On Tue, May 19, 2015 at 02:36:46PM +0800, Chaotian Jing wrote:
> Add Mediatek MMC driver code
> Support eMMC/SD/SDIO
>
> Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
> ---
> drivers/mmc/host/Kconfig | 8 +
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/mtk-sd.c | 1422 +++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1431 insertions(+)
> create mode 100644 drivers/mmc/host/mtk-sd.c
>
> +
> + host->src_clk = devm_clk_get(&pdev->dev, "source");
> + if (IS_ERR(host->src_clk)) {
> + ret = PTR_ERR(host->src_clk);
> + goto host_free;
> + }
> +
> + host->h_clk = devm_clk_get(&pdev->dev, "hclk");
> + if (IS_ERR(host->h_clk)) {
> + /* host->h_clk is optional, Only for MSDC0/3 at MT8173 */
> + dev_dbg(&pdev->dev,
> + "Invalied hclk from the device tree!\n");
> + }
s/Invalied/Invalid/
According to my reference manual the controller always needs a hclk. It
seems on some controllers it is just not software controllable. If
that's the case you should always provide a hclk to the driver and make
this clock mandatory.
Sascha
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