On Wed, 2 Dec 2020 at 19:51, Marcin Wojtas <m...@semihalf.com> wrote:
>
> As a preparation for supporting ACPI, modify the driver
> to use the clk framework only when booting with DT -
> otherwise rely on the configuration done by firmware.
> For that purpose introduce also a custom SDHCI get_max_clock
> callback.
>
> Signed-off-by: Marcin Wojtas <m...@semihalf.com>
> Acked-by: Adrian Hunter <adrian.hun...@intel.com>
> ---
> drivers/mmc/host/sdhci-xenon.c | 61 ++++++++++++--------
> 1 file changed, 38 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
[...]
> @@ -637,10 +650,12 @@ static int xenon_runtime_resume(struct device *dev)
> struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> int ret;
>
> - ret = clk_prepare_enable(pltfm_host->clk);
> - if (ret) {
> - dev_err(dev, "can't enable mainck\n");
> - return ret;
> + if (dev->of_node) {
I didn't notice this in the earlier version, my apologies, but there
is no need for this check.
clk_prepare_enable() should cope fine with a NULL argument - and you
only reach this path, if the clock was successfully fetched during the
probe or that it was left to stay NULL for non-DT case.
> + ret = clk_prepare_enable(pltfm_host->clk);
> + if (ret) {
> + dev_err(dev, "can't enable mainck\n");
> + return ret;
> + }
> }
>
> if (priv->restore_needed) {
> --
> 2.29.0
>
Kind regards
Uffe
