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([80.12.59.101]) by smtp.gmail.com with ESMTPSA id s125sm13149091wms.14.2016.06.06.02.27.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 06 Jun 2016 02:27:04 -0700 (PDT) From: Gabriel Fernandez To: Rob Herring , Mark Rutland , Ian Campbell , Kumar Gala , Srinivas Kandagatla , Maxime Coquelin , Patrice Chotard , Russell King , Michael Turquette , Stephen Boyd , Olivier Bideau , Gabriel Fernandez , Geert Uytterhoeven , Sebastian Hesselbarth , Andrzej Hajda , Pankaj Dev , Dinh Nguyen , Arnd Bergmann , Thierry Reding Subject: [PATCH v2 05/13] drivers: clk: st: Handle clk synchronous mode for video clocks Date: Mon, 6 Jun 2016 11:26:24 +0200 Message-Id: <1465205192-7888-6-git-send-email-gabriel.fernandez@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1465205192-7888-1-git-send-email-gabriel.fernandez@linaro.org> References: <1465205192-7888-1-git-send-email-gabriel.fernandez@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160606_022727_911184_050BB18B X-CRM114-Status: GOOD ( 17.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, kernel@stlinux.com, vincent.abriou@st.com, arnaud.pouliquen@st.com, linux-kernel@vger.kernel.org, gabriel.fernandez@st.com, Peter Griffin , Lee Jones , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, benjamin.gaignard@st.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch configures the semi-synchronous mode of the video clocks of clkgenD2. Signed-off-by: Olivier Bideau Signed-off-by: Gabriel Fernandez --- .../devicetree/bindings/clock/st/st,flexgen.txt | 2 ++ drivers/clk/st/clk-flexgen.c | 37 ++++++++++++++++++++-- 2 files changed, 37 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt index d68f6a5f..7ff77fc 100644 --- a/Documentation/devicetree/bindings/clock/st/st,flexgen.txt +++ b/Documentation/devicetree/bindings/clock/st/st,flexgen.txt @@ -62,6 +62,8 @@ Required properties: "st,flexgen" "st,flexgen-audio", "st,flexgen" (enable clock propagation on parent for audio use case) + "st,flexgen-video", "st,flexgen" (enable clock propagation on parent + and activate synchronous mode) - #clock-cells : from common clock binding; shall be set to 1 (multiple clock outputs). diff --git a/drivers/clk/st/clk-flexgen.c b/drivers/clk/st/clk-flexgen.c index 33d6ced..9878666 100644 --- a/drivers/clk/st/clk-flexgen.c +++ b/drivers/clk/st/clk-flexgen.c @@ -17,6 +17,7 @@ struct clkgen_data { unsigned long flags; + bool mode; }; struct flexgen { @@ -32,9 +33,14 @@ struct flexgen { struct clk_gate fgate; /* Final divisor */ struct clk_divider fdiv; + /* Asynchronous mode control */ + struct clk_gate sync; + /* hw control flags */ + bool control_mode; }; #define to_flexgen(_hw) container_of(_hw, struct flexgen, hw) +#define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw) static int flexgen_enable(struct clk_hw *hw) { @@ -143,12 +149,21 @@ static int flexgen_set_rate(struct clk_hw *hw, unsigned long rate, struct flexgen *flexgen = to_flexgen(hw); struct clk_hw *pdiv_hw = &flexgen->pdiv.hw; struct clk_hw *fdiv_hw = &flexgen->fdiv.hw; + struct clk_hw *sync_hw = &flexgen->sync.hw; + struct clk_gate *config = to_clk_gate(sync_hw); unsigned long div = 0; int ret = 0; + u32 reg; __clk_hw_set_clk(pdiv_hw, hw); __clk_hw_set_clk(fdiv_hw, hw); + if (flexgen->control_mode) { + reg = readl(config->reg); + reg &= ~BIT(config->bit_idx); + writel(reg, config->reg); + } + div = clk_best_div(parent_rate, rate); /* @@ -182,7 +197,7 @@ static const struct clk_ops flexgen_ops = { static struct clk *clk_register_flexgen(const char *name, const char **parent_names, u8 num_parents, void __iomem *reg, spinlock_t *lock, u32 idx, - unsigned long flexgen_flags) { + unsigned long flexgen_flags, bool mode) { struct flexgen *fgxbar; struct clk *clk; struct clk_init_data init; @@ -231,6 +246,13 @@ static struct clk *clk_register_flexgen(const char *name, fgxbar->fdiv.reg = fdiv_reg; fgxbar->fdiv.width = 6; + /* Final divider sync config */ + fgxbar->sync.lock = lock; + fgxbar->sync.reg = fdiv_reg; + fgxbar->sync.bit_idx = 7; + + fgxbar->control_mode = mode; + fgxbar->hw.init = &init; clk = clk_register(NULL, &fgxbar->hw); @@ -267,11 +289,20 @@ static const struct clkgen_data clkgen_audio = { .flags = CLK_SET_RATE_PARENT, }; +static const struct clkgen_data clkgen_video = { + .flags = CLK_SET_RATE_PARENT, + .mode = 1, +}; + static const struct of_device_id flexgen_of_match[] = { { .compatible = "st,flexgen-audio", .data = &clkgen_audio, }, + { + .compatible = "st,flexgen-video", + .data = &clkgen_video, + }, {} }; @@ -287,6 +318,7 @@ static void __init st_of_flexgen_setup(struct device_node *np) struct clkgen_data *data = NULL; unsigned long flex_flags = 0; int ret; + bool clk_mode = 0; pnode = of_get_parent(np); if (!pnode) @@ -304,6 +336,7 @@ static void __init st_of_flexgen_setup(struct device_node *np) if (match) { data = (struct clkgen_data *)match->data; flex_flags = data->flags; + clk_mode = data->mode; } clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL); @@ -345,7 +378,7 @@ static void __init st_of_flexgen_setup(struct device_node *np) continue; clk = clk_register_flexgen(clk_name, parents, num_parents, - reg, rlock, i, flex_flags); + reg, rlock, i, flex_flags, clk_mode); if (IS_ERR(clk)) goto err;