[U-Boot] [PATCH] mmc: socfpga: Add clock framework support

[Ley Foon Tan <ley.foon.tan@intel.com>]

On Wed, 2018-08-08 at 22:12 +0200, Marek Vasut wrote:
> Add support for fetching the clock frequency both using the legacy
> method in case clock framework is disabled as well as via the clock
> framework if it is enabled. This allows for migration to the clock
> framework on platforms which supports it while not breaking legacy
> platforms. That said, the legacy method must be removed eventually.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Chin Liang See <chin.liang.see@intel.com>
> Cc: Dinh Nguyen <dinguyen@kernel.org>
> Cc: Ley Foon Tan <ley.foon.tan@intel.com>
> ---
>  drivers/mmc/socfpga_dw_mmc.c | 40 +++++++++++++++++++++++++++++++---
> ------
>  1 file changed, 31 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mmc/socfpga_dw_mmc.c
> b/drivers/mmc/socfpga_dw_mmc.c
> index ed8ba10c93..739c1629a2 100644
> --- a/drivers/mmc/socfpga_dw_mmc.c
> +++ b/drivers/mmc/socfpga_dw_mmc.c
> @@ -6,6 +6,7 @@
>  #include <common.h>
>  #include <asm/arch/clock_manager.h>
>  #include <asm/arch/system_manager.h>
> +#include <clk.h>
>  #include <dm.h>
>  #include <dwmmc.h>
>  #include <errno.h>
> @@ -70,20 +71,39 @@ static void socfpga_dwmci_clksel(struct
> dwmci_host *host)
>  		CLKMGR_PERPLLGRP_EN_SDMMCCLK_MASK);
>  }
>  
> -static int socfpga_dwmmc_ofdata_to_platdata(struct udevice *dev)
> +static int socfpga_dwmmc_get_clk_rate(struct udevice *dev)
>  {
> -	/* FIXME: probe from DT eventually too/ */
> -	const unsigned long clk = cm_get_mmc_controller_clk_hz();
> -
>  	struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
>  	struct dwmci_host *host = &priv->host;
> -	int fifo_depth;
> +#if CONFIG_IS_ENABLED(CLK)
> +	struct clk clk;
> +	int ret;
> +
> +	ret = clk_get_by_index(dev, 1, &clk);
> +	if (ret)
> +		return ret;
>  
> -	if (clk == 0) {
> +	host->bus_hz = clk_get_rate(&clk);
> +
> +	clk_free(&clk);
> +#else
> +	/* Fixed clock divide by 4 which due to the SDMMC wrapper */
> +	host->bus_hz = cm_get_mmc_controller_clk_hz();
> +#endif
> +	if (host->bus_hz == 0) {
>  		printf("DWMMC: MMC clock is zero!");
>  		return -EINVAL;
>  	}
>  
> +	return 0;
> +}
> +
> +static int socfpga_dwmmc_ofdata_to_platdata(struct udevice *dev)
> +{
> +	struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
> +	struct dwmci_host *host = &priv->host;
> +	int fifo_depth;
> +
>  	fifo_depth = fdtdec_get_int(gd->fdt_blob,
> dev_of_offset(dev),
>  				    "fifo-depth", 0);
>  	if (fifo_depth < 0) {
> @@ -102,8 +122,6 @@ static int
> socfpga_dwmmc_ofdata_to_platdata(struct udevice *dev)
>  	 * We only have one dwmmc block on gen5 SoCFPGA.
>  	 */
>  	host->dev_index = 0;
> -	/* Fixed clock divide by 4 which due to the SDMMC wrapper */
> -	host->bus_hz = clk;
>  	host->fifoth_val = MSIZE(0x2) |
>  		RX_WMARK(fifo_depth / 2 - 1) | TX_WMARK(fifo_depth /
> 2);
>  	priv->drvsel = fdtdec_get_uint(gd->fdt_blob,
> dev_of_offset(dev),
> @@ -123,6 +141,11 @@ static int socfpga_dwmmc_probe(struct udevice
> *dev)
>  	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
>  	struct dwmci_socfpga_priv_data *priv = dev_get_priv(dev);
>  	struct dwmci_host *host = &priv->host;
> +	int ret;
> +
> +	ret = socfpga_dwmmc_get_clk_rate(dev);
> +	if (ret)
> +		return ret;
>  
>  	socfpga_dwmci_reset(dev);
>  

> @@ -130,7 +153,6 @@ static int socfpga_dwmmc_probe(struct udevice
> *dev)
>  	dwmci_setup_cfg(&plat->cfg, host, host->bus_hz, 400000);
>  	host->mmc = &plat->mmc;
>  #else
> -	int ret;
>  
>  	ret = add_dwmci(host, host->bus_hz, 400000);
>  	if (ret)

Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>