linux-kernel - [PATCH 05/22] clk: sunxi: Fix gate indexing for sun6i-a31-apb0-gates

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Message-Id: <1400831485-28576-6-git-send-email-wens@csie.org>
Date:	Fri, 23 May 2014 15:51:08 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Linus Walleij <linus.walleij@...aro.org>
Cc:	Chen-Yu Tsai <wens@...e.org>, linux-serial@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Luc Verhaegen <libv@...net.be>
Subject: [PATCH 05/22] clk: sunxi: Fix gate indexing for sun6i-a31-apb0-gates

sun6i-a31-apb0-gates supports using clock-indices for holes between
individual gates. However, the driver passes the number of gates
registered in clk_data->clk_num, which of_clk_src_onecell_get uses
to recognize the range of valid indices a consumer can use.

This patch makes the driver pass the maximum gate index + 1, so
of_clk_src_onecell_get does not complain about indices greater
than gates registered.

This was tested on the A23 SoC, which has a similar APB0 clock,
but has holes for gates to removed IP blocks.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 drivers/clk/sunxi/clk-sun6i-apb0-gates.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/sunxi/clk-sun6i-apb0-gates.c b/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
index 44cd27c..b342f2a 100644
--- a/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
+++ b/drivers/clk/sunxi/clk-sun6i-apb0-gates.c
@@ -25,6 +25,7 @@ static int sun6i_a31_apb0_gates_clk_probe(struct platform_device *pdev)
 	void __iomem *reg;
 	int gate_id;
 	int ngates;
+	int gate_max = 0;
 	int i;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -72,9 +73,12 @@ static int sun6i_a31_apb0_gates_clk_probe(struct platform_device *pdev)
 							    reg, gate_id,
 							    0, NULL);
 		WARN_ON(IS_ERR(clk_data->clks[gate_id]));
+
+		if (gate_id > gate_max)
+			gate_max = gate_id;
 	}
 
-	clk_data->clk_num = ngates;
+	clk_data->clk_num = gate_max + 1;
 
 	return of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
 }
-- 
2.0.0.rc2

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