
> +- compatible:
> + Should be "ti,davinci-mmc-da830": for da830, da850, dm365
> + Should be "ti,davinci-mmc-dm355": for dm355, dm644x
> +
> +Optional properties:
> +- bus-width: Number of data lines, can be <4>, or <8>, default <1>
> +- max-frequency: Maximum operating clock frequency, default 25MHz.
> +- mmc-cap-mmc-highspeed: Indicates support for MMC in high speed mode
> +- mmc-cap-sd-highspeed: Indicates support for SD in high speed mode
> +
> +Example:
> + mmc0: mmc@1c40000 {
> + compatible = "ti,davinci-mmc-da830",
> + reg = <0x40000 0x1000>;
> + interrupts = <16>;
> + status = "okay";
> + bus-width = <4>;
> + max-frequency = <50000000>;
> + mmc-cap-sd-highspeed;
> + mmc-cap-mmc-highspeed;
> + };
> +
> diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> index 27123f8..3f90316 100644
> --- a/drivers/mmc/host/davinci_mmc.c
> +++ b/drivers/mmc/host/davinci_mmc.c
> @@ -34,6 +34,8 @@
> #include <linux/dma-mapping.h>
> #include <linux/edma.h>
> #include <linux/mmc/mmc.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>
> #include <linux/platform_data/mmc-davinci.h>
>
> @@ -1157,15 +1159,80 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
> mmc_davinci_reset_ctrl(host, 0);
> }
>
> -static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> +static const struct of_device_id davinci_mmc_dt_ids[] = {
> + {
> + .compatible = "ti,davinci-mmc-dm355",
> + .data = (void *)MMC_CTLR_VERSION_1,
> + },
> + {
> + .compatible = "ti,davinci-mmc-da830",
> + .data = (void *)MMC_CTLR_VERSION_2,
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, davinci_mmc_dt_ids);
If you are doing this why not also kill passing IP version through
platform data using a platform_device_id table? Look at what Afzal did
for drivers/rtc/rtc-omap.c
Thanks,
Sekhar
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