[U-Boot] [PATCH V2] fsl: esdhc: support driver model

[york sun <york.sun@nxp.com>]

On 03/15/2016 03:23 AM, Peng Fan wrote:
> Support Driver Model for fsl esdhc driver.
> 
> 1. Introduce a new structure struct fsl_esdhc_priv
> 2. Refactor fsl_esdhc_initialize which is originally used by board code.
>    - Introduce fsl_esdhc_init to be common usage for DM and non-DM
>    - Introduce fsl_esdhc_cfg_to_priv to build the bridge for non-DM part.
>    - The original API for board code is still there, but we use
>      'fsl_esdhc_cfg_to_priv' and 'fsl_esdhc_init' to serve it.
> 3. All the functions are changed to use 'struct fsl_esdhc_priv', except
>    fsl_esdhc_initialize.
> 4. Since clk driver is not implemented, use mxc_get_clock to geth
>    the clk and fill 'priv->sdhc_clk'.
> 
> Has been tested on i.MX6UL 14X14 EVK board:
> "
> =>dm tree
> ....
>  simple_bus  [ + ]    |   `-- aips-bus at 02100000
>   mmc        [ + ]    |       |-- usdhc at 02190000
>   mmc        [ + ]    |       |-- usdhc at 02194000
> ....
> => mmc list
> FSL_SDHC: 0 (SD)
> FSL_SDHC: 1 (SD)
> "
> 
> Signed-off-by: Peng Fan <van.freenix@gmail.com>
> Cc: York Sun <york.sun@nxp.com>
> Cc: Yangbo Lu <yangbo.lu@nxp.com>
> Cc: Hector Palacios <hector.palacios@digi.com>
> Cc: Eric Nelson <eric@nelint.com>
> Cc: Stefano Babic <sbabic@denx.de>
> Cc: Fabio Estevam <fabio.estevam@nxp.com>
> Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
> Cc: Simon Glass <sjg@chromium.org>
> ---
> 
> V2:
>  restructure the V1 patch.
>  Introduce fsl_esdhc_priv structure.
>  Introduce code to handle cd-gpios and non-removable.
> 
>  drivers/mmc/fsl_esdhc.c | 253 ++++++++++++++++++++++++++++++++++++++++--------
>  1 file changed, 213 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
> index ea5f4bf..6fadde1 100644
> --- a/drivers/mmc/fsl_esdhc.c
> +++ b/drivers/mmc/fsl_esdhc.c
> @@ -20,6 +20,9 @@

<snip>

> +static int fsl_esdhc_probe(struct udevice *dev)
> +{
> +	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
> +	struct fsl_esdhc_priv *priv = dev_get_priv(dev);
> +	const void *fdt = gd->fdt_blob;
> +	int node = dev->of_offset;
> +	fdt_addr_t addr;
> +	unsigned int val;
> +	int ret;
> +
> +	addr = dev_get_addr(dev);
> +	if (addr == FDT_ADDR_T_NONE)
> +		return -EINVAL;
> +
> +	priv->esdhc_base = (phys_addr_t)addr;
> +	priv->dev = dev;
> +
> +	val = fdtdec_get_int(fdt, node, "bus-width", -1);
> +	if (val == 8)
> +		priv->bus_width = 8;
> +	else if (val == 4)
> +		priv->bus_width = 4;
> +	else
> +		priv->bus_width = 1;
> +
> +	if (fdt_get_property(fdt, node, "non-removable", NULL)) {
> +		priv->non_removable = 1;
> +	 } else {
> +		priv->non_removable = 0;
> +		gpio_request_by_name_nodev(fdt, node, "cd-gpios", 0,
> +					   &priv->cd_gpio, GPIOD_IS_IN);
> +	}
> +
> +	/*
> +	 * TODO:
> +	 * Because lack of clk driver, if SDHC clk is not enabled,
> +	 * need to enable it first before this driver is invoked.
> +	 *
> +	 * we use MXC_ESDHC_CLK to get clk freq.
> +	 * If one would like to make this function work,
> +	 * the aliases should be provided in dts as this:
> +	 *
> +	 *  aliases {
> +	 *	mmc0 = &usdhc1;
> +	 *	mmc1 = &usdhc2;
> +	 *	mmc2 = &usdhc3;
> +	 *	mmc3 = &usdhc4;
> +	 *	};
> +	 * Then if your board only supports mmc2 and mmc3, but we can
> +	 * correctly get the seq as 2 and 3, then let mxc_get_clock
> +	 * work as expected.
> +	 */
> +	priv->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK + dev->seq);

Peng,

This seems to be problematic on powerpc platforms. Have you tested (at least
compiled) for any of them (eg. T2080, T4240, P1022, MPC8536, etc.)?

York