From mboxrd@z Thu Jan 1 00:00:00 1970 From: t-kristo@ti.com (Tero Kristo) Date: Thu, 15 Feb 2018 14:49:49 +0200 Subject: [PATCH 3/5] clk: ti: add generic support for clock latching In-Reply-To: <1518698991-10099-1-git-send-email-t-kristo@ti.com> References: <1518698991-10099-1-git-send-email-t-kristo@ti.com> Message-ID: <1518698991-10099-4-git-send-email-t-kristo@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Certain clocks require latching to be done, so that the actual settings get updated on the HW that generates the clock signal. One example of such a clock is the dra76x GMAC DPLL H14 output, which requires its divider settings to be latched when updated. Signed-off-by: Tero Kristo --- drivers/clk/ti/clk.c | 14 ++++++++++++++ drivers/clk/ti/clock.h | 2 ++ 2 files changed, 16 insertions(+) diff --git a/drivers/clk/ti/clk.c b/drivers/clk/ti/clk.c index 4efa2c9..7d22e1a 100644 --- a/drivers/clk/ti/clk.c +++ b/drivers/clk/ti/clk.c @@ -275,6 +275,20 @@ int ti_clk_get_reg_addr(struct device_node *node, int index, return 0; } +void ti_clk_latch(struct clk_omap_reg *reg, s8 shift) +{ + u32 latch; + + if (shift < 0) + return; + + latch = 1 << shift; + + ti_clk_ll_ops->clk_rmw(latch, latch, reg); + ti_clk_ll_ops->clk_rmw(0, latch, reg); + ti_clk_ll_ops->clk_readl(reg); /* OCP barrier */ +} + /** * omap2_clk_provider_init - init master clock provider * @parent: master node diff --git a/drivers/clk/ti/clock.h b/drivers/clk/ti/clock.h index d9b43bf..2f8af8f 100644 --- a/drivers/clk/ti/clock.h +++ b/drivers/clk/ti/clock.h @@ -194,6 +194,8 @@ struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw, int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con); void ti_clk_add_aliases(void); +void ti_clk_latch(struct clk_omap_reg *reg, s8 shift); + struct clk_hw *ti_clk_build_component_mux(struct ti_clk_mux *setup); int ti_clk_parse_divider_data(int *div_table, int num_dividers, int max_div, -- 1.9.1 -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki