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can: flexcan: add support for PE clock source select 

Add support to select the clock source for CAN Protocol Engine (PE).
It's SoC Implementation dependent. Refer to RM for detailed definition
of each SoC. We select clock source 1 (peripheral clock) by default in
driver now, this patch adds support to parse the clock source from the DT.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Dong Aisheng 2018-12-13 07:08:00 +00:00 committed by Marc Kleine-Budde
parent 9d73399277
commit 8c306bec2d
1 changed files with 12 additions and 2 deletions
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14
drivers/net/can/flexcan.c
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@ -275,6 +275,8 @@ struct flexcan_priv {
u8 tx_mb_idx;
u8 mb_count;
u8 mb_size;
u8 clk_src; /* clock source of CAN Protocol Engine */
u32 reg_ctrl_default;
u32 reg_imask1_default;
u32 reg_imask2_default;
@ -1369,7 +1371,10 @@ static int register_flexcandev(struct net_device *dev)
goto out_clks_disable;
reg = priv->read(&regs->ctrl);
reg |= FLEXCAN_CTRL_CLK_SRC;
if (priv->clk_src)
reg |= FLEXCAN_CTRL_CLK_SRC;
else
reg &= ~FLEXCAN_CTRL_CLK_SRC;
priv->write(reg, &regs->ctrl);
err = flexcan_chip_enable(priv);
@ -1501,6 +1506,7 @@ static int flexcan_probe(struct platform_device *pdev)
struct clk *clk_ipg = NULL, *clk_per = NULL;
struct flexcan_regs __iomem *regs;
int err, irq;
u8 clk_src = 1;
u32 clock_freq = 0;
reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver");
@ -1509,9 +1515,12 @@ static int flexcan_probe(struct platform_device *pdev)
else if (IS_ERR(reg_xceiver))
reg_xceiver = NULL;
if (pdev->dev.of_node)
if (pdev->dev.of_node) {
of_property_read_u32(pdev->dev.of_node,
"clock-frequency", &clock_freq);
of_property_read_u8(pdev->dev.of_node,
"fsl,clk-source", &clk_src);
}
if (!clock_freq) {
clk_ipg = devm_clk_get(&pdev->dev, "ipg");
@ -1580,6 +1589,7 @@ static int flexcan_probe(struct platform_device *pdev)
priv->regs = regs;
priv->clk_ipg = clk_ipg;
priv->clk_per = clk_per;
priv->clk_src = clk_src;
priv->devtype_data = devtype_data;
priv->reg_xceiver = reg_xceiver;