Hi Simon, > On Aug 7, 2015, at 05:16 , Simon Glass <s...@chromium.org> wrote: > > Some SoCs want to adjust the input clock to the DWMMC block as a way of > controlling the MMC bus clock. Update the get_mmc_clk() method to support > this. > > Signed-off-by: Simon Glass <s...@chromium.org> > --- > > Changes in v4: > - Update commit message to indicate this patch is for the dw_mmc driver > > drivers/mmc/dw_mmc.c | 2 +- > drivers/mmc/exynos_dw_mmc.c | 2 +- > include/dwmmc.h | 16 +++++++++++++++- > 3 files changed, 17 insertions(+), 3 deletions(-) > > diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c > index 8f28d7e..a034c3f 100644 > --- a/drivers/mmc/dw_mmc.c > +++ b/drivers/mmc/dw_mmc.c > @@ -248,7 +248,7 @@ static int dwmci_setup_bus(struct dwmci_host *host, u32 > freq) > * host->bus_hz should be set by user. > */ > if (host->get_mmc_clk) > - sclk = host->get_mmc_clk(host); > + sclk = host->get_mmc_clk(host, freq); > else if (host->bus_hz) > sclk = host->bus_hz; > else { > diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c > index e083745..3f702ba 100644 > --- a/drivers/mmc/exynos_dw_mmc.c > +++ b/drivers/mmc/exynos_dw_mmc.c > @@ -39,7 +39,7 @@ static void exynos_dwmci_clksel(struct dwmci_host *host) > dwmci_writel(host, DWMCI_CLKSEL, priv->sdr_timing); > } > > -unsigned int exynos_dwmci_get_clk(struct dwmci_host *host) > +unsigned int exynos_dwmci_get_clk(struct dwmci_host *host, uint freq) > { > unsigned long sclk; > int8_t clk_div; > diff --git a/include/dwmmc.h b/include/dwmmc.h > index 7a7555a..25cf42c 100644 > --- a/include/dwmmc.h > +++ b/include/dwmmc.h > @@ -163,7 +163,21 @@ struct dwmci_host { > > void (*clksel)(struct dwmci_host *host); > void (*board_init)(struct dwmci_host *host); > - unsigned int (*get_mmc_clk)(struct dwmci_host *host); > + > + /** > + * Get / set a particular MMC clock frequency > + * > + * This is used to request the current clock frequency of the clock > + * that drives the DWMMC peripheral. The caller will then use this > + * information to work out the divider it needs to achieve the > + * required MMC bus clock frequency. If you want to handle the > + * clock external to DWMMC, use @freq to select the frequency and > + * return that value too. Then DWMMC will put itself in bypass mode. > + * > + * @host: DWMMC host > + * @freq: Frequency the host is trying to achieve > + */ > + unsigned int (*get_mmc_clk)(struct dwmci_host *host, uint freq); > > struct mmc_config cfg; > }; > -- > 2.5.0.rc2.392.g76e840b
I’m applying this now. It makes sense. No, we don’t have a clock framework for now so this will do. Thanks — Pantelis _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot