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 <sjg@chromium.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
@ -266,7 +266,7 @@ 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 {
@ -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;
@ -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;
};