| Message ID | 1557036830-13567-1-git-send-email-Anson.Huang@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/2] clk: imx: Add common API for masking MMDC handshake | expand |
> From: Anson Huang > Sent: Sunday, May 5, 2019 2:19 PM > Subject: [PATCH 1/2] 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> Regards Dong Aisheng
diff --git a/drivers/clk/imx/clk.c b/drivers/clk/imx/clk.c index 1efed86..6f9bcee 100644 --- a/drivers/clk/imx/clk.c +++ b/drivers/clk/imx/clk.c @@ -6,8 +6,22 @@ #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; diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h index 8639a8f..6dcdc91 100644 --- a/drivers/clk/imx/clk.h +++ b/drivers/clk/imx/clk.h @@ -10,6 +10,7 @@ extern spinlock_t imx_ccm_lock; void imx_check_clocks(struct clk *clks[], unsigned int count); void imx_check_clk_hws(struct clk_hw *clks[], unsigned int count); void imx_register_uart_clocks(struct clk ** const clks[]); +void imx_mmdc_mask_handshake(void __iomem *ccm_base, unsigned int chn); extern void imx_cscmr1_fixup(u32 *val);
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> --- drivers/clk/imx/clk.c | 14 ++++++++++++++ drivers/clk/imx/clk.h | 1 + 2 files changed, 15 insertions(+)