From 7ab64628bb4ab139aea9f1238ce6f945be580773 Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Tue, 11 Aug 2015 13:32:56 +0800 Subject: crypto: sunxi-ss - Add optional reset control support On sun6i and later platforms, the reset control is split out of the clock gates. Add support for an optional reset control. Signed-off-by: Chen-Yu Tsai Signed-off-by: Herbert Xu --- drivers/crypto/sunxi-ss/sun4i-ss-core.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/crypto/sunxi-ss/sun4i-ss-core.c') diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-core.c b/drivers/crypto/sunxi-ss/sun4i-ss-core.c index 0b79b58c913b..eab6fe227fa0 100644 --- a/drivers/crypto/sunxi-ss/sun4i-ss-core.c +++ b/drivers/crypto/sunxi-ss/sun4i-ss-core.c @@ -22,6 +22,7 @@ #include #include #include +#include #include "sun4i-ss.h" @@ -253,6 +254,14 @@ static int sun4i_ss_probe(struct platform_device *pdev) } dev_dbg(&pdev->dev, "clock ahb_ss acquired\n"); + ss->reset = devm_reset_control_get_optional(&pdev->dev, "ahb"); + if (IS_ERR(ss->reset)) { + if (PTR_ERR(ss->reset) == -EPROBE_DEFER) + return PTR_ERR(ss->reset); + dev_info(&pdev->dev, "no reset control found\n"); + ss->reset = NULL; + } + /* Enable both clocks */ err = clk_prepare_enable(ss->busclk); if (err != 0) { @@ -275,6 +284,15 @@ static int sun4i_ss_probe(struct platform_device *pdev) goto error_clk; } + /* Deassert reset if we have a reset control */ + if (ss->reset) { + err = reset_control_deassert(ss->reset); + if (err) { + dev_err(&pdev->dev, "Cannot deassert reset control\n"); + goto error_clk; + } + } + /* * The only impact on clocks below requirement are bad performance, * so do not print "errors" @@ -352,6 +370,8 @@ error_alg: break; } } + if (ss->reset) + reset_control_assert(ss->reset); error_clk: clk_disable_unprepare(ss->ssclk); error_ssclk: @@ -376,6 +396,8 @@ static int sun4i_ss_remove(struct platform_device *pdev) } writel(0, ss->base + SS_CTL); + if (ss->reset) + reset_control_assert(ss->reset); clk_disable_unprepare(ss->busclk); clk_disable_unprepare(ss->ssclk); return 0; -- cgit v1.2.1