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mmc: sunxi: Use devm_reset_control_get_optional() for reset control 

The reset control for the sunxi mmc controller is optional. Some
newer platforms (sun6i, sun8i, sun9i) have it, while older ones
(sun4i, sun5i, sun7i) don't.

Use the properly stubbed _optional version so the driver does not
fail to compile when RESET_CONTROLLER=n.

This patch also adds a check for deferred probing on the reset
control.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Cc: <stable@vger.kernel.org> # 3.16+
Acked-by: David Lanzendörfer <david.lanzendoerfer@o2s.ch>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chen-Yu Tsai 2015-03-03 09:44:40 +08:00 committed by Ulf Hansson
parent caebcae94f
commit 9e71c589e4
1 changed files with 3 additions and 1 deletions
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4
drivers/mmc/host/sunxi-mmc.c
View File

@ -930,7 +930,9 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
return PTR_ERR(host->clk_sample);
}
host->reset = devm_reset_control_get(&pdev->dev, "ahb");
host->reset = devm_reset_control_get_optional(&pdev->dev, "ahb");
if (PTR_ERR(host->reset) == -EPROBE_DEFER)
return PTR_ERR(host->reset);
ret = clk_prepare_enable(host->clk_ahb);
if (ret) {