From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.4.pengutronix.de ([92.198.50.35]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cadBP-0004hQ-42 for barebox@lists.infradead.org; Mon, 06 Feb 2017 06:53:53 +0000 From: Sascha Hauer Date: Mon, 6 Feb 2017 07:50:50 +0100 Message-Id: <20170206065057.19483-3-s.hauer@pengutronix.de> In-Reply-To: <20170206065057.19483-1-s.hauer@pengutronix.de> References: <20170206065057.19483-1-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/9] clk: implement CLK_OPS_PARENT_ENABLE To: Barebox List Some clocks may only be modified when their parent clocks are enabled. The kernel has the CLK_OPS_PARENT_ENABLE flag for this purpose. Implement it for barebox aswell. Signed-off-by: Sascha Hauer --- drivers/clk/clk.c | 31 +++++++++++++++++++++++++++---- include/linux/clk.h | 2 ++ 2 files changed, 29 insertions(+), 4 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 6f3053727..93e000c6e 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -141,6 +141,7 @@ int clk_set_rate(struct clk *clk, unsigned long rate) { struct clk *parent; unsigned long parent_rate = 0; + int ret; if (!clk) return 0; @@ -148,14 +149,26 @@ int clk_set_rate(struct clk *clk, unsigned long rate) if (IS_ERR(clk)) return PTR_ERR(clk); + if (!clk->ops->set_rate) + return -ENOSYS; + parent = clk_get_parent(clk); - if (parent) + if (parent) { parent_rate = clk_get_rate(parent); - if (clk->ops->set_rate) - return clk->ops->set_rate(clk, rate, parent_rate); + if (clk->flags & CLK_OPS_PARENT_ENABLE) { + ret = clk_enable(parent); + if (ret) + return ret; + } + } + + ret = clk->ops->set_rate(clk, rate, parent_rate); + + if (parent && clk->flags & CLK_OPS_PARENT_ENABLE) + clk_disable(parent); - return -ENOSYS; + return ret; } struct clk *clk_lookup(const char *name) @@ -203,8 +216,18 @@ int clk_set_parent(struct clk *clk, struct clk *newparent) if (clk->enable_count) clk_enable(newparent); + if (clk->flags & CLK_OPS_PARENT_ENABLE) { + clk_enable(curparent); + clk_enable(newparent); + } + ret = clk->ops->set_parent(clk, i); + if (clk->flags & CLK_OPS_PARENT_ENABLE) { + clk_disable(curparent); + clk_disable(newparent); + } + if (clk->enable_count) clk_disable(curparent); diff --git a/include/linux/clk.h b/include/linux/clk.h index 8cb9731f1..697ab4ff4 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -198,6 +198,8 @@ static inline int clk_set_rate(struct clk *clk, unsigned long rate) #ifdef CONFIG_COMMON_CLK #define CLK_SET_RATE_PARENT (1 << 0) /* propagate rate change up one level */ +/* parents need enable during gate/ungate, set rate and re-parent */ +#define CLK_OPS_PARENT_ENABLE (1 << 12) #define CLK_GATE_INVERTED (1 << 0) #define CLK_GATE_HIWORD_MASK (1 << 1) -- 2.11.0 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox