diff options
| author | Anson Huang <anson.huang@nxp.com> | 2019-05-12 10:24:12 +0000 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-05-23 21:14:41 +0800 |
| commit | efdb279033ad4fa830e330a071d1e434235aa153 (patch) | |
| tree | a124e488185150db57b3d341613801ed49137ffb /drivers/clk/imx/clk.c | |
| parent | 53c6a2ec018bb07aeb1e2b1d7db8521f1e56d221 (diff) | |
| download | linux-efdb279033ad4fa830e330a071d1e434235aa153.tar.bz2 | |
clk: imx: Add common API for masking MMDC handshake
All i.MX6 SoCs need to mask unused MMDC channel's handshake
for low power modes, this patch provides common API for masking
the MMDC channel passed from caller.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/clk/imx/clk.c')
| -rw-r--r-- | drivers/clk/imx/clk.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c index 1efed86217f7..9cd709787ea6 100644 --- a/drivers/clk/imx/clk.c +++ b/drivers/clk/imx/clk.c @@ -1,13 +1,28 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/clk.h> #include <linux/err.h> +#include <linux/io.h> #include <linux/of.h> #include <linux/slab.h> #include <linux/spinlock.h> #include "clk.h" +#define CCM_CCDR 0x4 +#define CCDR_MMDC_CH0_MASK BIT(17) +#define CCDR_MMDC_CH1_MASK BIT(16) + DEFINE_SPINLOCK(imx_ccm_lock); +void __init imx_mmdc_mask_handshake(void __iomem *ccm_base, + unsigned int chn) +{ + unsigned int reg; + + reg = readl_relaxed(ccm_base + CCM_CCDR); + reg |= chn == 0 ? CCDR_MMDC_CH0_MASK : CCDR_MMDC_CH1_MASK; + writel_relaxed(reg, ccm_base + CCM_CCDR); +} + void __init imx_check_clocks(struct clk *clks[], unsigned int count) { unsigned i; |