linux-kernel - [PATCH v2 4/6] clk: axi-clkgen: Respect ZYNQMP PFD/VCO frequency limits

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Message-ID: <20200810134252.68614-12-alexandru.ardelean@analog.com>
Date:   Mon, 10 Aug 2020 16:42:50 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-clk@...r.kernel.org>, <linux-fpga@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <mturquette@...libre.com>, <sboyd@...nel.org>, <mdf@...nel.org>,
        <ardeleanalex@...il.com>, Mathias Tausen <mta@...space.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v2 4/6] clk: axi-clkgen: Respect ZYNQMP PFD/VCO frequency limits

From: Mathias Tausen <mta@...space.com>

Since axi-clkgen is now supported on ZYNQMP, make sure the max/min
frequencies of the PFD and VCO are respected.

Signed-off-by: Mathias Tausen <mta@...space.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/clk/clk-axi-clkgen.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/clk/clk-axi-clkgen.c b/drivers/clk/clk-axi-clkgen.c
index 14d803e6af62..6ffc19e9d850 100644
--- a/drivers/clk/clk-axi-clkgen.c
+++ b/drivers/clk/clk-axi-clkgen.c
@@ -100,10 +100,17 @@ static uint32_t axi_clkgen_lookup_lock(unsigned int m)
 	return 0x1f1f00fa;
 }
 
+#ifdef ARCH_ZYNQMP
+static const unsigned int fpfd_min = 10000;
+static const unsigned int fpfd_max = 450000;
+static const unsigned int fvco_min = 800000;
+static const unsigned int fvco_max = 1600000;
+#else
 static const unsigned int fpfd_min = 10000;
 static const unsigned int fpfd_max = 300000;
 static const unsigned int fvco_min = 600000;
 static const unsigned int fvco_max = 1200000;
+#endif
 
 static void axi_clkgen_calc_params(unsigned long fin, unsigned long fout,
 	unsigned int *best_d, unsigned int *best_m, unsigned int *best_dout)
-- 
2.17.1