From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: [PATCH] clk-rcar-gen2: ADSP clock support Date: Fri, 26 Dec 2014 01:55:26 +0300 Message-ID: <2616097.6QI9oiZ0Bl@wasted.cogentembedded.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: Sender: linux-sh-owner@vger.kernel.org To: mturquette@linaro.org, linux-kernel@vger.kernel.org, sboyd@codeaurora.org, robh+dt@kernel.org Cc: linux-sh@vger.kernel.org, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org Add the ADSP clock support to the R-Car generation 2 CPG driver. This clock gets derived from PLL1. The layout of the ADSPCKCR register is similar to those of the clocks supported by the 'clk-div6' driver but the divider encoding is non-linear, so can't be supported by that driver... Based on the original patch by Konstantin Kozhevnikov . Signed-off-by: Sergei Shtylyov --- The patch is against the 'clk-next' branch of Mike Turquette's 'linux.git' repo plus the RCAN clock support posted yesterday. Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt | 5 - drivers/clk/shmobile/clk-rcar-gen2.c | 48 ++++++++++ 2 files changed, 51 insertions(+), 2 deletions(-) Index: linux/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt =================================================================== --- linux.orig/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt +++ linux/Documentation/devicetree/bindings/clock/renesas,rcar-gen2-cpg-clocks.txt @@ -16,7 +16,8 @@ Required Properties: - clocks: Reference to the parent clock - #clock-cells: Must be 1 - clock-output-names: The names of the clocks. Supported clocks are "main", - "pll0", "pll1", "pll3", "lb", "qspi", "sdh", "sd0", "sd1", "z", and "rcan" + "pll0", "pll1", "pll3", "lb", "qspi", "sdh", "sd0", "sd1", "z", "adsp", and + "rcan" Example @@ -30,5 +31,5 @@ Example #clock-cells = <1>; clock-output-names = "main", "pll0, "pll1", "pll3", "lb", "qspi", "sdh", "sd0", "sd1", "z", - "rcan"; + "adsp", "rcan"; }; Index: linux/drivers/clk/shmobile/clk-rcar-gen2.c =================================================================== --- linux.orig/drivers/clk/shmobile/clk-rcar-gen2.c +++ linux/drivers/clk/shmobile/clk-rcar-gen2.c @@ -33,6 +33,7 @@ struct rcar_gen2_cpg { #define CPG_FRQCRC 0x000000e0 #define CPG_FRQCRC_ZFC_MASK (0x1f << 8) #define CPG_FRQCRC_ZFC_SHIFT 8 +#define CPG_ADSPCKCR 0x0000025c #define CPG_RCANCKCR 0x00000270 /* ----------------------------------------------------------------------------- @@ -162,6 +163,51 @@ static struct clk * __init cpg_z_clk_reg return clk; } +/* ADSP divisors */ +static const struct clk_div_table cpg_adsp_div_table[] = { + { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, + { 5, 12 }, { 6, 16 }, { 7, 18 }, { 8, 24 }, + { 10, 36 }, { 11, 48 }, { 0, 0 }, +}; + +static struct clk * __init cpg_adsp_clk_register(struct rcar_gen2_cpg *cpg) +{ + const char *parent_name = "pll1"; + struct clk_divider *div; + struct clk_gate *gate; + struct clk *clk; + + div = kzalloc(sizeof(*div), GFP_KERNEL); + if (!div) + return ERR_PTR(-ENOMEM); + + div->reg = cpg->reg + CPG_ADSPCKCR; + div->width = 4; + div->table = cpg_adsp_div_table; + div->lock = &cpg->lock; + + gate = kzalloc(sizeof(*gate), GFP_KERNEL); + if (!gate) { + kfree(div); + return ERR_PTR(-ENOMEM); + } + + gate->reg = cpg->reg + CPG_RCANCKCR; + gate->bit_idx = 8; + gate->flags = CLK_GATE_SET_TO_DISABLE; + gate->lock = &cpg->lock; + + clk = clk_register_composite(NULL, "adsp", &parent_name, 1, NULL, NULL, + &div->hw, &clk_divider_ops, + &gate->hw, &clk_gate_ops, 0); + if (IS_ERR(clk)) { + kfree(gate); + kfree(div); + } + + return clk; +} + static struct clk * __init cpg_rcan_clk_register(struct rcar_gen2_cpg *cpg, struct device_node *np) { @@ -301,6 +347,8 @@ rcar_gen2_cpg_register_clock(struct devi shift = 0; } else if (!strcmp(name, "z")) { return cpg_z_clk_register(cpg); + } else if (!strcmp(name, "adsp")) { + return cpg_adsp_clk_register(cpg); } else if (!strcmp(name, "rcan")) { return cpg_rcan_clk_register(cpg, np); } else {